Pub Date : 2023-11-02DOI: 10.1080/15732479.2023.2275684
Yazhou Qin
AbstractThis study aims to accurately and effectively investigate the instantaneous frequency (IF) of the monitored acceleration of the bridge, as well as the individual components of the monitored signal, using advanced time-frequency techniques. To achieve this, first, synthetic signals resembling the monitored acceleration are constructed and processed using four time-frequency techniques. The accuracy of IF tracking, signal reconstruction, and representation resolution are obtained and compared between these different time-frequency techniques. Subsequently, the monitored vertical and torsional accelerations from the Humber Bridge are analysed using the Fourier synchrosqueezed transform and the improved multisynchrosqueezing transform. This allows for the reconstruction of individual acceleration components along with the corresponding variation of the natural frequency. The magnitude of each component of the monitored acceleration is then obtained. The relative importance of modes in the monitored acceleration is evaluated based on the acceleration root mean square. This study presents a novel approach that involves reconstructing the monitored acceleration and assessing the magnitude of individual components of the monitored data of the bridge under operational conditions using the advanced time-frequency method. The method is particularly suitable for addressing multicomponent monitored data and is expected to benefit future practical research in the bridge health monitoring field.Keywords: Time-frequency analysisreconstruction of accelerationinstantaneous frequency trackingresolution of representationroot mean squareoperational conditionssynchrosqueezed transform AcknowledgementsThe author expresses his gratitude to Dr. Ki Young Koo at the University of Exeter for providing the monitored data and contributing to the code.Disclosure statementThe author reports there are no competing interests to declare.
摘要本研究旨在利用先进的时频技术，准确有效地研究桥梁加速度监测的瞬时频率(IF)，以及监测信号的各个分量。为了实现这一目标，首先，利用四种时频技术构建和处理与监测加速度相似的合成信号。对不同时频技术的中频跟踪精度、信号重建精度和表示分辨率进行了比较。随后，利用傅里叶同步压缩变换和改进的多同步压缩变换对亨伯桥监测到的垂直加速度和扭转加速度进行了分析。这允许重建单个加速度分量以及相应的固有频率变化。然后得到被监测加速度的每个分量的大小。基于加速度均方根，评价了各模态在加速度监测中的相对重要性。本研究提出了一种新的方法，包括重建监测的加速度，并使用先进的时频法评估桥梁在运行条件下监测数据的各个分量的大小。该方法特别适用于处理多组分监测数据，有望为未来桥梁健康监测领域的实际研究带来益处。关键词:时频分析、加速度重建、瞬时频率跟踪、表示分辨率、均方根、运行条件、同步压缩变换感谢英国埃克塞特大学的Ki Young Koo博士提供的监测数据和编写的代码。披露声明作者报告无竞争利益需要申报。
{"title":"Investigating bridge vibrational modes under operational conditions using time-frequency analysis","authors":"Yazhou Qin","doi":"10.1080/15732479.2023.2275684","DOIUrl":"https://doi.org/10.1080/15732479.2023.2275684","url":null,"abstract":"AbstractThis study aims to accurately and effectively investigate the instantaneous frequency (IF) of the monitored acceleration of the bridge, as well as the individual components of the monitored signal, using advanced time-frequency techniques. To achieve this, first, synthetic signals resembling the monitored acceleration are constructed and processed using four time-frequency techniques. The accuracy of IF tracking, signal reconstruction, and representation resolution are obtained and compared between these different time-frequency techniques. Subsequently, the monitored vertical and torsional accelerations from the Humber Bridge are analysed using the Fourier synchrosqueezed transform and the improved multisynchrosqueezing transform. This allows for the reconstruction of individual acceleration components along with the corresponding variation of the natural frequency. The magnitude of each component of the monitored acceleration is then obtained. The relative importance of modes in the monitored acceleration is evaluated based on the acceleration root mean square. This study presents a novel approach that involves reconstructing the monitored acceleration and assessing the magnitude of individual components of the monitored data of the bridge under operational conditions using the advanced time-frequency method. The method is particularly suitable for addressing multicomponent monitored data and is expected to benefit future practical research in the bridge health monitoring field.Keywords: Time-frequency analysisreconstruction of accelerationinstantaneous frequency trackingresolution of representationroot mean squareoperational conditionssynchrosqueezed transform AcknowledgementsThe author expresses his gratitude to Dr. Ki Young Koo at the University of Exeter for providing the monitored data and contributing to the code.Disclosure statementThe author reports there are no competing interests to declare.","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":"53 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135934370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-02DOI: 10.1080/15732479.2023.2275689
Mauro Sassu, Mario Lucio Puppio, Fabio Doveri, Martina Ferrini, Fausto Mistretta
AbstractThis paper addresses the strengthening of a reinforced concrete (RC) road bridge with Gerber-type beams, prompted by the recent collapses of some Italian bridges. The study discusses the characteristics of half-joint bridges, also known as Gerber beam types. These designs, originating in the late 1800s and commonly utilized from the 1950s to the 1970s, exhibit an isostatic structure. While they are easy to design, typically featuring pairs of piers with symmetrical cantilevers and two or more suspended spans, they often suffer from weakening of the half joints (saddles), necessitating structural consolidation. Designers have proposed several solutions to strengthen this type of bridges and the approach presented in this paper focuses on cost-effectiveness and efficiency. It involves a gradual demolition of longitudinal strips on the RC slab of suspended beams, followed by the installation of new steel beams to create a mixed RC-steel system. The application of this method is illustrated in a double-pier bridge spanning the Arno River, Italy. The bridge’s rehabilitation required a complete closure of the traffic road for twelve weeks, followed by alternating traffic for twenty-four weeks. The paper discusses both the design and construction aspects of the proposed intervention, considering costs and implementation time. Furthermore, a low-cost health monitoring procedure is briefly introduced.Keywords: Brittle collapsecomposite steel structuresconstruction phasesgerber beamhealth monitoring strategylow-cost rehabilitationRC bridge strengtheningroad bridge AcknowledgementsThe authors thanks to C. Ristori of the technical staff of the District of Pisa for data collected, together with C. Ricci and G. Mariani (RI-MA Engineering, Lucca) for co-operation during works. The Ministry of University and Research for project PRIN 2020 S-MoSES. The Consortium RELUIS-CSLLPP project for Monitoring Bridges and DPC-RELUIS 2022-2024 WP5.4Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe financial support is given by the Research Project ‘Smart Monitoring for Safety of Existing Structures and infrastructures’ (S-MoSES) financed by Italian Ministry of University and Research PRIN 2020 – D.R. N.607 - 3th July 2020.
{"title":"A time and cost-effective strengthening of RC half joint bridges exposed to brittle failure: application to a case study","authors":"Mauro Sassu, Mario Lucio Puppio, Fabio Doveri, Martina Ferrini, Fausto Mistretta","doi":"10.1080/15732479.2023.2275689","DOIUrl":"https://doi.org/10.1080/15732479.2023.2275689","url":null,"abstract":"AbstractThis paper addresses the strengthening of a reinforced concrete (RC) road bridge with Gerber-type beams, prompted by the recent collapses of some Italian bridges. The study discusses the characteristics of half-joint bridges, also known as Gerber beam types. These designs, originating in the late 1800s and commonly utilized from the 1950s to the 1970s, exhibit an isostatic structure. While they are easy to design, typically featuring pairs of piers with symmetrical cantilevers and two or more suspended spans, they often suffer from weakening of the half joints (saddles), necessitating structural consolidation. Designers have proposed several solutions to strengthen this type of bridges and the approach presented in this paper focuses on cost-effectiveness and efficiency. It involves a gradual demolition of longitudinal strips on the RC slab of suspended beams, followed by the installation of new steel beams to create a mixed RC-steel system. The application of this method is illustrated in a double-pier bridge spanning the Arno River, Italy. The bridge’s rehabilitation required a complete closure of the traffic road for twelve weeks, followed by alternating traffic for twenty-four weeks. The paper discusses both the design and construction aspects of the proposed intervention, considering costs and implementation time. Furthermore, a low-cost health monitoring procedure is briefly introduced.Keywords: Brittle collapsecomposite steel structuresconstruction phasesgerber beamhealth monitoring strategylow-cost rehabilitationRC bridge strengtheningroad bridge AcknowledgementsThe authors thanks to C. Ristori of the technical staff of the District of Pisa for data collected, together with C. Ricci and G. Mariani (RI-MA Engineering, Lucca) for co-operation during works. The Ministry of University and Research for project PRIN 2020 S-MoSES. The Consortium RELUIS-CSLLPP project for Monitoring Bridges and DPC-RELUIS 2022-2024 WP5.4Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe financial support is given by the Research Project ‘Smart Monitoring for Safety of Existing Structures and infrastructures’ (S-MoSES) financed by Italian Ministry of University and Research PRIN 2020 – D.R. N.607 - 3th July 2020.","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":"58 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135934683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-29DOI: 10.1080/15732479.2023.2271887
Ebrahim Afsar Dizaj, Mohammad R. Salami, Mohammad M. Kashani
{"title":"Impact of asymmetrical corrosion of piers on seismic fragility of ageing irregular concrete bridges","authors":"Ebrahim Afsar Dizaj, Mohammad R. Salami, Mohammad M. Kashani","doi":"10.1080/15732479.2023.2271887","DOIUrl":"https://doi.org/10.1080/15732479.2023.2271887","url":null,"abstract":"","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":"33 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136157840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-28DOI: 10.1080/15732479.2023.2265908
Mohammad Ali Mohammad Taghizadeh, Abbas Karamodin
AbstractSeismic evaluation of suspended zipper-braced frames, which are an alternative to inverted-V-braced frames to improve their seismic behavior, is of greatest significance to determine the level of confidence in this type of seismic system during severe earthquakes. The arrangement and design parameters of these frames are mentioned in some references, but there is no probabilistic assessment of collapse risk based on various collapse uncertainties. To evaluate the probability of collapse and margin of safety, eighteen suspended zipper-braced frames with different geometry parameters in the most severe seismic design category (Dmax) have been designed. The designed frames were modeled in OpenSees software by considering the effect of gusset plate connections and evaluated by performing more than 15,800 dynamic and nonlinear static pushover analyses using FEMA P695 methodology. Total collapse uncertainty is considered in the evaluation of the probabilistic behavior of frames. The results show that the adjusted collapse margin ratio (ACMR) of designed frames by considering the total collapse uncertainty of 0.726 and 0.529 is 27% and 64% higher than the acceptance criteria, respectively. The results also indicate that a response modification coefficient of much more than 6 can be used for the economic design of long-period suspended zipper-braced frames.Keywords: Collapse uncertaintyincremental dynamic analysesprobabilistic evaluationsafety margin ratiosuspended Zipper-Braced frame Disclosure statementThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
{"title":"Seismic collapse safety assessment of suspended zipper-braced frames","authors":"Mohammad Ali Mohammad Taghizadeh, Abbas Karamodin","doi":"10.1080/15732479.2023.2265908","DOIUrl":"https://doi.org/10.1080/15732479.2023.2265908","url":null,"abstract":"AbstractSeismic evaluation of suspended zipper-braced frames, which are an alternative to inverted-V-braced frames to improve their seismic behavior, is of greatest significance to determine the level of confidence in this type of seismic system during severe earthquakes. The arrangement and design parameters of these frames are mentioned in some references, but there is no probabilistic assessment of collapse risk based on various collapse uncertainties. To evaluate the probability of collapse and margin of safety, eighteen suspended zipper-braced frames with different geometry parameters in the most severe seismic design category (Dmax) have been designed. The designed frames were modeled in OpenSees software by considering the effect of gusset plate connections and evaluated by performing more than 15,800 dynamic and nonlinear static pushover analyses using FEMA P695 methodology. Total collapse uncertainty is considered in the evaluation of the probabilistic behavior of frames. The results show that the adjusted collapse margin ratio (ACMR) of designed frames by considering the total collapse uncertainty of 0.726 and 0.529 is 27% and 64% higher than the acceptance criteria, respectively. The results also indicate that a response modification coefficient of much more than 6 can be used for the economic design of long-period suspended zipper-braced frames.Keywords: Collapse uncertaintyincremental dynamic analysesprobabilistic evaluationsafety margin ratiosuspended Zipper-Braced frame Disclosure statementThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":"4 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136158868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-27DOI: 10.1080/15732479.2023.2272725
Alessandro Pucci, Hélder S. Sousa, Linda Giresini, José C. Matos, Fabio Castelli
AbstractA resilient bridge network is vital to a community recovery after natural disasters. Floods are the main cause of bridge collapses, but there is little research on the combined fragility of single-span bridge decks to hydrodynamic forces and driftwood clogging. Moreover, most studies concentrate on multi-span bridges and piers. By using HEC-RAS software and in-house developed Python scripts, this work proposes a method to obtain fragility curves for single-span bridges accounting for hydrodynamic actions and driftwood. Due to the lack of indications from standards concerning uplift and overturning of bridge decks, these limit states are included in the formulation together with slippage. Results revealed that all three limit states must be taken into account and showed that driftwood clogging can have a severe impact on the failure probability of the bridge, with even a minor decrease in clearance causing a significant safety reduction. Additionally, this work discusses the influence of hydrologic model recalibration on the failure probability of a structure.Keywords: Driftwood cloggingfloodsfragility curveshydrodynamic actionshydrologic modelssingle-span bridges AcknowledgmentsThe first, second and fourth authors acknowledge that, this work was partly financed by FCT/MCTES through national funds (PIDDAC) under the R&D Unit Institute for Sustainability and Innovation in Structural Engineering (ISISE), under reference UIDB/04029/2020, and under the Associate Laboratory Advanced Production and Intelligent Systems ARISE under reference LA/P/0112/2020. This work was supported by the FCT Foundation for Science and Technology under Grant SFRH/BD/145478/2019. The calibrated HEC-RAS 1D Model was provided for research purposes only by ‘Direzione Difesa del Suolo e Protezione Civile’ of Regione Toscana. We would like to thank Ing. Gennaro Costabile and Ing. Francesco Piani for their kind help in providing the abovementioned model.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis study was supported by the Fundação para a Ciência e a Tecnologia.
摘要弹性桥梁网络是灾后社区重建的重要组成部分。洪水是桥梁垮塌的主要原因，但对单跨桥面在水动力和浮木堵塞作用下的联合脆弱性研究较少。此外，大多数研究集中在多跨桥梁和桥墩上。通过使用HEC-RAS软件和内部开发的Python脚本，本工作提出了一种获得考虑水动力作用和浮木的单跨桥梁易损性曲线的方法。由于缺乏标准中关于桥面隆起和倾覆的指示，这些极限状态与滑移一起包含在公式中。结果表明，必须考虑所有三种极限状态，并表明浮木堵塞会对桥梁的破坏概率产生严重影响，即使间隙很小也会导致显著的安全降低。此外，本文还讨论了水文模型再标定对结构破坏概率的影响。第一、第二和第四作者承认，本研究由FCT/MCTES通过国家基金(PIDDAC)资助，由结构工程可持续发展与创新研究所(ISISE)资助，参考文献为UIDB/04029/2020，由副实验室资助，参考文献为LA/P/0112/2020。本研究由FCT科学技术基金资助，项目编号:SFRH/BD/145478/2019。校准后的HEC-RAS 1D模型仅由托斯卡纳地区的“Direzione Difesa del Suolo e Protezione Civile”提供用于研究目的。我们要感谢Ing。Gennaro Costabile和Ing。感谢Francesco Piani在提供上述模型方面的帮助。披露声明作者未报告潜在的利益冲突。本研究得到了联合国科学与技术基金会Ciência第1段的支持。
{"title":"Fragility of bridge decks exposed to hydraulic and driftwood actions","authors":"Alessandro Pucci, Hélder S. Sousa, Linda Giresini, José C. Matos, Fabio Castelli","doi":"10.1080/15732479.2023.2272725","DOIUrl":"https://doi.org/10.1080/15732479.2023.2272725","url":null,"abstract":"AbstractA resilient bridge network is vital to a community recovery after natural disasters. Floods are the main cause of bridge collapses, but there is little research on the combined fragility of single-span bridge decks to hydrodynamic forces and driftwood clogging. Moreover, most studies concentrate on multi-span bridges and piers. By using HEC-RAS software and in-house developed Python scripts, this work proposes a method to obtain fragility curves for single-span bridges accounting for hydrodynamic actions and driftwood. Due to the lack of indications from standards concerning uplift and overturning of bridge decks, these limit states are included in the formulation together with slippage. Results revealed that all three limit states must be taken into account and showed that driftwood clogging can have a severe impact on the failure probability of the bridge, with even a minor decrease in clearance causing a significant safety reduction. Additionally, this work discusses the influence of hydrologic model recalibration on the failure probability of a structure.Keywords: Driftwood cloggingfloodsfragility curveshydrodynamic actionshydrologic modelssingle-span bridges AcknowledgmentsThe first, second and fourth authors acknowledge that, this work was partly financed by FCT/MCTES through national funds (PIDDAC) under the R&D Unit Institute for Sustainability and Innovation in Structural Engineering (ISISE), under reference UIDB/04029/2020, and under the Associate Laboratory Advanced Production and Intelligent Systems ARISE under reference LA/P/0112/2020. This work was supported by the FCT Foundation for Science and Technology under Grant SFRH/BD/145478/2019. The calibrated HEC-RAS 1D Model was provided for research purposes only by ‘Direzione Difesa del Suolo e Protezione Civile’ of Regione Toscana. We would like to thank Ing. Gennaro Costabile and Ing. Francesco Piani for their kind help in providing the abovementioned model.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis study was supported by the Fundação para a Ciência e a Tecnologia.","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":"54 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136262471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-27DOI: 10.1080/15732479.2023.2272722
Zhiwen Ye, Weiping Zhang, Xianglin Gu
AbstractStirrups always corrode earlier than the longitudinal steel bars in RC beams, and the corrosion degree is higher. Stirrups will lose their bearing capacity due to corrosion, leading to a decrease in shear strength. Thus, the failure mode may change from bending to shear failure. Previous studies have proposed models to predict corroded RC beams' flexural and shear behavior, respectively. The missing link in these models was the absence of the change of failure modes on the structural behavior. This paper covers the authors' study of corroded RC beams, investigating the effects of reinforcement corrosion on the transformation of failure modes. A numerical simulation was performed to analyze RC beams' time-dependent behavior and failure modes. The effects of the concrete cover thickness, the corrosion initiation time, the concrete strength, and the reinforcement configuration were also investigated. The analysis showed that the stirrups corroded earlier than longitudinal steel bars, leading to potential shear failure rather than bending failure. The larger diameter of stirrups could be adopted in the design to delay the deterioration of structural behavior and the transformation of failure mode. Prolonging the corrosion initiation time using thicker concrete cover thickness and higher strength of concrete is also effective.Keywords: Corrosiondeteriorationmarine environmentRC structurestime-dependent strengthtransformation of failure modes Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationFundingThis research project was financially supported by the National Natural Science Foundation of China (Grant No. 51878486) and Program of Shanghai Science and Technology Committee (Grant No. 22dz1203600).
{"title":"Potential change of failure modes and time-dependent behavior of RC beams under a marine atmospheric environment","authors":"Zhiwen Ye, Weiping Zhang, Xianglin Gu","doi":"10.1080/15732479.2023.2272722","DOIUrl":"https://doi.org/10.1080/15732479.2023.2272722","url":null,"abstract":"AbstractStirrups always corrode earlier than the longitudinal steel bars in RC beams, and the corrosion degree is higher. Stirrups will lose their bearing capacity due to corrosion, leading to a decrease in shear strength. Thus, the failure mode may change from bending to shear failure. Previous studies have proposed models to predict corroded RC beams' flexural and shear behavior, respectively. The missing link in these models was the absence of the change of failure modes on the structural behavior. This paper covers the authors' study of corroded RC beams, investigating the effects of reinforcement corrosion on the transformation of failure modes. A numerical simulation was performed to analyze RC beams' time-dependent behavior and failure modes. The effects of the concrete cover thickness, the corrosion initiation time, the concrete strength, and the reinforcement configuration were also investigated. The analysis showed that the stirrups corroded earlier than longitudinal steel bars, leading to potential shear failure rather than bending failure. The larger diameter of stirrups could be adopted in the design to delay the deterioration of structural behavior and the transformation of failure mode. Prolonging the corrosion initiation time using thicker concrete cover thickness and higher strength of concrete is also effective.Keywords: Corrosiondeteriorationmarine environmentRC structurestime-dependent strengthtransformation of failure modes Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationFundingThis research project was financially supported by the National Natural Science Foundation of China (Grant No. 51878486) and Program of Shanghai Science and Technology Committee (Grant No. 22dz1203600).","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":"18 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136261809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-16DOI: 10.1080/15732479.2023.2266745
Min Wu, Youyi Zeng, Liu Jin, Xiuli Du
AbstractIt is commonly understood that precast technology has been rapid development and application due to its short construction period and environmental friendly, etc. Among all precast structure, precast segment column has been widely concerned in the substructure of bridges. The precast segment columns will not only suffer from the earthquake loads but also be subjected to the collision of vehicle and barges. The concrete segments of precast segment column subjected to vehicle collision are prone to slip and even punching failure. In order to enhance the shear resistance between concrete segments, the precast segment column with shear key is designed, and the dynamic performance and shear mechanism under vehicle collision are analysed in this work. The results indicate that the shear key improves the shear capacity between segments and effectively reduces the relative displacement between segments, and makes the deformation mode of precast segment column change from shear type to bending type under vehicle collision. The maximum impact force of precast segment column with shear key is larger than that without shear key. Besides, the shear mechanism of precast segment column is revealed, and the calculation formula of local shear resistance is proposed.Keywords: Precast segment columnshear keysvehicle collisionimpact forcedeformation moderelative displacementshear mechanismfailure modes Disclosure statementThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this article.Additional informationFundingThis research was supported by the National Natural Science Foundation of China (Nos. 51978022, 51421005, and 52208458), and the Natural Science Foundation of Hunan Province (No. 2023JJ40045).
{"title":"Numerical study of precast segment columns with shear keys under vehicle collision","authors":"Min Wu, Youyi Zeng, Liu Jin, Xiuli Du","doi":"10.1080/15732479.2023.2266745","DOIUrl":"https://doi.org/10.1080/15732479.2023.2266745","url":null,"abstract":"AbstractIt is commonly understood that precast technology has been rapid development and application due to its short construction period and environmental friendly, etc. Among all precast structure, precast segment column has been widely concerned in the substructure of bridges. The precast segment columns will not only suffer from the earthquake loads but also be subjected to the collision of vehicle and barges. The concrete segments of precast segment column subjected to vehicle collision are prone to slip and even punching failure. In order to enhance the shear resistance between concrete segments, the precast segment column with shear key is designed, and the dynamic performance and shear mechanism under vehicle collision are analysed in this work. The results indicate that the shear key improves the shear capacity between segments and effectively reduces the relative displacement between segments, and makes the deformation mode of precast segment column change from shear type to bending type under vehicle collision. The maximum impact force of precast segment column with shear key is larger than that without shear key. Besides, the shear mechanism of precast segment column is revealed, and the calculation formula of local shear resistance is proposed.Keywords: Precast segment columnshear keysvehicle collisionimpact forcedeformation moderelative displacementshear mechanismfailure modes Disclosure statementThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this article.Additional informationFundingThis research was supported by the National Natural Science Foundation of China (Nos. 51978022, 51421005, and 52208458), and the Natural Science Foundation of Hunan Province (No. 2023JJ40045).","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136078620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-13DOI: 10.1080/15732479.2023.2265909
Francesca Poli, Mattia Francesco Bado, Luca Possidente, Daniele Zonta
AbstractNumerous bridges worldwide have surpassed their service-life. To ensure the user safety, visual inspections are commonly carried out with the consequent assignment of Defect Grades. On their basis, simplified risk evaluations and maintenance intervention prioritization are formulated. Per the inherent nature of visual inspections, these ones include two kinds of uncertainty: interpretation-related and representation-related one. If to attempt to reduce their influence in the inspective process, the former, being an intrinsic feature of inspections performed by humans, could not be tackled. The latter, instead, can be decreased on the basis of a novel semantics-based inspective methodology. On the grounds of a large set of real-life inspections outputs, the present article measures the inspection quality improvement following said uncertainty reduction. This was achieved through the Expected Utility Theory in terms of utility and costs. On the grounds of these two, a novel Uncertainty-induced Cost curve allows the assessment of the cost evolution as a function of the weight of the representation-related uncertainty. The proposed semantics-based inspective methodology represents an improvement over the current-day directly assigned condition grading one, thus improving the efficiency of structural reliability assessments. This leads to an improved prioritization of bridge maintenance interventions and to an increased user safety.Keywords: Bridgebridge maintenancestructural reliability assessmentdamage assessmentinspectionstructural safetyservice lifebridge inspection quality AcknowledgementsThe work presented in this paper was carried out under the research agreement between Autostrade per l’Italia (ASPI) and the University of Trento. This research has been supported also by Ministry of Education University and Research MIUR PON RI 2014-2020 Program (Project MITIGO, ARS01_00964), Consorzio della Rete dei Laboratori Universitari di Ingegneria Sismica e Strutturale ReLUIS Ponti 2021- 2022 ‘Implementation of provisions of DM 578/2020’, and DPC-ReLUIS 2022-2024 ‘Monitoring and satellite data’.Disclosure statementDaniele Zonta reports financial support was provided by University of Trento. Daniele Zonta reports a relationship with Government of Italy Ministry of Education University and Research that includes: funding grants. Daniele Zonta reports a relationship with Consorzio della Rete dei Laboratori Universitari di Ingegneria Sismica e Strutturale that includes funding grants.
{"title":"Benefits of decreasing the uncertainty in the current bridge inspection practice","authors":"Francesca Poli, Mattia Francesco Bado, Luca Possidente, Daniele Zonta","doi":"10.1080/15732479.2023.2265909","DOIUrl":"https://doi.org/10.1080/15732479.2023.2265909","url":null,"abstract":"AbstractNumerous bridges worldwide have surpassed their service-life. To ensure the user safety, visual inspections are commonly carried out with the consequent assignment of Defect Grades. On their basis, simplified risk evaluations and maintenance intervention prioritization are formulated. Per the inherent nature of visual inspections, these ones include two kinds of uncertainty: interpretation-related and representation-related one. If to attempt to reduce their influence in the inspective process, the former, being an intrinsic feature of inspections performed by humans, could not be tackled. The latter, instead, can be decreased on the basis of a novel semantics-based inspective methodology. On the grounds of a large set of real-life inspections outputs, the present article measures the inspection quality improvement following said uncertainty reduction. This was achieved through the Expected Utility Theory in terms of utility and costs. On the grounds of these two, a novel Uncertainty-induced Cost curve allows the assessment of the cost evolution as a function of the weight of the representation-related uncertainty. The proposed semantics-based inspective methodology represents an improvement over the current-day directly assigned condition grading one, thus improving the efficiency of structural reliability assessments. This leads to an improved prioritization of bridge maintenance interventions and to an increased user safety.Keywords: Bridgebridge maintenancestructural reliability assessmentdamage assessmentinspectionstructural safetyservice lifebridge inspection quality AcknowledgementsThe work presented in this paper was carried out under the research agreement between Autostrade per l’Italia (ASPI) and the University of Trento. This research has been supported also by Ministry of Education University and Research MIUR PON RI 2014-2020 Program (Project MITIGO, ARS01_00964), Consorzio della Rete dei Laboratori Universitari di Ingegneria Sismica e Strutturale ReLUIS Ponti 2021- 2022 ‘Implementation of provisions of DM 578/2020’, and DPC-ReLUIS 2022-2024 ‘Monitoring and satellite data’.Disclosure statementDaniele Zonta reports financial support was provided by University of Trento. Daniele Zonta reports a relationship with Government of Italy Ministry of Education University and Research that includes: funding grants. Daniele Zonta reports a relationship with Consorzio della Rete dei Laboratori Universitari di Ingegneria Sismica e Strutturale that includes funding grants.","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135917884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-13DOI: 10.1080/15732479.2023.2266709
Van-Quang Nguyen, Hoang D. Nguyen, Floriana Petrone, Duhee Park
AbstractThis study develops and compares the performance of eight machine learning (ML) models to rapidly predict the seismic damage state of underground box tunnels. Nonlinear time history analyses of 24 soil-tunnel configurations subject to 85 ground motions were performed to generate the dataset for the ML models. The aspect ratio, buried depth, flexibility ratio, and 23 ground motion intensity measures (IMs) are employed as input variables of ML models. The output variables are four damage states, namely ‘none’, ‘minor’, ‘moderate’, and ‘extensive’. Among the eight ML models, LightGBM is found to yield the most favorable prediction of the damage states, resulting in an accuracy of 91%. The effects of earthquake IMs were also examined. Results show that the spectral acceleration (Sa(T1)) and spectral displacement (Sd(T1)) at the fundamental period of the site (T1) have the strongest correlation with the damage prediction. Finally, the effect of reducing the input variables to two groups (i.e. combinations of soil-tunnel configuration parameters with top five and top ten ranked IMs) on the model prediction capability was investigated. Accordingly, Sd(T1), Sa(T1), acceleration spectrum intensity, spectral velocity, and velocity spectrum intensity were identified as the key parameters representing the ground-motion characteristics needed for the predictive model.Keywords: Box tunnelsgradient boosting methodsintensity measuresmachine learningnonlinear analysisseismic damage statesoil-tunnel interaction Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) [No. 2022R1A2C3003245].
{"title":"Rapid damage state classification for underground box tunnels using machine learning","authors":"Van-Quang Nguyen, Hoang D. Nguyen, Floriana Petrone, Duhee Park","doi":"10.1080/15732479.2023.2266709","DOIUrl":"https://doi.org/10.1080/15732479.2023.2266709","url":null,"abstract":"AbstractThis study develops and compares the performance of eight machine learning (ML) models to rapidly predict the seismic damage state of underground box tunnels. Nonlinear time history analyses of 24 soil-tunnel configurations subject to 85 ground motions were performed to generate the dataset for the ML models. The aspect ratio, buried depth, flexibility ratio, and 23 ground motion intensity measures (IMs) are employed as input variables of ML models. The output variables are four damage states, namely ‘none’, ‘minor’, ‘moderate’, and ‘extensive’. Among the eight ML models, LightGBM is found to yield the most favorable prediction of the damage states, resulting in an accuracy of 91%. The effects of earthquake IMs were also examined. Results show that the spectral acceleration (Sa(T1)) and spectral displacement (Sd(T1)) at the fundamental period of the site (T1) have the strongest correlation with the damage prediction. Finally, the effect of reducing the input variables to two groups (i.e. combinations of soil-tunnel configuration parameters with top five and top ten ranked IMs) on the model prediction capability was investigated. Accordingly, Sd(T1), Sa(T1), acceleration spectrum intensity, spectral velocity, and velocity spectrum intensity were identified as the key parameters representing the ground-motion characteristics needed for the predictive model.Keywords: Box tunnelsgradient boosting methodsintensity measuresmachine learningnonlinear analysisseismic damage statesoil-tunnel interaction Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) [No. 2022R1A2C3003245].","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135858217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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