Pub Date : 2018-03-29DOI: 10.1504/IJSTRUCTE.2018.10011862
B. Balasubramanian, R. Baskar
The paper presents the results of an investigation on steel-concrete composite beam subjected to static loading. An experimental investigation and analytical study using finite element analysis (FEA). The load carrying capacity of the steel-concrete composite beam is presented. The steel-concrete composite beam is embedded with 19 mm stud shear connector. The interaction of steel-concrete layers of composite beam with headed stud shear connector due to the application of flexural load is analysed. The experimental results are compared with those of analytical modelling using ANSYS 10.
{"title":"Performance study of steel-concrete composite beam involving flexible shear connector","authors":"B. Balasubramanian, R. Baskar","doi":"10.1504/IJSTRUCTE.2018.10011862","DOIUrl":"https://doi.org/10.1504/IJSTRUCTE.2018.10011862","url":null,"abstract":"The paper presents the results of an investigation on steel-concrete composite beam subjected to static loading. An experimental investigation and analytical study using finite element analysis (FEA). The load carrying capacity of the steel-concrete composite beam is presented. The steel-concrete composite beam is embedded with 19 mm stud shear connector. The interaction of steel-concrete layers of composite beam with headed stud shear connector due to the application of flexural load is analysed. The experimental results are compared with those of analytical modelling using ANSYS 10.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":"9 1","pages":"70"},"PeriodicalIF":1.3,"publicationDate":"2018-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48848431","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 : 2018-03-29DOI: 10.1504/IJSTRUCTE.2018.10011858
J. Rishmany, I. Tawk, A. Gergess
Cold bending is a cost-effective solution that is sometimes used for curving structural steel girders. Current usage for bridge structures is limited to projects that fall outside the jurisdiction of American Association of State Highway and Transportation Officials (AASHTO) because of the lack of technical knowledge surrounding this technique. This paper presents results from a three-dimensional finite element model to assess the structural behaviour exhibited by steel girders during bending for a proprietary cold curving system. A non-linear FE model is validated against measured data obtained from a previously tested girder. The FE model is extended to explore the performance of all structural components of the girder during bending such as deformations in flanges and web, residual stresses and plastic strains. Findings from this paper provide a framework for accurately predicting the cold bent geometry and how to incorporate residual stresses and plastic strains in the design of curved girders.
{"title":"Finite element modelling of a cold curved steel plate girder","authors":"J. Rishmany, I. Tawk, A. Gergess","doi":"10.1504/IJSTRUCTE.2018.10011858","DOIUrl":"https://doi.org/10.1504/IJSTRUCTE.2018.10011858","url":null,"abstract":"Cold bending is a cost-effective solution that is sometimes used for curving structural steel girders. Current usage for bridge structures is limited to projects that fall outside the jurisdiction of American Association of State Highway and Transportation Officials (AASHTO) because of the lack of technical knowledge surrounding this technique. This paper presents results from a three-dimensional finite element model to assess the structural behaviour exhibited by steel girders during bending for a proprietary cold curving system. A non-linear FE model is validated against measured data obtained from a previously tested girder. The FE model is extended to explore the performance of all structural components of the girder during bending such as deformations in flanges and web, residual stresses and plastic strains. Findings from this paper provide a framework for accurately predicting the cold bent geometry and how to incorporate residual stresses and plastic strains in the design of curved girders.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":"9 1","pages":"1"},"PeriodicalIF":1.3,"publicationDate":"2018-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44685252","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 : 2018-03-29DOI: 10.1504/IJSTRUCTE.2018.10009092
R. Sheth, Jayeshkumar C. Prajapati, D. Soni
A major challenge in performance-based earthquake engineering is to develop simple and practical methods for estimating the capacity level and seismic demand on structures by taking into account their inelastic behaviour instead of complicated nonlinear time history analysis. However, in nonlinear static procedure, both predetermined target displacement and force distribution pattern are based on a false assumption that the structural behaviour and its responses are dominated by the fundamental vibration modes. Displacement-based adaptive pushover analysis (DAP) is one of the performance assessment tools for improving the accuracy of the obtained results of the nonlinear static analysis in estimating the seismic demands of structures. The paper attempts to use DAP method to evaluate the performance of 6, 9, 12 and 15 storey RC moment resisting frame, analysed for seismic Zone V and designed as per provisions of IS codes. It is observed from the study that DAP analysis shows better results compared to static pushover analysis.
{"title":"Comparative study nonlinear static pushover analysis and displacement based adaptive pushover analysis method","authors":"R. Sheth, Jayeshkumar C. Prajapati, D. Soni","doi":"10.1504/IJSTRUCTE.2018.10009092","DOIUrl":"https://doi.org/10.1504/IJSTRUCTE.2018.10009092","url":null,"abstract":"A major challenge in performance-based earthquake engineering is to develop simple and practical methods for estimating the capacity level and seismic demand on structures by taking into account their inelastic behaviour instead of complicated nonlinear time history analysis. However, in nonlinear static procedure, both predetermined target displacement and force distribution pattern are based on a false assumption that the structural behaviour and its responses are dominated by the fundamental vibration modes. Displacement-based adaptive pushover analysis (DAP) is one of the performance assessment tools for improving the accuracy of the obtained results of the nonlinear static analysis in estimating the seismic demands of structures. The paper attempts to use DAP method to evaluate the performance of 6, 9, 12 and 15 storey RC moment resisting frame, analysed for seismic Zone V and designed as per provisions of IS codes. It is observed from the study that DAP analysis shows better results compared to static pushover analysis.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":"9 1","pages":"81"},"PeriodicalIF":1.3,"publicationDate":"2018-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43049526","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 : 2017-09-13DOI: 10.1504/IJSTRUCTE.2017.10007467
Umesh Kumar Pandey, G. Benipal
Of late, the attention of the dynamicists has increasingly been focused on the multi-degree of freedom (MDOF) nonlinear dynamical systems. In the present paper, a new class of conservative two-DOF nonlinear dynamical systems - first order homogeneous dynamical (FOHD) systems - has been proposed. This investigation is motivated by two-DOF cracked concrete beams undergoing small deformations. For these mechanical systems, the nodal forces are functions homogeneous of order one of the nodal displacements and vice-versa. Under assumptions of lumped nodal masses and classical damping, the equations of motion have been derived in the paper. The nodal displacement space has been partitioned into four elastically-distinct regions. Within the two nonlinear elastic regions, the stiffness and damping coefficients as well as the modal frequencies have been shown to vary continuously but remain constant within the two linear regions. Peculiar characteristics distinguishing the FOHD systems from other known MDOF nonlinear dynamical systems have been identified. Theoretical significance of the proposed FOHD systems in the general nonlinear dynamical systems theory has been brought out. The issues such as empirical validation of the predicted dynamical response and the practical relevance of the work done for the concrete beams under working loads have also been discussed.
{"title":"First order homogeneous dynamical systems 1: theoretical formulation","authors":"Umesh Kumar Pandey, G. Benipal","doi":"10.1504/IJSTRUCTE.2017.10007467","DOIUrl":"https://doi.org/10.1504/IJSTRUCTE.2017.10007467","url":null,"abstract":"Of late, the attention of the dynamicists has increasingly been focused on the multi-degree of freedom (MDOF) nonlinear dynamical systems. In the present paper, a new class of conservative two-DOF nonlinear dynamical systems - first order homogeneous dynamical (FOHD) systems - has been proposed. This investigation is motivated by two-DOF cracked concrete beams undergoing small deformations. For these mechanical systems, the nodal forces are functions homogeneous of order one of the nodal displacements and vice-versa. Under assumptions of lumped nodal masses and classical damping, the equations of motion have been derived in the paper. The nodal displacement space has been partitioned into four elastically-distinct regions. Within the two nonlinear elastic regions, the stiffness and damping coefficients as well as the modal frequencies have been shown to vary continuously but remain constant within the two linear regions. Peculiar characteristics distinguishing the FOHD systems from other known MDOF nonlinear dynamical systems have been identified. Theoretical significance of the proposed FOHD systems in the general nonlinear dynamical systems theory has been brought out. The issues such as empirical validation of the predicted dynamical response and the practical relevance of the work done for the concrete beams under working loads have also been discussed.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":"8 1","pages":"187"},"PeriodicalIF":1.3,"publicationDate":"2017-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49264144","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 : 2017-09-13DOI: 10.1504/IJSTRUCTE.2017.10007508
Cheng Yu, H. Vora
Flat steel sheet is the common steel sheathing for cold-formed steel (CFS) framed shear walls. Compared to wood sheathing, the practical sheet steel sheathing gives lower shear strength and it tends to fail in the shear buckling which results in large out of plane deformation. On the other hand, sheet steel sheathing is non-combustible material which has great applications in mid-rise residential or commercial buildings. In order to develop a high strength CFS shear wall assemblies with steel sheathing, a pilot research was conducted at University of North Texas to experimentally investigate the behaviour and shear strength of CFS framed wall assemblies with 0.027 in. (22 gauge) corrugated sheet steel sheathing. The parameters considered in the test program included the framing member thickness, the fastener size and spacing, and the boundary stud configurations. Both monotonic and cyclic tests were conducted. The test results indicated that with appropriate framing members and the fastener configurations, the corrugated steel sheet can provide much higher shear strength than the flat steel sheet having the same thickness. This paper presents the test details, test results, and the analysis on the ductility of the shear wall system under monotonic and cyclic loading.
{"title":"A pilot study on cold-formed steel framed shear wall assemblies with corrugated sheathing","authors":"Cheng Yu, H. Vora","doi":"10.1504/IJSTRUCTE.2017.10007508","DOIUrl":"https://doi.org/10.1504/IJSTRUCTE.2017.10007508","url":null,"abstract":"Flat steel sheet is the common steel sheathing for cold-formed steel (CFS) framed shear walls. Compared to wood sheathing, the practical sheet steel sheathing gives lower shear strength and it tends to fail in the shear buckling which results in large out of plane deformation. On the other hand, sheet steel sheathing is non-combustible material which has great applications in mid-rise residential or commercial buildings. In order to develop a high strength CFS shear wall assemblies with steel sheathing, a pilot research was conducted at University of North Texas to experimentally investigate the behaviour and shear strength of CFS framed wall assemblies with 0.027 in. (22 gauge) corrugated sheet steel sheathing. The parameters considered in the test program included the framing member thickness, the fastener size and spacing, and the boundary stud configurations. Both monotonic and cyclic tests were conducted. The test results indicated that with appropriate framing members and the fastener configurations, the corrugated steel sheet can provide much higher shear strength than the flat steel sheet having the same thickness. This paper presents the test details, test results, and the analysis on the ductility of the shear wall system under monotonic and cyclic loading.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":"8 1","pages":"272"},"PeriodicalIF":1.3,"publicationDate":"2017-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46707508","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 : 2017-09-13DOI: 10.1504/IJSTRUCTE.2017.10007459
N. Mehta, Snehal V. Mevada
This article presents a comparative study of the linearly elastic, single-storey, two-way asymmetric system under bi-directional earthquake excitation. The comparative study includes the following dampers: linear and nonlinear fluid viscous dampers, semi-active friction damper and hybrid arrangement of fluid viscous dampers and semi-active friction damper. The response is obtained by numerically solving the governing equations of motion using state space method. The effect of power law coefficient, supplemental damping ratio, stiffness coefficient and gain multiplier on peak response which includes lateral, torsional displacement and acceleration are investigated. To study the effectiveness of dampers, the controlled response of asymmetric system is compared with the corresponding uncontrolled response. The parametric study indicated that the hybrid arrangement of damper is quite effective in reducing various responses. It is further observed that fluid viscous dampers are effective in reducing displacement response and semi-active friction dampers are effective in reducing acceleration response.
{"title":"Seismic response of two-way asymmetric building installed with hybrid arrangement of dampers under bi-directional excitations","authors":"N. Mehta, Snehal V. Mevada","doi":"10.1504/IJSTRUCTE.2017.10007459","DOIUrl":"https://doi.org/10.1504/IJSTRUCTE.2017.10007459","url":null,"abstract":"This article presents a comparative study of the linearly elastic, single-storey, two-way asymmetric system under bi-directional earthquake excitation. The comparative study includes the following dampers: linear and nonlinear fluid viscous dampers, semi-active friction damper and hybrid arrangement of fluid viscous dampers and semi-active friction damper. The response is obtained by numerically solving the governing equations of motion using state space method. The effect of power law coefficient, supplemental damping ratio, stiffness coefficient and gain multiplier on peak response which includes lateral, torsional displacement and acceleration are investigated. To study the effectiveness of dampers, the controlled response of asymmetric system is compared with the corresponding uncontrolled response. The parametric study indicated that the hybrid arrangement of damper is quite effective in reducing various responses. It is further observed that fluid viscous dampers are effective in reducing displacement response and semi-active friction dampers are effective in reducing acceleration response.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":"8 1","pages":"249"},"PeriodicalIF":1.3,"publicationDate":"2017-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45485205","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 : 2017-09-13DOI: 10.1504/IJSTRUCTE.2017.086458
Asier Calvo Álvarez, V. Arora
Though traditional deterministic finite element model updating (FEMU) methods are being used in the industry with good results, however, these methods do not include the small variations in uncertainties. These uncertainties arise due to unknown experimental errors or variability in nominally identical dynamic systems. It is necessary to resort to the stochastic finite element model updating (SFEMU) methods to deal with these problems. Although any modal parameter can be used to update a dynamic system, this paper explores the possibility of updating a dynamic system using only natural frequencies, because natural frequencies can be obtained more accurately with lesser computational cost than obtaining any other modal parameters. In this paper, stochastic finite element model updating procedure has been proposed which uses natural frequencies with equal weighting factors to perform the stochastic finite element model updating. The effectiveness of the proposed stochastic finite element model updating procedure is demonstrated by two numerical examples and one experimental example. The results show that the stochastic finite element model updating procedure using only natural frequencies with equal weighting factors can be used for accurate quantification of uncertainties in the dynamic systems.
{"title":"Natural frequencies-based stochastic finite element model updating using equal weighting factors","authors":"Asier Calvo Álvarez, V. Arora","doi":"10.1504/IJSTRUCTE.2017.086458","DOIUrl":"https://doi.org/10.1504/IJSTRUCTE.2017.086458","url":null,"abstract":"Though traditional deterministic finite element model updating (FEMU) methods are being used in the industry with good results, however, these methods do not include the small variations in uncertainties. These uncertainties arise due to unknown experimental errors or variability in nominally identical dynamic systems. It is necessary to resort to the stochastic finite element model updating (SFEMU) methods to deal with these problems. Although any modal parameter can be used to update a dynamic system, this paper explores the possibility of updating a dynamic system using only natural frequencies, because natural frequencies can be obtained more accurately with lesser computational cost than obtaining any other modal parameters. In this paper, stochastic finite element model updating procedure has been proposed which uses natural frequencies with equal weighting factors to perform the stochastic finite element model updating. The effectiveness of the proposed stochastic finite element model updating procedure is demonstrated by two numerical examples and one experimental example. The results show that the stochastic finite element model updating procedure using only natural frequencies with equal weighting factors can be used for accurate quantification of uncertainties in the dynamic systems.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":"8 1","pages":"227-288"},"PeriodicalIF":1.3,"publicationDate":"2017-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/IJSTRUCTE.2017.086458","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42551360","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 : 2017-09-13DOI: 10.1504/IJSTRUCTE.2017.10007468
Umesh Kumar Pandey, G. Benipal
In this two-part paper, a new class - first order homogeneous dynamical (FOHD) systems - of two-DOF conservative nonlinear dynamical systems has been explored. Theoretical formulation and significance of proposed theory have been presented in part-I. Using the proposed theory, the dynamical behaviour of the two-DOF cracked concrete beam has been predicted here. A new type of phase plot for MDOF dynamical systems has been proposed. Depending upon the loading details and system parameters, the vibration response of these essentially nonlinear systems can be linear, bilinear or nonlinear. Forced vibrations about the passive state have been predicted to resemble linear vibrations in some respects. Like other nonlinear dynamical systems, concrete beam response has also been found to be quite sensitive to initial conditions and system parameters, and to exhibit sub-harmonics and combination sub-harmonics. Feasibility of a nonlinear tuned mass vibration absorber has also been explored. Empirical validation and practical relevance of the proposed theory have been discussed.
{"title":"First order homogeneous dynamical systems 2: application to cracked concrete beams","authors":"Umesh Kumar Pandey, G. Benipal","doi":"10.1504/IJSTRUCTE.2017.10007468","DOIUrl":"https://doi.org/10.1504/IJSTRUCTE.2017.10007468","url":null,"abstract":"In this two-part paper, a new class - first order homogeneous dynamical (FOHD) systems - of two-DOF conservative nonlinear dynamical systems has been explored. Theoretical formulation and significance of proposed theory have been presented in part-I. Using the proposed theory, the dynamical behaviour of the two-DOF cracked concrete beam has been predicted here. A new type of phase plot for MDOF dynamical systems has been proposed. Depending upon the loading details and system parameters, the vibration response of these essentially nonlinear systems can be linear, bilinear or nonlinear. Forced vibrations about the passive state have been predicted to resemble linear vibrations in some respects. Like other nonlinear dynamical systems, concrete beam response has also been found to be quite sensitive to initial conditions and system parameters, and to exhibit sub-harmonics and combination sub-harmonics. Feasibility of a nonlinear tuned mass vibration absorber has also been explored. Empirical validation and practical relevance of the proposed theory have been discussed.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":"8 1","pages":"205"},"PeriodicalIF":1.3,"publicationDate":"2017-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41792755","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 : 2017-06-21DOI: 10.1504/IJSTRUCTE.2017.10005470
H. Katkhuda, Nasim Shatarat, K. Hyari
A two-stage finite element system identification (SI) technique is proposed in this paper to identify stiffness of elements and detect damages in three-dimensional framed structures. The technique combines in stage 1 the iterative least-square and in stage 2 the unscented Kalman filter (UKF) to identify the stiffness of elements using only limited measured response time histories from only four to six accelerometers instead of dozens of accelerometers of the whole structure and assuming the time history of dynamic load applied on structure is unknown. The method will identify the stiffness and detect the damages in the elements by tracking the changes in the recordable dynamic output responses between damaged and undamaged states. The optimum number and locations of accelerometers were studied in this paper. The algorithm is verified using numerical examples. The results showed clearly that the technique can identify damaged and undamaged three-dimensional steel framed structures and the minimum number of sensors required for such frames.
{"title":"Two-stage system identification approach for three-dimensional structural systems","authors":"H. Katkhuda, Nasim Shatarat, K. Hyari","doi":"10.1504/IJSTRUCTE.2017.10005470","DOIUrl":"https://doi.org/10.1504/IJSTRUCTE.2017.10005470","url":null,"abstract":"A two-stage finite element system identification (SI) technique is proposed in this paper to identify stiffness of elements and detect damages in three-dimensional framed structures. The technique combines in stage 1 the iterative least-square and in stage 2 the unscented Kalman filter (UKF) to identify the stiffness of elements using only limited measured response time histories from only four to six accelerometers instead of dozens of accelerometers of the whole structure and assuming the time history of dynamic load applied on structure is unknown. The method will identify the stiffness and detect the damages in the elements by tracking the changes in the recordable dynamic output responses between damaged and undamaged states. The optimum number and locations of accelerometers were studied in this paper. The algorithm is verified using numerical examples. The results showed clearly that the technique can identify damaged and undamaged three-dimensional steel framed structures and the minimum number of sensors required for such frames.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":"8 1","pages":"93"},"PeriodicalIF":1.3,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43417335","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 : 2017-06-21DOI: 10.1504/IJSTRUCTE.2017.10005472
A. D. Tsonos, G. Kalogeropoulos, Pantelis E. Iakovidis, D. Konstantinidis
The efficiency of an innovative seismic retrofit scheme, proposed for the improvement of the overall lateral performance of poorly detailed existing reinforced concrete structures, is herein experimentally investigated. One original cantilever column sub-assemblage with continuous longitudinal reinforcement, representative of the best construction practice regarding columns found in bridges designed for gravity load only in the 1950s-1970s period, was subjected to cyclic lateral loading to failure. The column was subsequently retrofitted with a high performance steel fibre concrete jacket. No conventional reinforcement was used for the construction of the jacket. The fibre volume fraction was equal to 1.50%. The post-earthquake enhanced specimen was subjected to a large number of inelastic cyclic deformations. Test results clearly demonstrated the reliability of the proposed retrofit scheme, which successfully prevented the brittle shear failure of the enhanced column and ensured a desirable ductile behaviour under reversed lateral deformations of the earthquake-type loading.
{"title":"Seismic retrofitting of pre-1970 RC bridge columns using innovative jackets","authors":"A. D. Tsonos, G. Kalogeropoulos, Pantelis E. Iakovidis, D. Konstantinidis","doi":"10.1504/IJSTRUCTE.2017.10005472","DOIUrl":"https://doi.org/10.1504/IJSTRUCTE.2017.10005472","url":null,"abstract":"The efficiency of an innovative seismic retrofit scheme, proposed for the improvement of the overall lateral performance of poorly detailed existing reinforced concrete structures, is herein experimentally investigated. One original cantilever column sub-assemblage with continuous longitudinal reinforcement, representative of the best construction practice regarding columns found in bridges designed for gravity load only in the 1950s-1970s period, was subjected to cyclic lateral loading to failure. The column was subsequently retrofitted with a high performance steel fibre concrete jacket. No conventional reinforcement was used for the construction of the jacket. The fibre volume fraction was equal to 1.50%. The post-earthquake enhanced specimen was subjected to a large number of inelastic cyclic deformations. Test results clearly demonstrated the reliability of the proposed retrofit scheme, which successfully prevented the brittle shear failure of the enhanced column and ensured a desirable ductile behaviour under reversed lateral deformations of the earthquake-type loading.","PeriodicalId":38785,"journal":{"name":"International Journal of Structural Engineering","volume":"8 1","pages":"133"},"PeriodicalIF":1.3,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45164366","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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