Pub Date : 2023-11-10DOI: 10.1080/15732479.2023.2276373
Putri S. Firdaus, Hiroshi Matsuzaki, Mitsuyoshi Akiyama, Koki Aoki, Dan M. Frangopol
AbstractTo estimate the connectivity of a road network, it is crucial to evaluate the correlation of hazard intensities among individual bridge locations since the probability of multiple bridges being damaged simultaneously depends on the degree of this correlation. However, research on connectivity assessment of bridge networks considering spatial correlations associated with flood intensities is scarce in the literature. When quantifying the spatial correlation of flood intensities, modeling based on the stream distance rather than the Euclidean distance is required, taking into account that river flow is restricted only within the stream network. To achieve this purpose, a novel methodology is proposed to evaluate the spatial correlation of a stream network based on a geostatistical linear model and stream network covariance models. In addition, this study considers the spatial correlation of seismic hazard intensity. With the proposed method, it is possible to identify which bridges play an important role in ensuring the connectivity of the road network under multiple hazards, i.e. flood and seismic. As an illustrative example, the proposed method is applied to a hypothetical bridge network in Kumamoto Prefecture, Japan. The results demonstrate that improved network connectivity can be achieved by implementing a relevant retrofitting strategy for important bridges.Keywords: Network connectivitybridgesspatial correlationmultiple hazardsflood hazardseismic hazardMonte Carlo simulation Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by JSPS KAKENHI (Grant number: 23H00217) and JST-JICA SATREPS (Grant ID: JPMJSA2009).
{"title":"Probabilistic connectivity assessment of bridge networks considering spatial correlations associated with flood and seismic hazards","authors":"Putri S. Firdaus, Hiroshi Matsuzaki, Mitsuyoshi Akiyama, Koki Aoki, Dan M. Frangopol","doi":"10.1080/15732479.2023.2276373","DOIUrl":"https://doi.org/10.1080/15732479.2023.2276373","url":null,"abstract":"AbstractTo estimate the connectivity of a road network, it is crucial to evaluate the correlation of hazard intensities among individual bridge locations since the probability of multiple bridges being damaged simultaneously depends on the degree of this correlation. However, research on connectivity assessment of bridge networks considering spatial correlations associated with flood intensities is scarce in the literature. When quantifying the spatial correlation of flood intensities, modeling based on the stream distance rather than the Euclidean distance is required, taking into account that river flow is restricted only within the stream network. To achieve this purpose, a novel methodology is proposed to evaluate the spatial correlation of a stream network based on a geostatistical linear model and stream network covariance models. In addition, this study considers the spatial correlation of seismic hazard intensity. With the proposed method, it is possible to identify which bridges play an important role in ensuring the connectivity of the road network under multiple hazards, i.e. flood and seismic. As an illustrative example, the proposed method is applied to a hypothetical bridge network in Kumamoto Prefecture, Japan. The results demonstrate that improved network connectivity can be achieved by implementing a relevant retrofitting strategy for important bridges.Keywords: Network connectivitybridgesspatial correlationmultiple hazardsflood hazardseismic hazardMonte Carlo simulation Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by JSPS KAKENHI (Grant number: 23H00217) and JST-JICA SATREPS (Grant ID: JPMJSA2009).","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135186236","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}
AbstractBase isolation technology is highly advocated by the research community worldwide for efficient mitigation of earthquake-induced vibrations and alleviating seismic risks posed to civil engineering structures. However, the construction cost of implementing this advanced technique to real-life buildings compared to the conventional ones remains a debatable topic, and a research problem to examine. Therefore, the present study focuses on assessing the short- and long-term cost-benefits of base-isolated buildings vis-é-vis fixed-base buildings over their service life. Notably, the benefit-cost analysis methodology prescribed in FEMA-356 is utilized to quantify the economic consequences of natural calamities on the base-isolated building. Various aspects, such as structural responses, damage vulnerability, collapse probability, and occupancy rate are thoroughly analyzed. A real-life mid-rise reinforced concrete building in the Indian subcontinent, having double-curvature friction pendulum bearings (FPBs) at stilt level is deliberated in this study. A series of quasi-static and nonlinear time-history analyses are carried out based on the recently drafted Indian seismic code for base isolation to comprehend the improved performance of the FPB-isolated building. Additionally, two fixed-base buildings are designed with an aim to make their performance almost at par with the base-isolated building, and then to assess the cost implications of attaining such comparable performance. The outcomes of this study, particularly the structural performance enhancement and cost benefits, will assist both decision makers and structural designers to have a persuasive opinion on the better adaptability of the base isolation technology for improved seismic resistance and financial outlooks associated thereof.Keywords: Friction pendulum bearingIndian seismic code and provisionsperformance-based seismic designBenefit-cost analysisLoss estimationPassive vibration control Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationFundingThe financial support extended by M/s Resistoflex Dynamics Private Limited, Sector 2, NOIDA, Uttar Pradesh (U.P.) – 201 301, India in conducting the present study is gratefully acknowledged.
{"title":"Seismic performance assessment and benefit-cost analysis of mid-rise reinforced concrete base-isolated building using double-curvature friction pendulum bearings","authors":"Jagajyoti Panda, Vijay Singh, Ratish Jain, Vasant Matsagar","doi":"10.1080/15732479.2023.2275698","DOIUrl":"https://doi.org/10.1080/15732479.2023.2275698","url":null,"abstract":"AbstractBase isolation technology is highly advocated by the research community worldwide for efficient mitigation of earthquake-induced vibrations and alleviating seismic risks posed to civil engineering structures. However, the construction cost of implementing this advanced technique to real-life buildings compared to the conventional ones remains a debatable topic, and a research problem to examine. Therefore, the present study focuses on assessing the short- and long-term cost-benefits of base-isolated buildings vis-é-vis fixed-base buildings over their service life. Notably, the benefit-cost analysis methodology prescribed in FEMA-356 is utilized to quantify the economic consequences of natural calamities on the base-isolated building. Various aspects, such as structural responses, damage vulnerability, collapse probability, and occupancy rate are thoroughly analyzed. A real-life mid-rise reinforced concrete building in the Indian subcontinent, having double-curvature friction pendulum bearings (FPBs) at stilt level is deliberated in this study. A series of quasi-static and nonlinear time-history analyses are carried out based on the recently drafted Indian seismic code for base isolation to comprehend the improved performance of the FPB-isolated building. Additionally, two fixed-base buildings are designed with an aim to make their performance almost at par with the base-isolated building, and then to assess the cost implications of attaining such comparable performance. The outcomes of this study, particularly the structural performance enhancement and cost benefits, will assist both decision makers and structural designers to have a persuasive opinion on the better adaptability of the base isolation technology for improved seismic resistance and financial outlooks associated thereof.Keywords: Friction pendulum bearingIndian seismic code and provisionsperformance-based seismic designBenefit-cost analysisLoss estimationPassive vibration control Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationFundingThe financial support extended by M/s Resistoflex Dynamics Private Limited, Sector 2, NOIDA, Uttar Pradesh (U.P.) – 201 301, India in conducting the present study is gratefully acknowledged.","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135290602","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 : 2023-11-07DOI: 10.1080/15732479.2023.2276896
Ayaho Miyamoto, Akito Yabe, Petr Hradil, Ilkka Hakola
AbstractThis article proposes an innovative concept of an intelligent bridge system that integrates sensors, a processing unit, and an actuator to maintain bridge safety and performance even in the face of unexpected environmental changes and disturbances. Although technically challenging, this system is an exciting prospect for young engineers who aspire to contribute to cutting-edge technological advancements. As a practical example, this article presents an ICT-based bridge remote monitoring system called the "Intelligent Bridge," which allows real-time monitoring and control during extreme events such as earthquakes and typhoons. The Intelligent Bridge comprises a stand-alone monitoring system and a web-based internet monitoring system for bridge maintenance, which is introduced as an intelligent structure integrated into the intelligent bridge system. To verify the validity of the proposed system, it is investigated the ability to adjust cable forces on a 2-span continuous cable-stayed bridge model to control its structural performance. The development of an intelligent bridge system represents a significant advancement in bridge engineering and has the potential to improve the safety and longevity of bridges, particularly in areas prone to extreme environmental events. The system proposed in this article has practical applications that can benefit both engineers and the general public.Keywords: Feasibility studyhealth monitoringinformation processingintelligent bridgeinternet monitoringlong-lifeself-examinationstand-alone monitoring Disclosure statementNo potential conflict of interest was reported by the author(s).
{"title":"Feasibility study on intelligent bridge combined with smart monitoring techniques","authors":"Ayaho Miyamoto, Akito Yabe, Petr Hradil, Ilkka Hakola","doi":"10.1080/15732479.2023.2276896","DOIUrl":"https://doi.org/10.1080/15732479.2023.2276896","url":null,"abstract":"AbstractThis article proposes an innovative concept of an intelligent bridge system that integrates sensors, a processing unit, and an actuator to maintain bridge safety and performance even in the face of unexpected environmental changes and disturbances. Although technically challenging, this system is an exciting prospect for young engineers who aspire to contribute to cutting-edge technological advancements. As a practical example, this article presents an ICT-based bridge remote monitoring system called the \"Intelligent Bridge,\" which allows real-time monitoring and control during extreme events such as earthquakes and typhoons. The Intelligent Bridge comprises a stand-alone monitoring system and a web-based internet monitoring system for bridge maintenance, which is introduced as an intelligent structure integrated into the intelligent bridge system. To verify the validity of the proposed system, it is investigated the ability to adjust cable forces on a 2-span continuous cable-stayed bridge model to control its structural performance. The development of an intelligent bridge system represents a significant advancement in bridge engineering and has the potential to improve the safety and longevity of bridges, particularly in areas prone to extreme environmental events. The system proposed in this article has practical applications that can benefit both engineers and the general public.Keywords: Feasibility studyhealth monitoringinformation processingintelligent bridgeinternet monitoringlong-lifeself-examinationstand-alone monitoring Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135479904","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 : 2023-11-05DOI: 10.1080/15732479.2023.2274878
Parham Paydavosi, Mohammad Saied Dehghani, Sue McNeil
AbstractEffective maintenance decisions for bridges depend on accurate performance prediction. Machine learning (ML) models use historical bridge performance data to learn and predict performance. However, in many agencies, the condition history of bridges is limited and does not go beyond a few years. The question, therefore, is, to what extent does condition history help us make better predictions? To address this question, a ML model was developed that analysed more than 600,000 bridge decks with 27 years of condition history. Two data selection methods were designed: non-overlapping and overlapping data. The non-overlapping data are typically used to train the model. The overlapping data introduced in this study uses the data more efficiently for model training recognising that strings of historical data convey more information. Longer term predictions were found to be positively impacted by every additional year of condition history. Short-term condition prediction (one or two years) does not need significant historical data. It was also found that overlapping data, compared to non-overlapping data, produced larger training samples and had higher prediction accuracy in the majority of experiments, but at the cost of higher running time due to a larger sample size.Keywords: Artificial intelligencebig datainfrastructure asset managementmachine learningbridge structure deteriorationbridge conditionneural networkperformance prediction Disclosure statementNo potential conflict of interest was reported by the author(s).
{"title":"Evaluating the accuracy of predicted bridge condition using machine learning: the role of condition history","authors":"Parham Paydavosi, Mohammad Saied Dehghani, Sue McNeil","doi":"10.1080/15732479.2023.2274878","DOIUrl":"https://doi.org/10.1080/15732479.2023.2274878","url":null,"abstract":"AbstractEffective maintenance decisions for bridges depend on accurate performance prediction. Machine learning (ML) models use historical bridge performance data to learn and predict performance. However, in many agencies, the condition history of bridges is limited and does not go beyond a few years. The question, therefore, is, to what extent does condition history help us make better predictions? To address this question, a ML model was developed that analysed more than 600,000 bridge decks with 27 years of condition history. Two data selection methods were designed: non-overlapping and overlapping data. The non-overlapping data are typically used to train the model. The overlapping data introduced in this study uses the data more efficiently for model training recognising that strings of historical data convey more information. Longer term predictions were found to be positively impacted by every additional year of condition history. Short-term condition prediction (one or two years) does not need significant historical data. It was also found that overlapping data, compared to non-overlapping data, produced larger training samples and had higher prediction accuracy in the majority of experiments, but at the cost of higher running time due to a larger sample size.Keywords: Artificial intelligencebig datainfrastructure asset managementmachine learningbridge structure deteriorationbridge conditionneural networkperformance prediction Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135725934","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}
AbstractThis article reports the process that allowed to check the condition of a steel railway bridge having a strategic position within the network. The framework representing the actions needed for the service life extension of the bridge is first described, then the conducted inspections are illustrated, together with the developed numerical analyses and the conception of specific tests on site. The conclusion, downstream of all these analyses and with the comparison of the real-life experiments, was to allow a limited extension of the useful life of the bridge, even with some reductions in the safety factor, respecting a reduction in the speed of railway trains and prescribing continuous monitoring of the bridge. In this context, all the test evaluations, combined with the surveillance/monitoring, and joined with an important numerical modelling activity, lead to the concept of “structural augmentation” of the bridge for service life extension purposes. The specific case of the examined bridge is supposed to be an example of good practice useful for infrastructure authorities.Keywords: Railway bridgesbridge managementservice lifebridge modellingtraffic limitationcontinuous monitoringstructural augmentation Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe Financial support of the Research Project No. CN1221844D08208F from Sapienza University of Rome under the umbrella of the national program PNRR – CN1 – Spoke 5 (Directorial Decretation no. 1031 of June, 17th, 2022) is gratefully acknowledged by the authors from Sapienza University of Rome.
摘要本文报道了对某具有战略地位的铁路桥进行状态检测的过程。首先描述了代表桥梁使用寿命延长所需行动的框架，然后说明了所进行的检查，以及开发的数值分析和现场具体试验的概念。所有这些分析的结论，以及与实际实验的比较，是允许有限地延长桥梁的使用寿命，即使在安全系数有所降低的情况下，考虑到铁路列车速度的降低，并规定对桥梁进行持续监测。在这种情况下，所有的试验评估，结合监测/监测，并结合一个重要的数值模拟活动，导致桥梁的“结构增强”概念，以延长使用寿命。被检查的桥梁的具体情况应该是基础设施当局有用的良好做法的一个例子。关键词:铁路桥梁桥梁管理服务寿命桥建模交通限制持续监测结构增强披露声明作者未报告潜在的利益冲突。其他信息资助研究项目的财政支持编号:CN1221844D08208F来自罗马萨皮恩扎大学，在国家计划PNRR - CN1 - Spoke 5的保护下。1031 of June 17, 2022)，感谢罗马Sapienza大学的作者。
{"title":"Service life extension of strategic bridges","authors":"Franco Bontempi, Francesco Petrini, Marina Mazzacane, Michele Ronchi, Michelangelo Monno, Rosalia Piscopo","doi":"10.1080/15732479.2023.2276368","DOIUrl":"https://doi.org/10.1080/15732479.2023.2276368","url":null,"abstract":"AbstractThis article reports the process that allowed to check the condition of a steel railway bridge having a strategic position within the network. The framework representing the actions needed for the service life extension of the bridge is first described, then the conducted inspections are illustrated, together with the developed numerical analyses and the conception of specific tests on site. The conclusion, downstream of all these analyses and with the comparison of the real-life experiments, was to allow a limited extension of the useful life of the bridge, even with some reductions in the safety factor, respecting a reduction in the speed of railway trains and prescribing continuous monitoring of the bridge. In this context, all the test evaluations, combined with the surveillance/monitoring, and joined with an important numerical modelling activity, lead to the concept of “structural augmentation” of the bridge for service life extension purposes. The specific case of the examined bridge is supposed to be an example of good practice useful for infrastructure authorities.Keywords: Railway bridgesbridge managementservice lifebridge modellingtraffic limitationcontinuous monitoringstructural augmentation Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe Financial support of the Research Project No. CN1221844D08208F from Sapienza University of Rome under the umbrella of the national program PNRR – CN1 – Spoke 5 (Directorial Decretation no. 1031 of June, 17th, 2022) is gratefully acknowledged by the authors from Sapienza University of Rome.","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135934694","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: 10.1080/15732479.2023.2275684
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":null,"pages":null},"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":null,"pages":null},"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 : 2023-10-30DOI: 10.1080/15732479.2023.2271891
Tianyou Tao, Xuehua Wen, Hao Wang, Chenxi Xing, Chunfeng Wang
{"title":"Seismic control of a long-span triple-tower suspension bridge using hysteretic steel damper","authors":"Tianyou Tao, Xuehua Wen, Hao Wang, Chenxi Xing, Chunfeng Wang","doi":"10.1080/15732479.2023.2271891","DOIUrl":"https://doi.org/10.1080/15732479.2023.2271891","url":null,"abstract":"","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136102383","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":null,"pages":null},"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":null,"pages":null},"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}
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