Pub Date : 2023-10-16DOI: 10.1080/24705314.2023.2267329
Mustafa Mahamid, Kamel Bilal, Cenk Tort
ABSTRACTComposite construction is advantageous due to the combination of steel and concrete materials in structural members. Composite column’s cross-section types such as hexagonal, octagonal, and decagonal and high diameter-to-thickness (D/t) ratios are highly desirable in transmission towers, yet not covered in the applicable codes. Therefore, the objective of this study is to investigate the behavior of composite columns with various characteristics including cross-section types, and height and propose a design procedure based on Force – Moment (P-M) Interaction diagrams and related equations. Three-dimensional non-linear finite element models were developed using a nonlinear finite element software to simulate and verify the behavior of the composite towers against prior experimental work. Concrete Damage Plasticity and Steel Bilinear Elasto-Plastic Model were calibrated and used in capturing the realistic nonlinear behavior of the materials and their interaction. Based on the computational models, a concrete reduction factor, needed for the development of design equations, was derived. Conclusively, typical normalized P-M Interaction diagrams were constructed for various polygonal shapes with high D/t ratios beyond code limitations. The corresponding derived design equations play a significant role in the applicability of the composite columns in transmission towers.KEYWORDS: Compositeconcrete damage plasticitynonlinear analysistransmission towersP-M diagrams List of symbols used in the manuscript Symbol=Descriptionγ=concrete strength reduction factorE=Modulus of Elasticityν=Poisson’s ratiof’c=Concrete Compressive Strengthɛ=Strainσ=StressKc=Shape of the yield surfacefbo=Initial biaxial compressive yield stressfco=Initial uniaxial compressive yield stressr=Total section radiusrc=Concrete section radiusd=Outer depth of the sectiondc=Inner depth of the sectiont=Steel section thicknessAs=Steel section areaFy=Yield stressZ=Section modulush=Distance from top of the section to depthDisclosure statementNo potential conflict of interest was reported by the author(s).
{"title":"Behavior and design of multi-sided composite sections","authors":"Mustafa Mahamid, Kamel Bilal, Cenk Tort","doi":"10.1080/24705314.2023.2267329","DOIUrl":"https://doi.org/10.1080/24705314.2023.2267329","url":null,"abstract":"ABSTRACTComposite construction is advantageous due to the combination of steel and concrete materials in structural members. Composite column’s cross-section types such as hexagonal, octagonal, and decagonal and high diameter-to-thickness (D/t) ratios are highly desirable in transmission towers, yet not covered in the applicable codes. Therefore, the objective of this study is to investigate the behavior of composite columns with various characteristics including cross-section types, and height and propose a design procedure based on Force – Moment (P-M) Interaction diagrams and related equations. Three-dimensional non-linear finite element models were developed using a nonlinear finite element software to simulate and verify the behavior of the composite towers against prior experimental work. Concrete Damage Plasticity and Steel Bilinear Elasto-Plastic Model were calibrated and used in capturing the realistic nonlinear behavior of the materials and their interaction. Based on the computational models, a concrete reduction factor, needed for the development of design equations, was derived. Conclusively, typical normalized P-M Interaction diagrams were constructed for various polygonal shapes with high D/t ratios beyond code limitations. The corresponding derived design equations play a significant role in the applicability of the composite columns in transmission towers.KEYWORDS: Compositeconcrete damage plasticitynonlinear analysistransmission towersP-M diagrams List of symbols used in the manuscript Symbol=Descriptionγ=concrete strength reduction factorE=Modulus of Elasticityν=Poisson’s ratiof’c=Concrete Compressive Strengthɛ=Strainσ=StressKc=Shape of the yield surfacefbo=Initial biaxial compressive yield stressfco=Initial uniaxial compressive yield stressr=Total section radiusrc=Concrete section radiusd=Outer depth of the sectiondc=Inner depth of the sectiont=Steel section thicknessAs=Steel section areaFy=Yield stressZ=Section modulush=Distance from top of the section to depthDisclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"234 2 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":"136113837","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 : 2023-09-25DOI: 10.1080/24705314.2023.2262249
Harendra Yadav, Shashikant Kumar, Baboo Rai
ABSTRACTHigh-performance concrete (HPC) is currently widely utilised in the civil engineering and construction industry. The rising use of HPC in structural applications, as well as the necessity to justify fire resistance, has prompted numerous laboratories to research high-temperature characteristics. The relevant properties of HPC with polypropylene fiber (PPF) and fly ash (FA) were determined through an experimental study. This paper presents some key aspects related to compressive strength for High-Performance Fiber Reinforced Concrete (HPFRC) with and without FA at high temperatures ranging from 100°C to 800°C for use in fire resistance calculations. Visual investigation revealed a change in colour as the temperature rose. It may be used as a guide for maintaining, designing, and predicting the life of HPC structures, such as high-rise buildings that are exposed to high temperatures. Detailed research on the mechanical and durability characteristics like the workability of fresh concrete, as well as compressive strength, modulus of elasticity, drying shrinkage, water permeability, and sorptivity coefficient of hardened concrete containing PPF and FA is also reported in this paper. FA concentration in concrete mixtures was 0%, 10%, 20%, 30%, and 40% on a mass basis, with fibre volume fraction ranging from 0% to 0.3% on a volume basis.KEYWORDS: High-performance fiber reinforced concretepolypropylene fiberfly ashdrying shrinkagewater permeabilitysorptivity Disclosure statementNo potential conflict of interest was reported by the author(s).
{"title":"Durability and fire resistance of high-performance fiber reinforced concrete with fly ash","authors":"Harendra Yadav, Shashikant Kumar, Baboo Rai","doi":"10.1080/24705314.2023.2262249","DOIUrl":"https://doi.org/10.1080/24705314.2023.2262249","url":null,"abstract":"ABSTRACTHigh-performance concrete (HPC) is currently widely utilised in the civil engineering and construction industry. The rising use of HPC in structural applications, as well as the necessity to justify fire resistance, has prompted numerous laboratories to research high-temperature characteristics. The relevant properties of HPC with polypropylene fiber (PPF) and fly ash (FA) were determined through an experimental study. This paper presents some key aspects related to compressive strength for High-Performance Fiber Reinforced Concrete (HPFRC) with and without FA at high temperatures ranging from 100°C to 800°C for use in fire resistance calculations. Visual investigation revealed a change in colour as the temperature rose. It may be used as a guide for maintaining, designing, and predicting the life of HPC structures, such as high-rise buildings that are exposed to high temperatures. Detailed research on the mechanical and durability characteristics like the workability of fresh concrete, as well as compressive strength, modulus of elasticity, drying shrinkage, water permeability, and sorptivity coefficient of hardened concrete containing PPF and FA is also reported in this paper. FA concentration in concrete mixtures was 0%, 10%, 20%, 30%, and 40% on a mass basis, with fibre volume fraction ranging from 0% to 0.3% on a volume basis.KEYWORDS: High-performance fiber reinforced concretepolypropylene fiberfly ashdrying shrinkagewater permeabilitysorptivity Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135771108","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 : 2023-09-22DOI: 10.1080/24705314.2023.2259721
Md. Rajbanul Akhond, Ahmad Irfan, Ahmed Sharif
ABSTRACTThe corrosion of reinforcement possesses a huge problem for our present infrastructure both in terms of human lives and monetary ground. Understanding the corrosion of thermomechanically treated (TMT) rebar in concrete structures is essential as it represents a large segment of reinforcement materials. In this review, we have tried to scrutinize this issue from different directions. The established corrosion model for rebar, especially for TMT rebar, has been examined. The main contributing factor for rebar corrosion is how passivation occurs and its disintegration in contact with aggressive ions. The effects of composition, microstructure, concrete-rebar interface, concrete type, and corrosion media on this phenomenon have been analyzed. We have realized that the exact time of chloride ion attack determines the effectiveness of the passive layer in inhabiting the corrosion initiation. A combination of suitable alloying and controlled thermomechanical treatment ensures corrosion resistant rebar. Concrete also plays an important role in corrosion prevention as it helps passivation step and stops aggressive ions from reaching the rebars. Finally, we have discussed some recent trends in corrosion management technologies and their effectiveness.KEYWORDS: CorrosionTMT rebarreinforcementRCC structuresthermo-mechanical treatmentpassivation AcknowledgmentsThe authors would like to thank the Bangladesh University of Engineering and Technology (BUET) for providing assistance with different facilities. One of the authors, A. Irfan extends his appreciation to the Deanship of Scientific Research at King Khalid University Saudi Arabia for funding this work through Large Research Group Project under grant number (RGP/2/63/44).Disclosure statementNo potential conflict of interest was reported by the author(s).CRediT authorship contribution statementMd. Rajbanul Akhond: Conceptualization, Methodology, Formal analysis Writing – original draft. Ahmad Irfan: Formal analysis, Writing – review & editing. Ahmed Sharif: Conceptualization, Methodology, Writing – review & editing, Resources, Supervision.
{"title":"An overview of corrosion behavior and contemporary management techniques of thermomechanically treated rebars in concrete structures","authors":"Md. Rajbanul Akhond, Ahmad Irfan, Ahmed Sharif","doi":"10.1080/24705314.2023.2259721","DOIUrl":"https://doi.org/10.1080/24705314.2023.2259721","url":null,"abstract":"ABSTRACTThe corrosion of reinforcement possesses a huge problem for our present infrastructure both in terms of human lives and monetary ground. Understanding the corrosion of thermomechanically treated (TMT) rebar in concrete structures is essential as it represents a large segment of reinforcement materials. In this review, we have tried to scrutinize this issue from different directions. The established corrosion model for rebar, especially for TMT rebar, has been examined. The main contributing factor for rebar corrosion is how passivation occurs and its disintegration in contact with aggressive ions. The effects of composition, microstructure, concrete-rebar interface, concrete type, and corrosion media on this phenomenon have been analyzed. We have realized that the exact time of chloride ion attack determines the effectiveness of the passive layer in inhabiting the corrosion initiation. A combination of suitable alloying and controlled thermomechanical treatment ensures corrosion resistant rebar. Concrete also plays an important role in corrosion prevention as it helps passivation step and stops aggressive ions from reaching the rebars. Finally, we have discussed some recent trends in corrosion management technologies and their effectiveness.KEYWORDS: CorrosionTMT rebarreinforcementRCC structuresthermo-mechanical treatmentpassivation AcknowledgmentsThe authors would like to thank the Bangladesh University of Engineering and Technology (BUET) for providing assistance with different facilities. One of the authors, A. Irfan extends his appreciation to the Deanship of Scientific Research at King Khalid University Saudi Arabia for funding this work through Large Research Group Project under grant number (RGP/2/63/44).Disclosure statementNo potential conflict of interest was reported by the author(s).CRediT authorship contribution statementMd. Rajbanul Akhond: Conceptualization, Methodology, Formal analysis Writing – original draft. Ahmad Irfan: Formal analysis, Writing – review & editing. Ahmed Sharif: Conceptualization, Methodology, Writing – review & editing, Resources, Supervision.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136062000","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 : 2023-09-13DOI: 10.1080/24705314.2023.2254990
Hamed Farhangian, Niloufar Ghazanfari, Farnam Ghasemzadeh, Mohammad Shekarchi
In this paper, a set of concrete beams with different cementitious binders are designed and tested to investigate the time-dependent deflection of concrete beams subjected to flexural load over a period of 1 year. Test parameters mainly included the effect of cementitious binders (silica fume (SF), ground-granulated blast-furnace slag (GGBS), and a combination of SF and GGBS), and polypropylene fibers on the time-dependent deflection of concrete. The specimens used in this study are under drying/unsealed conditions. The drying condition was designed to obtain the combination of the creep and the shrinkage that occurred in the common practice of construction. One of the most important problems in the repair of flexural members of concrete structures is the problem of creep and shrinkage, which is a relatively unknown problem in the literature. Furthermore, the experimental results are selected to validate the proposed models. Prediction of time-dependent deflections under flexural loading is proposed by the inverse analysis (IA) method. Based on the results, in comparison to the control specimen, the long-term deflection increases of 5.9% and decreases of 22.1% and 43.2% for specimens containing GGBS, SF and a combination of SF and GGBS, respectively, at the test age of 383 days.
{"title":"Long-term flexural performance of concrete beams with different pozzolanic materials: experimental and analytical study","authors":"Hamed Farhangian, Niloufar Ghazanfari, Farnam Ghasemzadeh, Mohammad Shekarchi","doi":"10.1080/24705314.2023.2254990","DOIUrl":"https://doi.org/10.1080/24705314.2023.2254990","url":null,"abstract":"In this paper, a set of concrete beams with different cementitious binders are designed and tested to investigate the time-dependent deflection of concrete beams subjected to flexural load over a period of 1 year. Test parameters mainly included the effect of cementitious binders (silica fume (SF), ground-granulated blast-furnace slag (GGBS), and a combination of SF and GGBS), and polypropylene fibers on the time-dependent deflection of concrete. The specimens used in this study are under drying/unsealed conditions. The drying condition was designed to obtain the combination of the creep and the shrinkage that occurred in the common practice of construction. One of the most important problems in the repair of flexural members of concrete structures is the problem of creep and shrinkage, which is a relatively unknown problem in the literature. Furthermore, the experimental results are selected to validate the proposed models. Prediction of time-dependent deflections under flexural loading is proposed by the inverse analysis (IA) method. Based on the results, in comparison to the control specimen, the long-term deflection increases of 5.9% and decreases of 22.1% and 43.2% for specimens containing GGBS, SF and a combination of SF and GGBS, respectively, at the test age of 383 days.","PeriodicalId":43844,"journal":{"name":"Journal of Structural Integrity and Maintenance","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135740613","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 : 2023-09-04DOI: 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":" ","pages":""},"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":" ","pages":""},"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":"1 1","pages":""},"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":" ","pages":""},"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":" ","pages":""},"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":"8 1","pages":"188 - 197"},"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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：