Pub Date : 2021-12-16DOI: 10.1080/13287982.2021.1989167
A. Sravan Ashwin, A. P, Sreenivasan M.K, S. Rahima Shabeen
ABSTRACT This paper presents a review of the various seismic energy dissipation devices and practices used in recent times. This agenda of discussion is imperative as natural catastrophes, particularly earthquakes are known to be very disastrous. These methodologies have been known to improve structural resilience for the same and therefore proving that investigation on the same would be beneficial in enhancing the safety of structures. This paper has a culmination of research articles published between 2014–2019. Particular focus is given to dampers, damper based hybrid systems as well as the application of dampers in hybrid base isolation systems and in precast connection systems.With the research presented in this paper, there is scope for further investigation and the pragmatic application of the same.
{"title":"SEISMIC ENERGY DISSIPATION SYSTEMS – a REVIEW","authors":"A. Sravan Ashwin, A. P, Sreenivasan M.K, S. Rahima Shabeen","doi":"10.1080/13287982.2021.1989167","DOIUrl":"https://doi.org/10.1080/13287982.2021.1989167","url":null,"abstract":"ABSTRACT This paper presents a review of the various seismic energy dissipation devices and practices used in recent times. This agenda of discussion is imperative as natural catastrophes, particularly earthquakes are known to be very disastrous. These methodologies have been known to improve structural resilience for the same and therefore proving that investigation on the same would be beneficial in enhancing the safety of structures. This paper has a culmination of research articles published between 2014–2019. Particular focus is given to dampers, damper based hybrid systems as well as the application of dampers in hybrid base isolation systems and in precast connection systems.With the research presented in this paper, there is scope for further investigation and the pragmatic application of the same.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77926912","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 : 2021-11-21DOI: 10.1080/13287982.2021.1999010
S.M. Hosseini, F. Mashiri, O. Mirza
ABSTRACT A computer-aided engineering (CAE) fatigue life prediction technique is developed in this paper to determine the fatigue strength of bolted shear connectors in composite structures. A relatively new initiative in the composite construction industry is the use of the blind boltshear connector, which provides a sustainable and practical solution to the main limitation of using traditional welded stud regarding reuse of building components. Furthermore, fatigue is one of the major causes involved in fatal mechanical failures of composite structures. However, limited research has been currently undertaken to assess fatigue life of composite structure. Therefore, the fatigue performance of the blind bolt under constant amplitudes cyclic loading has been investigated using ABAQUS/explicit and FE-SAFE programs. First, the dynamic responses of steel-concrete composite structures under sinusoidal load cycles were simulated using ABAQUS/explicit. Then, the stress–strain time history based on the response law of the composite structure was introduced into the FE-SAFE software to obtain a good prediction on the fatigue life of the blind bolt shear connector. As a result, the logarithmic life distributions of the bolted shear connector were calculated using different constant amplitudes.
{"title":"Fatigue performance of bolted shear connectors","authors":"S.M. Hosseini, F. Mashiri, O. Mirza","doi":"10.1080/13287982.2021.1999010","DOIUrl":"https://doi.org/10.1080/13287982.2021.1999010","url":null,"abstract":"ABSTRACT A computer-aided engineering (CAE) fatigue life prediction technique is developed in this paper to determine the fatigue strength of bolted shear connectors in composite structures. A relatively new initiative in the composite construction industry is the use of the blind boltshear connector, which provides a sustainable and practical solution to the main limitation of using traditional welded stud regarding reuse of building components. Furthermore, fatigue is one of the major causes involved in fatal mechanical failures of composite structures. However, limited research has been currently undertaken to assess fatigue life of composite structure. Therefore, the fatigue performance of the blind bolt under constant amplitudes cyclic loading has been investigated using ABAQUS/explicit and FE-SAFE programs. First, the dynamic responses of steel-concrete composite structures under sinusoidal load cycles were simulated using ABAQUS/explicit. Then, the stress–strain time history based on the response law of the composite structure was introduced into the FE-SAFE software to obtain a good prediction on the fatigue life of the blind bolt shear connector. As a result, the logarithmic life distributions of the bolted shear connector were calculated using different constant amplitudes.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75462302","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 : 2021-11-08DOI: 10.1080/13287982.2021.1998995
X. Feng, Fangfang Zhang, Lixia Guo, L. Zhong
ABSTRACT Cemented sand and gravel (CSG) is a kind of green building material that has emerged in recent years. The cement content has a great impact on the deformation characteristics of CSG, but the current constitutive models cannot reflect this problem. Based on the previous research results, this paper depicted the volume strain and shear strain of CSG, established a nonlinear constitutive model of CSG, and finally verified the new constitutive model with experimental data. Results showed that the model could well simulate the deformation characteristics of the CSG with cement content of more than 40 kg/m3, and the entire stress–strain relationship was basically consistent with the experimental value, reflecting the adaptability and superiority of the nonlinear constitutive model of CSG.
{"title":"A new nonlinear constitutive model of CSG","authors":"X. Feng, Fangfang Zhang, Lixia Guo, L. Zhong","doi":"10.1080/13287982.2021.1998995","DOIUrl":"https://doi.org/10.1080/13287982.2021.1998995","url":null,"abstract":"ABSTRACT Cemented sand and gravel (CSG) is a kind of green building material that has emerged in recent years. The cement content has a great impact on the deformation characteristics of CSG, but the current constitutive models cannot reflect this problem. Based on the previous research results, this paper depicted the volume strain and shear strain of CSG, established a nonlinear constitutive model of CSG, and finally verified the new constitutive model with experimental data. Results showed that the model could well simulate the deformation characteristics of the CSG with cement content of more than 40 kg/m3, and the entire stress–strain relationship was basically consistent with the experimental value, reflecting the adaptability and superiority of the nonlinear constitutive model of CSG.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75498358","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 : 2021-11-08DOI: 10.1080/13287982.2021.1999041
Le Li, M. Mahmoodian
ABSTRACT This paper proposes a new method to predict the failure of steel structures subjected to fatigue and corrosion. A model is developed to determine changes in S-N curve of beams (i.e., intact plates) and connections subjected to simultaneous corrosion and fatigue environment. The fatigue damages of beams and connections are then modelled as stochastic processes. The first-passage probability method is used to determine the time-dependent probability of fatigue failure of plates and connections, and then system reliability analysis is carried out for a steel structure as a working example. It has been found that ignoring corrosion effect on S-N curves for beams and connections can lead to underestimation of fatigue life of corroded steel structures. It has also been found that corroded connections can be more vulnerable to fatigue failure than beams. Apart from that, a risk cost optimisation programme is applied to the working example to find the maintenance strategies that ensure the safe operation of steel structures and intend to minimise the total risk. The methodology proposed in this paper can help structural engineers and asset managers on repair and maintenance of steel structures subjected to simultaneous corrosion and fatigue.
{"title":"FATIGUE LIFE PREDICTION AND MAINTAINANCE MANAGEMENT OF STEEL STRUCTURES SUBJECTED TO CORROSION","authors":"Le Li, M. Mahmoodian","doi":"10.1080/13287982.2021.1999041","DOIUrl":"https://doi.org/10.1080/13287982.2021.1999041","url":null,"abstract":"ABSTRACT This paper proposes a new method to predict the failure of steel structures subjected to fatigue and corrosion. A model is developed to determine changes in S-N curve of beams (i.e., intact plates) and connections subjected to simultaneous corrosion and fatigue environment. The fatigue damages of beams and connections are then modelled as stochastic processes. The first-passage probability method is used to determine the time-dependent probability of fatigue failure of plates and connections, and then system reliability analysis is carried out for a steel structure as a working example. It has been found that ignoring corrosion effect on S-N curves for beams and connections can lead to underestimation of fatigue life of corroded steel structures. It has also been found that corroded connections can be more vulnerable to fatigue failure than beams. Apart from that, a risk cost optimisation programme is applied to the working example to find the maintenance strategies that ensure the safe operation of steel structures and intend to minimise the total risk. The methodology proposed in this paper can help structural engineers and asset managers on repair and maintenance of steel structures subjected to simultaneous corrosion and fatigue.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89084949","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 : 2021-11-01DOI: 10.1080/13287982.2021.1997369
K. Parackal, J. Ginger, Joshua Eaton
ABSTRACT Recent damage surveys have shown that double-skillion roof houses, characterised by two monoslope roofslopes with a vertical ‘rise’ connecting the upper and lower roof slopes, are vulnerable to cladding and structural failures in windstorms. Wind loading Standards such as AS/NZS 1170.2 do not currently provide pressure coefficients for deriving design wind loads specifically for these types of double-skillion roofs. This paper presents a 1/50 scale wind tunnel model study on a typical double-skillion roof house. The study found that the upper roof slope experiences large suction pressures especially near the upwind corner for oblique approach winds. In addition, the lower roof slope and rise are subjected to large positive pressures. The structure (i.e. rafters) near the end-walls also experiences large hold-down loads. Cladding loads and rafter hold-down loads are significantly larger than values obtained from applying data currently available in AS/NZS 1170.2
{"title":"Wind loads on double-skillion roof houses","authors":"K. Parackal, J. Ginger, Joshua Eaton","doi":"10.1080/13287982.2021.1997369","DOIUrl":"https://doi.org/10.1080/13287982.2021.1997369","url":null,"abstract":"ABSTRACT Recent damage surveys have shown that double-skillion roof houses, characterised by two monoslope roofslopes with a vertical ‘rise’ connecting the upper and lower roof slopes, are vulnerable to cladding and structural failures in windstorms. Wind loading Standards such as AS/NZS 1170.2 do not currently provide pressure coefficients for deriving design wind loads specifically for these types of double-skillion roofs. This paper presents a 1/50 scale wind tunnel model study on a typical double-skillion roof house. The study found that the upper roof slope experiences large suction pressures especially near the upwind corner for oblique approach winds. In addition, the lower roof slope and rise are subjected to large positive pressures. The structure (i.e. rafters) near the end-walls also experiences large hold-down loads. Cladding loads and rafter hold-down loads are significantly larger than values obtained from applying data currently available in AS/NZS 1170.2","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81130584","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 : 2021-09-11DOI: 10.1080/13287982.2021.1970700
Liang Su, Jing-Quan Zhang, Yu-Nan Tang, Xin Huang
ABSTRACT An automatic Bayesian modal identification method is proposed using the blind source separation (BSS) technique. The determination of resonant frequency bands, which is the initial step of the fast Bayesian FFT (fast Fourier transform) method, requires human intervention and hence, is labour-intensive and subjective. To automate the determination of resonant frequency bands, the BSS technique is introduced here for band selection process. After estimating the modal responses from measured data, the hump criterion curves are drawn to sharpen the border of the resonant humps. And the frequency bands can thus be determined automatically by locating the resonant humps with a peak picking algorithm. The proposed method was validated with a simulated 6- degree-of-freedom spring-mass model, a simulated 4-story benchmark model, the Heritage Court Tower in Vancouver, Canada. The robust identification results indicate that the proposed method can identify automatically and accurately the physical modes together with their uncertainty.
{"title":"Automatic Bayesian modal identification method for structures based on blind source separation","authors":"Liang Su, Jing-Quan Zhang, Yu-Nan Tang, Xin Huang","doi":"10.1080/13287982.2021.1970700","DOIUrl":"https://doi.org/10.1080/13287982.2021.1970700","url":null,"abstract":"ABSTRACT An automatic Bayesian modal identification method is proposed using the blind source separation (BSS) technique. The determination of resonant frequency bands, which is the initial step of the fast Bayesian FFT (fast Fourier transform) method, requires human intervention and hence, is labour-intensive and subjective. To automate the determination of resonant frequency bands, the BSS technique is introduced here for band selection process. After estimating the modal responses from measured data, the hump criterion curves are drawn to sharpen the border of the resonant humps. And the frequency bands can thus be determined automatically by locating the resonant humps with a peak picking algorithm. The proposed method was validated with a simulated 6- degree-of-freedom spring-mass model, a simulated 4-story benchmark model, the Heritage Court Tower in Vancouver, Canada. The robust identification results indicate that the proposed method can identify automatically and accurately the physical modes together with their uncertainty.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88305024","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 : 2021-08-30DOI: 10.1080/13287982.2021.1970699
A. Awan, Faiz Shaikh
ABSTRACT This study presents the structural behaviour of tyre-bale sandwich wall under four-point bending and punching shear load. The research entails two stages: (a) full-scale experimental testing and (b) and numerical analysis of a 3D finite element modelling (FEM). In the first stage, two tyre-bale sandwich walls are tested experimentally in flexural bending to investigate the structural behaviour in terms of ultimate load, vertical deflection, strain distribution on the concrete surface, deflected profile, crack pattern and tyre-bale compressibility. The second stage consisted of three phases: (a) validation of the material model and assembly of different parts by comparing load-deflection curve and concrete damage in tension, (b) calibration of punching shear load and boundary conditions using previous experimental research data and (c) study ultimate load and failure mode under punching shear in tyre-bale sandwich wall. The results of the proposed 3D FEM model showed good agreement with experimental work and predicted the failure mechanism with reasonable accuracy. The calibrated model can be used to further investigate the factors affecting the structural behaviour of tyre-bale sandwich walls under different loading conditions. Finally, the strength of reinforced concrete member was confirmed using yield line theory, which showed a fair agreement with the experimental values.
{"title":"Experimental and numerical study on structural behaviour of tyre-bale sandwich wall under different loading conditions","authors":"A. Awan, Faiz Shaikh","doi":"10.1080/13287982.2021.1970699","DOIUrl":"https://doi.org/10.1080/13287982.2021.1970699","url":null,"abstract":"ABSTRACT This study presents the structural behaviour of tyre-bale sandwich wall under four-point bending and punching shear load. The research entails two stages: (a) full-scale experimental testing and (b) and numerical analysis of a 3D finite element modelling (FEM). In the first stage, two tyre-bale sandwich walls are tested experimentally in flexural bending to investigate the structural behaviour in terms of ultimate load, vertical deflection, strain distribution on the concrete surface, deflected profile, crack pattern and tyre-bale compressibility. The second stage consisted of three phases: (a) validation of the material model and assembly of different parts by comparing load-deflection curve and concrete damage in tension, (b) calibration of punching shear load and boundary conditions using previous experimental research data and (c) study ultimate load and failure mode under punching shear in tyre-bale sandwich wall. The results of the proposed 3D FEM model showed good agreement with experimental work and predicted the failure mechanism with reasonable accuracy. The calibrated model can be used to further investigate the factors affecting the structural behaviour of tyre-bale sandwich walls under different loading conditions. Finally, the strength of reinforced concrete member was confirmed using yield line theory, which showed a fair agreement with the experimental values.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84339963","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 : 2021-08-18DOI: 10.1080/13287982.2021.1962618
S. Gopinath, N. Iyer, R. Gettu
ABSTRACT Textile reinforced concrete (TRC) is a promising material for strengthening of reinforced concrete beams due to the possibility of customizing both textile and matrix to achieve the targeted strain hardening under tensile load. Considering the complexity involved in material behaviour of TRC, the independent material characteristics majorly influence the response of the strengthened system. Presently, simple mathematical prediction models for TRC strengthened systems are few. The objective of this paper is to propose a simplified non-iterative approach to predict the behavior of RC beams strengthened with TRC. The material response calibrated based on experimental data of RC and TRC is used to develop the model using two material properties and ten non-dimensional parameters. The material parameters are described using Young´s modulus and first-crack strain of TRC in addition to various non-dimensional parameters that define strain hardening of TRC, tensile strength of steel, compressive strength of concrete and ultimate strain levels. The strain hardening of TRC is accurately incorporated, and the appropriate failure criteria for the strengthened system are idealized. Curvature at a particular section is calculated by using strain values. Parametric studies revealed that the material nonlinearity is adequately addressed and salient stages of the strengthened system predicted till failure.
{"title":"Non-Iterative Model for Analysis of RC Beams Strengthened with Textile Reinforced Concrete","authors":"S. Gopinath, N. Iyer, R. Gettu","doi":"10.1080/13287982.2021.1962618","DOIUrl":"https://doi.org/10.1080/13287982.2021.1962618","url":null,"abstract":"ABSTRACT Textile reinforced concrete (TRC) is a promising material for strengthening of reinforced concrete beams due to the possibility of customizing both textile and matrix to achieve the targeted strain hardening under tensile load. Considering the complexity involved in material behaviour of TRC, the independent material characteristics majorly influence the response of the strengthened system. Presently, simple mathematical prediction models for TRC strengthened systems are few. The objective of this paper is to propose a simplified non-iterative approach to predict the behavior of RC beams strengthened with TRC. The material response calibrated based on experimental data of RC and TRC is used to develop the model using two material properties and ten non-dimensional parameters. The material parameters are described using Young´s modulus and first-crack strain of TRC in addition to various non-dimensional parameters that define strain hardening of TRC, tensile strength of steel, compressive strength of concrete and ultimate strain levels. The strain hardening of TRC is accurately incorporated, and the appropriate failure criteria for the strengthened system are idealized. Curvature at a particular section is calculated by using strain values. Parametric studies revealed that the material nonlinearity is adequately addressed and salient stages of the strengthened system predicted till failure.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77957434","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 : 2021-08-11DOI: 10.1080/13287982.2021.1964207
M. Shirinzadeh, A. Haghollahi, Hassan Gomar
ABSTRACT High potential for progressive collapse is one of the main weaknesses of structural frames with simple connections. Therefore, strengthening of this structural system is a necessity for both existing and new structures. In this study, the current simple connection with double web angles and one seat angle is modified by using dampers and a bracket-tendon system. The proposed methods of improvement increase the connection performance against progressive collapse due to column removal significantly, while they hardly change the stiffness and rigidity of the connections. Finite element software, ABAQUS, is used for this assessment. Vertical displacement of the modified connections after removal of the column is compared as an evaluation criterion. The results indicate that the bracket-tendon system is quite effective in reduction of vertical displacement of the connection up to 46%, and applying of dampers enhances the performance of the connections notably from 20% to 58%.
{"title":"Simple connections retrofitted by dampers and bracket-tendon system against progressive collapse","authors":"M. Shirinzadeh, A. Haghollahi, Hassan Gomar","doi":"10.1080/13287982.2021.1964207","DOIUrl":"https://doi.org/10.1080/13287982.2021.1964207","url":null,"abstract":"ABSTRACT High potential for progressive collapse is one of the main weaknesses of structural frames with simple connections. Therefore, strengthening of this structural system is a necessity for both existing and new structures. In this study, the current simple connection with double web angles and one seat angle is modified by using dampers and a bracket-tendon system. The proposed methods of improvement increase the connection performance against progressive collapse due to column removal significantly, while they hardly change the stiffness and rigidity of the connections. Finite element software, ABAQUS, is used for this assessment. Vertical displacement of the modified connections after removal of the column is compared as an evaluation criterion. The results indicate that the bracket-tendon system is quite effective in reduction of vertical displacement of the connection up to 46%, and applying of dampers enhances the performance of the connections notably from 20% to 58%.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88673660","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 : 2021-08-04DOI: 10.1080/13287982.2021.1962489
Enas Al-Faqra, Y. Murad, Mu'tasim Abdel Jaber, Nasim Shatarat
ABSTRACT The torsional behaviour of high-strength concrete beams that are transversely reinforced with continuous spiral reinforcement is experimentally investigated in this research. Seventeen specimens are divided into four groups according to their concrete strength: 25, 50, 60, and 70 MPa. Two types of transverse reinforcement, including closed and spiral stirrups, are used at a transverse spacing of 75 and 125 mm for each group. Test results are compared to the analytical values predicted using the ACI equation. Test results have shown an enhancement in the ultimate torsional capacity for the specimens made with high strength concrete compared to those made using normal strength concrete. The enhancement percentage ranges from 1.4% to 46.3%. In addition, results have shown an enhancement in the ultimate torsional capacity for specimens reinforced with spiral reinforcement compared to specimens made with conventional closed stirrups. The enhancement percentage varies from 8.3% to 34.6%. The study concluded that utilising continuous spiral reinforcement would result in higher ultimate torsional capacity than traditional closed stirrups for the same strength of concrete and that the torsion equations of ACI-318 M-19 are applicable and conservative for high strength concrete with a continuous spiral reinforcement.
{"title":"Torsional behaviour of high strength concrete beams with spiral reinforcement","authors":"Enas Al-Faqra, Y. Murad, Mu'tasim Abdel Jaber, Nasim Shatarat","doi":"10.1080/13287982.2021.1962489","DOIUrl":"https://doi.org/10.1080/13287982.2021.1962489","url":null,"abstract":"ABSTRACT The torsional behaviour of high-strength concrete beams that are transversely reinforced with continuous spiral reinforcement is experimentally investigated in this research. Seventeen specimens are divided into four groups according to their concrete strength: 25, 50, 60, and 70 MPa. Two types of transverse reinforcement, including closed and spiral stirrups, are used at a transverse spacing of 75 and 125 mm for each group. Test results are compared to the analytical values predicted using the ACI equation. Test results have shown an enhancement in the ultimate torsional capacity for the specimens made with high strength concrete compared to those made using normal strength concrete. The enhancement percentage ranges from 1.4% to 46.3%. In addition, results have shown an enhancement in the ultimate torsional capacity for specimens reinforced with spiral reinforcement compared to specimens made with conventional closed stirrups. The enhancement percentage varies from 8.3% to 34.6%. The study concluded that utilising continuous spiral reinforcement would result in higher ultimate torsional capacity than traditional closed stirrups for the same strength of concrete and that the torsion equations of ACI-318 M-19 are applicable and conservative for high strength concrete with a continuous spiral reinforcement.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2021-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81343118","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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