Pub Date : 2023-09-04DOI: 10.1080/24705314.2023.2253068
Israi Abu Shanab, Andrew D. Sorensen
{"title":"Improved removal efficiency of partial bridge deck repair patches using the saw and patch method","authors":"Israi Abu Shanab, Andrew D. Sorensen","doi":"10.1080/24705314.2023.2253068","DOIUrl":"https://doi.org/10.1080/24705314.2023.2253068","url":null,"abstract":"","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48381635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-13DOI: 10.1080/24705314.2023.2244835
Emily McAllister, D. McPolin, Jamie Graham, Grainne O’Neill
ABSTRACT Climate change is a current global issue which must be addressed in order to create a sustainable future. While European countries have embraced the use of sustainable, naturally sourced materials, such as cross-laminated timber (CLT), their use in the UK and Ireland is much more limited. Currently, CLT is only manufactured in mainland Europe using C24 timber. This has higher characteristic properties than the most common grade of timber grown in the UK and Ireland. The UK climate generally results in fast growing trees, leading to lower density timber which is often correlated to lower strength properties. This research investigates the drying and conditioning methods used to achieve a moisture content of 12%, which is required to produce CLT panels according to European standards. The addition of a strengthening material, glass fibre mesh produces a novel product for the construction industry while improving a CLT panels overall performance in bending and shear, examined through a 4-point bending test. The research also focuses on finding the most suitable way of incorporating the glass fibre mesh between the bottom two layers of CLT panels with various adhesive techniques, examined through shear tests.
{"title":"Methods of strengthening cross-laminated timber manufactured using Irish Sitka Spruce: a preliminary study","authors":"Emily McAllister, D. McPolin, Jamie Graham, Grainne O’Neill","doi":"10.1080/24705314.2023.2244835","DOIUrl":"https://doi.org/10.1080/24705314.2023.2244835","url":null,"abstract":"ABSTRACT Climate change is a current global issue which must be addressed in order to create a sustainable future. While European countries have embraced the use of sustainable, naturally sourced materials, such as cross-laminated timber (CLT), their use in the UK and Ireland is much more limited. Currently, CLT is only manufactured in mainland Europe using C24 timber. This has higher characteristic properties than the most common grade of timber grown in the UK and Ireland. The UK climate generally results in fast growing trees, leading to lower density timber which is often correlated to lower strength properties. This research investigates the drying and conditioning methods used to achieve a moisture content of 12%, which is required to produce CLT panels according to European standards. The addition of a strengthening material, glass fibre mesh produces a novel product for the construction industry while improving a CLT panels overall performance in bending and shear, examined through a 4-point bending test. The research also focuses on finding the most suitable way of incorporating the glass fibre mesh between the bottom two layers of CLT panels with various adhesive techniques, examined through shear tests.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46312921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-10DOI: 10.1080/24705314.2023.2233812
M. Shah, M. Usman, R. A. Khushnood, A. Hanif
ABSTRACT The present study investigated concrete durability problems at the National University of Sciences and Technology,Pakistan, through comprehensive analysis and non-destructive testing. During the visual inspection of concrete structures, different deterioration mechanisms such as alkali-silica aggregate reaction (ASR), carbonation, abrasion and drying shrinkage were found. After visual inspection, the data on ingredients used in the construction of various structures were collected, revealingthat different brands of cement used in construction contained high alkali-equivalent content. Fine aggregates were used from two different quarries during construction. The available literature and X-ray Diffraction (XRD) results showed that both the quarries’ aggregates have the potential for alkali-silica reactivity. Furthermore, the XRD results of gel-type material collected from mapped cracking indicated the presence of delhayelite, similar to alkali-silica gel, suggesting ASR. The XRD curves of the whitest powder collected from various sites showed the presence of sodium sulfate and calcium carbonate peaks, indicating salt hydration attacks. The carbonation rate in concrete ranges from 4.33 to 5.77 mm/year. The results of the rebound hammer and pulse velocity test indicated that concrete used in parking has low strength which is the main cause of abrasion. Based on these findings a few recommendations have been presented to avoid durability-related problems in future structures.
{"title":"Diagnosis of durability-related problems in concrete structures through comprehensive analysis and non-destructive testing: a case study","authors":"M. Shah, M. Usman, R. A. Khushnood, A. Hanif","doi":"10.1080/24705314.2023.2233812","DOIUrl":"https://doi.org/10.1080/24705314.2023.2233812","url":null,"abstract":"ABSTRACT The present study investigated concrete durability problems at the National University of Sciences and Technology,Pakistan, through comprehensive analysis and non-destructive testing. During the visual inspection of concrete structures, different deterioration mechanisms such as alkali-silica aggregate reaction (ASR), carbonation, abrasion and drying shrinkage were found. After visual inspection, the data on ingredients used in the construction of various structures were collected, revealingthat different brands of cement used in construction contained high alkali-equivalent content. Fine aggregates were used from two different quarries during construction. The available literature and X-ray Diffraction (XRD) results showed that both the quarries’ aggregates have the potential for alkali-silica reactivity. Furthermore, the XRD results of gel-type material collected from mapped cracking indicated the presence of delhayelite, similar to alkali-silica gel, suggesting ASR. The XRD curves of the whitest powder collected from various sites showed the presence of sodium sulfate and calcium carbonate peaks, indicating salt hydration attacks. The carbonation rate in concrete ranges from 4.33 to 5.77 mm/year. The results of the rebound hammer and pulse velocity test indicated that concrete used in parking has low strength which is the main cause of abrasion. Based on these findings a few recommendations have been presented to avoid durability-related problems in future structures.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42946172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-06DOI: 10.1080/24705314.2023.2230398
Ramin Ghiasi, A. Malekjafarian
ABSTRACT Feature Selection (FS) is an important step in data-driven structural health monitoring approaches. In this paper, an Advanced version of the Binary Slime Mould Algorithm (ABSMA) is introduced for feature subset selection to improve the performance of structural damage classification techniques. Two operators of mutation and crossover are embedded to the algorithm, to overcome the stagnation situation involved in the Binary Slime Mould Algorithm (BSMA). The proposed ABSMA is then embedded in a new data-driven SHM framework which consists of three main steps. In the first step, structural time domain responses are collected and pre-processed to extract the statistical features. In the second step, the order of the extracted features is reduced using an optimization algorithm to find a minimal subset of salient features by removing irrelevant, and redundant data. Finally, the optimized feature vectors are used as inputs to Neural Network (NN) based classification models. Benchmark datasets of a timber bridge model and a three-story frame structure are employed to validate the proposed algorithm. The results show that the proposed ABSMA provides a better performance and convergence rate compared to other commonly used binary optimization algorithms.
{"title":"Feature subset selection in structural health monitoring data using an advanced binary slime mould algorithm","authors":"Ramin Ghiasi, A. Malekjafarian","doi":"10.1080/24705314.2023.2230398","DOIUrl":"https://doi.org/10.1080/24705314.2023.2230398","url":null,"abstract":"ABSTRACT Feature Selection (FS) is an important step in data-driven structural health monitoring approaches. In this paper, an Advanced version of the Binary Slime Mould Algorithm (ABSMA) is introduced for feature subset selection to improve the performance of structural damage classification techniques. Two operators of mutation and crossover are embedded to the algorithm, to overcome the stagnation situation involved in the Binary Slime Mould Algorithm (BSMA). The proposed ABSMA is then embedded in a new data-driven SHM framework which consists of three main steps. In the first step, structural time domain responses are collected and pre-processed to extract the statistical features. In the second step, the order of the extracted features is reduced using an optimization algorithm to find a minimal subset of salient features by removing irrelevant, and redundant data. Finally, the optimized feature vectors are used as inputs to Neural Network (NN) based classification models. Benchmark datasets of a timber bridge model and a three-story frame structure are employed to validate the proposed algorithm. The results show that the proposed ABSMA provides a better performance and convergence rate compared to other commonly used binary optimization algorithms.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48726977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-03DOI: 10.1080/24705314.2023.2230399
R. Corbally, A. Malekjafarian
ABSTRACT Drive-by bridge condition monitoring, using in-vehicle sensors to monitor bridges, represents a potential solution for network-scale monitoring of bridge structures. This paper presents a proof of concept for using the vehicle contact-point (CP) response for drive-by condition monitoring of bridges. An expression is presented which allows the vibration response at the point of contact between the tyre and the bridge surface to be inferred from the in-vehicle measurements. Following a simple numerical demonstration of the concept, laboratory tests are undertaken to verify that the CP response can be used to detect the fundamental frequency of the bridge. Results show that the CP response can be used to identify the bridge frequency with greater certainty than the signals measured directly on the vehicle. It is also shown, for two simulated damage cases, that changes in bridge frequency can be detected. The CP response is seen to be more sensitive to changes in bridge frequency than the measured signals. It is also observed that the detected frequency is sensitive to the vehicle speed and mass, which is an important consideration when combining results from multiple vehicle passages. Overall, the results verify that the CP response can be used to enhance drive-by bridge monitoring regimes.
{"title":"Detecting changes in the structural behaviour of a laboratory bridge model using the contact-point response of a passing vehicle","authors":"R. Corbally, A. Malekjafarian","doi":"10.1080/24705314.2023.2230399","DOIUrl":"https://doi.org/10.1080/24705314.2023.2230399","url":null,"abstract":"ABSTRACT Drive-by bridge condition monitoring, using in-vehicle sensors to monitor bridges, represents a potential solution for network-scale monitoring of bridge structures. This paper presents a proof of concept for using the vehicle contact-point (CP) response for drive-by condition monitoring of bridges. An expression is presented which allows the vibration response at the point of contact between the tyre and the bridge surface to be inferred from the in-vehicle measurements. Following a simple numerical demonstration of the concept, laboratory tests are undertaken to verify that the CP response can be used to detect the fundamental frequency of the bridge. Results show that the CP response can be used to identify the bridge frequency with greater certainty than the signals measured directly on the vehicle. It is also shown, for two simulated damage cases, that changes in bridge frequency can be detected. The CP response is seen to be more sensitive to changes in bridge frequency than the measured signals. It is also observed that the detected frequency is sensitive to the vehicle speed and mass, which is an important consideration when combining results from multiple vehicle passages. Overall, the results verify that the CP response can be used to enhance drive-by bridge monitoring regimes.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45760094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-03DOI: 10.1080/24705314.2023.2233802
K. El Mekari, F. Duhaime, A. Shafaei
ABSTRACT Polymer injections in concrete fractures are commonly used for the waterproofing of tunnels. The pressure during the injection needs to be high enough to ensure polymer penetrability. This paper introduces two physical models for the study of the pressure inside concrete fractures during polymer injections. The injection parameters that were varied include pressure, injection duration, injection volume, location of the injection and pressure reading ports, and fluid dynamic viscosity. Water and water-glycerol mixtures were used to verify the influence of viscosity on flow. Tests were performed with both open and sealed fractures. The pressure inside the fracture during the injection was influenced by the dynamic viscosity, boundary conditions and the saturation level of the fracture. Sealed and initially moist fractures led to a higher pressure gain inside the fracture after achieving saturation. More than 40% of the injection pressure was already lost when the liquid entered the model. A numerical model of liquid flow in the fracture plane was developed with the finite element code COMSOL Multiphysics. It was able to replicate the influence of boundary conditions and initial fracture saturation on pressure. The model also shows how aperture and roughness influence the flow conditions in the fracture.
{"title":"Physical and numerical models of pressure during waterproofing injections with polymer into concrete fractures","authors":"K. El Mekari, F. Duhaime, A. Shafaei","doi":"10.1080/24705314.2023.2233802","DOIUrl":"https://doi.org/10.1080/24705314.2023.2233802","url":null,"abstract":"ABSTRACT Polymer injections in concrete fractures are commonly used for the waterproofing of tunnels. The pressure during the injection needs to be high enough to ensure polymer penetrability. This paper introduces two physical models for the study of the pressure inside concrete fractures during polymer injections. The injection parameters that were varied include pressure, injection duration, injection volume, location of the injection and pressure reading ports, and fluid dynamic viscosity. Water and water-glycerol mixtures were used to verify the influence of viscosity on flow. Tests were performed with both open and sealed fractures. The pressure inside the fracture during the injection was influenced by the dynamic viscosity, boundary conditions and the saturation level of the fracture. Sealed and initially moist fractures led to a higher pressure gain inside the fracture after achieving saturation. More than 40% of the injection pressure was already lost when the liquid entered the model. A numerical model of liquid flow in the fracture plane was developed with the finite element code COMSOL Multiphysics. It was able to replicate the influence of boundary conditions and initial fracture saturation on pressure. The model also shows how aperture and roughness influence the flow conditions in the fracture.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46416212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-19DOI: 10.1080/24705314.2023.2220946
B. Ghanbari, M. Fathi, A. Akhaveissy
ABSTRACT A reinforced concrete (RC)/steel vertical hybrid frame structure usually consists of a lower concrete structure and an upper steel structure connected in series. This study aims to derive fragility curves for RC/steel vertical hybrid frame structures under mainshock–aftershock sequences. For this purpose, a double incremental dynamic analysis (D-IDA) approach is performed to derive fragility curves for a five-story RC/steel vertical hybrid frame (a three‐story RC frame at the bottom + a two‐story steel frame at the top) under 14 real mainshock– aftershock earthquake ground motions. The fragility curves obtained for RC/steel frame are also compared with fragility curves for a five‐story purely RC frame. Also, residual capacity diagrams are provided for RC/steel and purely RC frames based on the D-IDA results. The results show that RC/steel frame structure has larger collapse capacity than that of the purely RC frame structure, and can diminish collapse probability by 33% compared to purely RC frame structure.
{"title":"Fragility curves for reinforced concrete (RC)/steel vertical hybrid frame structure under mainshock–aftershock sequences","authors":"B. Ghanbari, M. Fathi, A. Akhaveissy","doi":"10.1080/24705314.2023.2220946","DOIUrl":"https://doi.org/10.1080/24705314.2023.2220946","url":null,"abstract":"ABSTRACT A reinforced concrete (RC)/steel vertical hybrid frame structure usually consists of a lower concrete structure and an upper steel structure connected in series. This study aims to derive fragility curves for RC/steel vertical hybrid frame structures under mainshock–aftershock sequences. For this purpose, a double incremental dynamic analysis (D-IDA) approach is performed to derive fragility curves for a five-story RC/steel vertical hybrid frame (a three‐story RC frame at the bottom + a two‐story steel frame at the top) under 14 real mainshock– aftershock earthquake ground motions. The fragility curves obtained for RC/steel frame are also compared with fragility curves for a five‐story purely RC frame. Also, residual capacity diagrams are provided for RC/steel and purely RC frames based on the D-IDA results. The results show that RC/steel frame structure has larger collapse capacity than that of the purely RC frame structure, and can diminish collapse probability by 33% compared to purely RC frame structure.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44484425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-22DOI: 10.1080/24705314.2023.2211850
A. Alyaseen, Arunava Poddar, Hussain Alahmad, Navsal Kumar, P. Sihag
ABSTRACT The technological advancements and environmental concerns enlighten the importance of incorporating more high-performance engineered materials in the construction sector. The partial replacement of natural coarse aggregates (NCA) with recycled coarse aggregates (RCA) in concrete has recently been a primary focus of worldwide researchers for sustainability in environmental aspects. The primary purpose of this review is to comprehend the effect of design parameters in determining the mechanical characteristics of high-performance self-compacting (HP-SCC) that include recycled coarse aggregates (RCA). Seven design parameters were extracted and considered in this review. It has been revealed that the design parameters of HP-SCC with RCA have a different effect on the mechanical characteristics of HP-SCC with various grades. In addition, the current research aims to promote environmental-friendly development and produce sustainable materials to improve mechanical-related characteristics in concrete in the absence of a precise evaluation technique. Artificial neural network (ANN) models have been implemented using the design parameters for predicting concrete mechanical properties based on three statistical indicators. The ANN-based model was attributed using these seven inputs of the literature with the help of sensitivity analysis for indicating the most critical design parameter HP-SCC.
{"title":"High-performance self-compacting concrete with recycled coarse aggregate: comprehensive systematic review on mix design parameters","authors":"A. Alyaseen, Arunava Poddar, Hussain Alahmad, Navsal Kumar, P. Sihag","doi":"10.1080/24705314.2023.2211850","DOIUrl":"https://doi.org/10.1080/24705314.2023.2211850","url":null,"abstract":"ABSTRACT The technological advancements and environmental concerns enlighten the importance of incorporating more high-performance engineered materials in the construction sector. The partial replacement of natural coarse aggregates (NCA) with recycled coarse aggregates (RCA) in concrete has recently been a primary focus of worldwide researchers for sustainability in environmental aspects. The primary purpose of this review is to comprehend the effect of design parameters in determining the mechanical characteristics of high-performance self-compacting (HP-SCC) that include recycled coarse aggregates (RCA). Seven design parameters were extracted and considered in this review. It has been revealed that the design parameters of HP-SCC with RCA have a different effect on the mechanical characteristics of HP-SCC with various grades. In addition, the current research aims to promote environmental-friendly development and produce sustainable materials to improve mechanical-related characteristics in concrete in the absence of a precise evaluation technique. Artificial neural network (ANN) models have been implemented using the design parameters for predicting concrete mechanical properties based on three statistical indicators. The ANN-based model was attributed using these seven inputs of the literature with the help of sensitivity analysis for indicating the most critical design parameter HP-SCC.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43006501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-20DOI: 10.1080/24705314.2023.2170620
Oveys Ghodousian, Reyes Garcia, Vahid Shafaie, A. Ghodousian
ABSTRACT This study investigates experimentally and analytically the interfacial bond strength of coloured SCC repair layers. Ten SCC mixes with 5%, 10% and 15% of blue, green or red pigments were produced to examine their fresh properties. Subsequently, 60 coloured SCC specimens were tested to assess interfacial bond strength using pull-off and push-out tests. The results confirm that pigments reduce the mechanical properties of SCC and its bond strength to concrete substrates, with red pigment reducing (by up to 41%) interfacial bond strength. It is shown that the push-out test is effective to determine the interfacial shear bond strength between the SCC repair layers and substrates. A GNNC-Modified PSO algorithm is proposed to calculate accurately (R2 = 0.95) the interfacial bond strength of coloured SCC repair layers. This study contributes towards developing more effective test methods and more accurate models to calculate interfacial bond strength of the SCC repair layers used in this study.
{"title":"Interfacial bond strength of coloured SCC repair layers: an experimental and optimisation study","authors":"Oveys Ghodousian, Reyes Garcia, Vahid Shafaie, A. Ghodousian","doi":"10.1080/24705314.2023.2170620","DOIUrl":"https://doi.org/10.1080/24705314.2023.2170620","url":null,"abstract":"ABSTRACT This study investigates experimentally and analytically the interfacial bond strength of coloured SCC repair layers. Ten SCC mixes with 5%, 10% and 15% of blue, green or red pigments were produced to examine their fresh properties. Subsequently, 60 coloured SCC specimens were tested to assess interfacial bond strength using pull-off and push-out tests. The results confirm that pigments reduce the mechanical properties of SCC and its bond strength to concrete substrates, with red pigment reducing (by up to 41%) interfacial bond strength. It is shown that the push-out test is effective to determine the interfacial shear bond strength between the SCC repair layers and substrates. A GNNC-Modified PSO algorithm is proposed to calculate accurately (R2 = 0.95) the interfacial bond strength of coloured SCC repair layers. This study contributes towards developing more effective test methods and more accurate models to calculate interfacial bond strength of the SCC repair layers used in this study.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49050477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-19DOI: 10.1080/24705314.2023.2176619
Sudip Chowdhury, Arnab Banerjee, S. Adhikari
ABSTRACT The inertial amplifier viscoelastic base isolators (IAVBI) are introduced in this paper. The viscoelastic materials are implanted inside the core material of the inertial amplifier base isolators. The standard linear solid (SLS) models are applied to formulate the viscoelastic material mathematically. The viscoelastic materials are also implanted inside the traditional base isolators to enhance their dynamic response reduction capacity. The optimal dynamic responses of structures controlled by novel viscoelastic base isolators are derived analytically. The exact closed-form expressions for optimal design parameters of novel viscoelastic base isolators for structures are derived using and optimization methods. The feasibility of these optimal design parameters has been tested by frequency domain analysis. The optimal dynamic response reduction capacity of inertial amplifier viscoelastic base isolators has been determined to investigate the robustness of the and optimized design parameters. The closed-form expressions for optimal design parameters of novel base isolators are mathematically correct and effective for design purposes.
{"title":"The optimum inertial amplifier viscoelastic base isolators for dynamic response mitigation of structures: an analytical study","authors":"Sudip Chowdhury, Arnab Banerjee, S. Adhikari","doi":"10.1080/24705314.2023.2176619","DOIUrl":"https://doi.org/10.1080/24705314.2023.2176619","url":null,"abstract":"ABSTRACT The inertial amplifier viscoelastic base isolators (IAVBI) are introduced in this paper. The viscoelastic materials are implanted inside the core material of the inertial amplifier base isolators. The standard linear solid (SLS) models are applied to formulate the viscoelastic material mathematically. The viscoelastic materials are also implanted inside the traditional base isolators to enhance their dynamic response reduction capacity. The optimal dynamic responses of structures controlled by novel viscoelastic base isolators are derived analytically. The exact closed-form expressions for optimal design parameters of novel viscoelastic base isolators for structures are derived using and optimization methods. The feasibility of these optimal design parameters has been tested by frequency domain analysis. The optimal dynamic response reduction capacity of inertial amplifier viscoelastic base isolators has been determined to investigate the robustness of the and optimized design parameters. The closed-form expressions for optimal design parameters of novel base isolators are mathematically correct and effective for design purposes.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47819473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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