Some of the most widely referenced models for stress-strain relationship of confined concrete columns with square cross section are reviewed, and the performance under monotonic compressive loading is evaluated based on a database in which compressive strength ranges from 40 to 140 MPa and yield strength of transverse reinforcement ranges from 400 to 1400 MPa. It is found that the majority of the models examined can predict the strength of confined concrete reasonably well, however, the predictability to the deformation is rather low. A model for predicting deformability of confined concrete column subjected to monotonic compressive loading is proposed in terms of strain energy provided by confining reinforcement up to the peak point and the point of 85% of the maximum stress beyond the peak point. Predictions based on the strain energy are found to be in good agreement with experimental results.
{"title":"Modeling of Stress-Strain Relationship and Deformability for Confined High-Strength Concrete","authors":"H. Kinugasa, Yan Xiao, A. Martirossyan","doi":"10.14359/18267","DOIUrl":"https://doi.org/10.14359/18267","url":null,"abstract":"Some of the most widely referenced models for stress-strain relationship of confined concrete columns with square cross section are reviewed, and the performance under monotonic compressive loading is evaluated based on a database in which compressive strength ranges from 40 to 140 MPa and yield strength of transverse reinforcement ranges from 400 to 1400 MPa. It is found that the majority of the models examined can predict the strength of confined concrete reasonably well, however, the predictability to the deformation is rather low. A model for predicting deformability of confined concrete column subjected to monotonic compressive loading is proposed in terms of strain energy provided by confining reinforcement up to the peak point and the point of 85% of the maximum stress beyond the peak point. Predictions based on the strain energy are found to be in good agreement with experimental results.","PeriodicalId":104265,"journal":{"name":"SP-238: International Symposium on Confined Concrete","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116768412","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}
Over the past decade, fibre-reinforced polymer (FRP) composites have found wide applications in civil engineering, particularly in the retrofit of structures. One important application of FRP composites in the retrofit of reinforced concrete (RC) structures is to provide confinement to columns for enhanced strength and ductility. As a result, a large number of studies have been carried out on the compressive behavior of FRP-confined concrete. This paper provides a state-of-the-art review of existing studies on this subject, with the emphasis being on the revelation of the fundamental behavior of FRP-confined concrete and the modeling of this behavior. Both monotonic loading and cyclic loading are covered, although only a limited amount of work is available on the latter. The paper is explicitly limited to concrete confined with FRP jackets, in which the fibres are oriented only or predominantly in the hoop direction, but many of the observations made in this paper are also relevant to concrete confined with FRP jackets with a significant axial stiffness, as found in concrete-filled FRP tubes as new columns.
{"title":"Behavior and Modeling of FRP-Confined Concrete: A State-of-the-Art Review","authors":"J. Teng, L. Lam","doi":"10.14359/18280","DOIUrl":"https://doi.org/10.14359/18280","url":null,"abstract":"Over the past decade, fibre-reinforced polymer (FRP) composites have found wide applications in civil engineering, particularly in the retrofit of structures. One important application of FRP composites in the retrofit of reinforced concrete (RC) structures is to provide confinement to columns for enhanced strength and ductility. As a result, a large number of studies have been carried out on the compressive behavior of FRP-confined concrete. This paper provides a state-of-the-art review of existing studies on this subject, with the emphasis being on the revelation of the fundamental behavior of FRP-confined concrete and the modeling of this behavior. Both monotonic loading and cyclic loading are covered, although only a limited amount of work is available on the latter. The paper is explicitly limited to concrete confined with FRP jackets, in which the fibres are oriented only or predominantly in the hoop direction, but many of the observations made in this paper are also relevant to concrete confined with FRP jackets with a significant axial stiffness, as found in concrete-filled FRP tubes as new columns.","PeriodicalId":104265,"journal":{"name":"SP-238: International Symposium on Confined Concrete","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126104023","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}
External confinement of concrete by means of FRP composites can significantly enhance its strength and ductility as well as result in large energy absorption capacity. The present paper focuses on studying the behavior of concrete cylinders confined with hybrid FRP composites. A total of thirty 150 mm by 300 mm cylinders were tested, which included 3 plain concrete specimens, 12 concrete cylinders confined with one kind of FRP, and 20 specimens confined with hybrid FRP sheets. Experimental parameters included the different types of FRP sheets, different hybrid ratio of FRP. The relationships of axial stress-axial strain of FRP-confined concrete are studied, as well as the variation of Poisson's ratio of FRP confined concrete. Behaviors of concrete cylinders confined with hybrid FRP and counterpart specimens confined with one kind of FRP sheet are compared. Finally, some equations are proposed to evaluate the ultimate strength and strain of concrete cylinders confined with hybrid FRP. This paper provides a framework for better understanding of confining effects of concrete cylinders confined with different FRP composites.
{"title":"Experimental Study on Concrete Cylinders Confined with Various FRP under Uniaxial Compression","authors":"Gang Wu, Zhishen Wu, Zhitao Lu, Y.B. Ando","doi":"10.14359/18283","DOIUrl":"https://doi.org/10.14359/18283","url":null,"abstract":"External confinement of concrete by means of FRP composites can significantly enhance its strength and ductility as well as result in large energy absorption capacity. The present paper focuses on studying the behavior of concrete cylinders confined with hybrid FRP composites. A total of thirty 150 mm by 300 mm cylinders were tested, which included 3 plain concrete specimens, 12 concrete cylinders confined with one kind of FRP, and 20 specimens confined with hybrid FRP sheets. Experimental parameters included the different types of FRP sheets, different hybrid ratio of FRP. The relationships of axial stress-axial strain of FRP-confined concrete are studied, as well as the variation of Poisson's ratio of FRP confined concrete. Behaviors of concrete cylinders confined with hybrid FRP and counterpart specimens confined with one kind of FRP sheet are compared. Finally, some equations are proposed to evaluate the ultimate strength and strain of concrete cylinders confined with hybrid FRP. This paper provides a framework for better understanding of confining effects of concrete cylinders confined with different FRP composites.","PeriodicalId":104265,"journal":{"name":"SP-238: International Symposium on Confined Concrete","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123201916","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}
Concepts in ductile design have led to an increased interest in understanding the role of confinement in improving the seismic performance of reinforced concrete (RC) members. While transverse reinforcement is regarded as a form of passive confinement in RC members, the observed increase in the strength of confined concrete is typically a function of the axial strain levels. Confinement models have been developed by numerous researchers to describe the stress-strain behavior of concrete as a function of certain key parameters that are related to the amount and type of transverse reinforcement. Accurate constitutive models of confined concrete are necessary for direct use in fiber-model based discretization of RC components or for indirect use in hysteresis based phenomenological models. This paper examines the relevance and importance of accurate confinement modeling in predicting the inelastic behavior of well-confined concrete columns. In particular, the influence of incorporating confinement effects in predicting the monotonic and cyclic response of RC columns is investigated. It is analytically demonstrated that the role of the longitudinal reinforcing bars plays a more significant role in determining the overall force-deformation behavior of RC components. Detailed fiber-based discretizations that rely entirely on constitutive models are incapable of reproducing post-yield softening and deterioration because of their inability to incorporate complex large deformation behavior of both the longitudinal and the confining reinforcement. Approximate phenomenological models will continue to see widespread use in inelastic analysis of RC structures until these limitations of constitutive-based element models are overcome.
{"title":"Influence of Confinement Modeling on Cyclic Response of Reinforced Concrete Columns","authors":"S. Kunnath","doi":"10.14359/18265","DOIUrl":"https://doi.org/10.14359/18265","url":null,"abstract":"Concepts in ductile design have led to an increased interest in understanding the role of confinement in improving the seismic performance of reinforced concrete (RC) members. While transverse reinforcement is regarded as a form of passive confinement in RC members, the observed increase in the strength of confined concrete is typically a function of the axial strain levels. Confinement models have been developed by numerous researchers to describe the stress-strain behavior of concrete as a function of certain key parameters that are related to the amount and type of transverse reinforcement. Accurate constitutive models of confined concrete are necessary for direct use in fiber-model based discretization of RC components or for indirect use in hysteresis based phenomenological models. This paper examines the relevance and importance of accurate confinement modeling in predicting the inelastic behavior of well-confined concrete columns. In particular, the influence of incorporating confinement effects in predicting the monotonic and cyclic response of RC columns is investigated. It is analytically demonstrated that the role of the longitudinal reinforcing bars plays a more significant role in determining the overall force-deformation behavior of RC components. Detailed fiber-based discretizations that rely entirely on constitutive models are incapable of reproducing post-yield softening and deterioration because of their inability to incorporate complex large deformation behavior of both the longitudinal and the confining reinforcement. Approximate phenomenological models will continue to see widespread use in inelastic analysis of RC structures until these limitations of constitutive-based element models are overcome.","PeriodicalId":104265,"journal":{"name":"SP-238: International Symposium on Confined Concrete","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126027052","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}
A current focus in earthquake engineering research and practice is the development of seismic design procedures whose aim is to achieve a specified performance. To implement such procedures, engineers require methods to define damage in terms of engineering criteria. Previous experimental research on bridge columns has focused on component failure, with relatively little attention to other damage states. A research program was undertaken to assess the seismic performance of well-confined, circular-cross-section, reinforced concrete bridge columns at a range of damage states. The test variables included aspect ratio, longitudinal reinforcement ratio, spiral reinforcement ratio, axial load ratio, and the length of the well-confined region adjacent to the zone where plastic hinging is anticipated. The experimental results are used to identify important damage states and to link those states to engineering parameters.
{"title":"Seismic Performance of Confined Concrete Bridge Columns","authors":"J. Moehle, D. Lehman","doi":"10.14359/18262","DOIUrl":"https://doi.org/10.14359/18262","url":null,"abstract":"A current focus in earthquake engineering research and practice is the development of seismic design procedures whose aim is to achieve a specified performance. To implement such procedures, engineers require methods to define damage in terms of engineering criteria. Previous experimental research on bridge columns has focused on component failure, with relatively little attention to other damage states. A research program was undertaken to assess the seismic performance of well-confined, circular-cross-section, reinforced concrete bridge columns at a range of damage states. The test variables included aspect ratio, longitudinal reinforcement ratio, spiral reinforcement ratio, axial load ratio, and the length of the well-confined region adjacent to the zone where plastic hinging is anticipated. The experimental results are used to identify important damage states and to link those states to engineering parameters.","PeriodicalId":104265,"journal":{"name":"SP-238: International Symposium on Confined Concrete","volume":"209 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116155873","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}
Based on the success of the author's previous study, the seismic behavior of a 1/3 scale model of two-bay and three-story reinforced concrete frame with short columns being replaced by split columns at lower two stories is experimentally investigated under cyclic loads to present the seismic behavior of reinforced concrete frames by using the technology of split column. At first, a test model of two-bay and three-story reinforced concrete frame scaled to 1/3 of actual frame is designed, in which the original columns at lower two stories of the model frame are short columns and are replaced by the split columns, and is applied to constant vertical loads and cyclic horizontal loads at the top of the frame. The hysteresis curves between the cyclic horizontal load and the lateral displacement at the top of the model frame is obtained, from which it is seen that under the excitation of cyclic load, the model frame underwent the process of cracking, yielding, and maximum loading, and was destroyed under the ultimate load finally. It is also seen that the model frame with split columns represents better ductility; and the ductility factor, defined as the ratio of ultimate displacement by yielding displacement, of the model frame reaches 6.0. The yielding process of the model frame is obtained from the strain values of the longitudinal bars of beams and columns, from which it is seen that the frame with split columns can realize that the plastic hinges are generated at the ends of beams at first and then the columns begin yielding while the frame has still the load and deformation capacity. When the cyclic load reaches the maximum load, the columns begin yielding, but the deformation of frame may increase continually. It is demonstrated that splitting the sort columns can change the failure mode from shear to flexure, thus enabling a frame to have much better ductility.
{"title":"Seismic Behavior of Reinforced Concrete Frame with Split Columns","authors":"Zhongxian Li","doi":"10.14359/18288","DOIUrl":"https://doi.org/10.14359/18288","url":null,"abstract":"Based on the success of the author's previous study, the seismic behavior of a 1/3 scale model of two-bay and three-story reinforced concrete frame with short columns being replaced by split columns at lower two stories is experimentally investigated under cyclic loads to present the seismic behavior of reinforced concrete frames by using the technology of split column. At first, a test model of two-bay and three-story reinforced concrete frame scaled to 1/3 of actual frame is designed, in which the original columns at lower two stories of the model frame are short columns and are replaced by the split columns, and is applied to constant vertical loads and cyclic horizontal loads at the top of the frame. The hysteresis curves between the cyclic horizontal load and the lateral displacement at the top of the model frame is obtained, from which it is seen that under the excitation of cyclic load, the model frame underwent the process of cracking, yielding, and maximum loading, and was destroyed under the ultimate load finally. It is also seen that the model frame with split columns represents better ductility; and the ductility factor, defined as the ratio of ultimate displacement by yielding displacement, of the model frame reaches 6.0. The yielding process of the model frame is obtained from the strain values of the longitudinal bars of beams and columns, from which it is seen that the frame with split columns can realize that the plastic hinges are generated at the ends of beams at first and then the columns begin yielding while the frame has still the load and deformation capacity. When the cyclic load reaches the maximum load, the columns begin yielding, but the deformation of frame may increase continually. It is demonstrated that splitting the sort columns can change the failure mode from shear to flexure, thus enabling a frame to have much better ductility.","PeriodicalId":104265,"journal":{"name":"SP-238: International Symposium on Confined Concrete","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127012095","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}
The objective of this research project is to conduct an experimental study of the behavior of carbon fiber-reinforced polymer (CFRP) materials for strengthening reinforced concrete structures. The test program consisted of 23 reinforced concrete columns strengthened with CFRP sheets under static eccentric compressive loading. It is shown that under large eccentric compression loading, ultimate capacity of the columns can be effectively increased with the longitudinal CFRP sheets, and the ductility factors of the columns can be increased with the transverse CFRP sheets. It was observed that the material strength utilization of transverse CFRP sheets was more sufficient than that of longitudinal CFRP.
{"title":"Experimental Study of RC Columns Strengthened with CFRP Sheets Under Eccentric Compression","authors":"W. Yi, Q. Xian, Hong Ding, Haiyan Zhang","doi":"10.14359/18284","DOIUrl":"https://doi.org/10.14359/18284","url":null,"abstract":"The objective of this research project is to conduct an experimental study of the behavior of carbon fiber-reinforced polymer (CFRP) materials for strengthening reinforced concrete structures. The test program consisted of 23 reinforced concrete columns strengthened with CFRP sheets under static eccentric compressive loading. It is shown that under large eccentric compression loading, ultimate capacity of the columns can be effectively increased with the longitudinal CFRP sheets, and the ductility factors of the columns can be increased with the transverse CFRP sheets. It was observed that the material strength utilization of transverse CFRP sheets was more sufficient than that of longitudinal CFRP.","PeriodicalId":104265,"journal":{"name":"SP-238: International Symposium on Confined Concrete","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131820721","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}
This paper presents an analytical procedure for determining the stress-strain curves of concrete under flexure. The procedure is used to derive the stress-strain curves of confined concrete from tests of thirteen high strength concrete (HSC) columns confined by transverse reinforcement and subjected to different strain gradients. The effects of strain gradient to the stress-strain curves of confined concrete is observed and an analytical model for confined concrete that accounts for this effect is proposed.
{"title":"Flexural Stress-Strain Curves of Confined High-Strength Concrete (ISCC-2004)","authors":"T. Tan, N. Nguyen","doi":"10.14359/18268","DOIUrl":"https://doi.org/10.14359/18268","url":null,"abstract":"This paper presents an analytical procedure for determining the stress-strain curves of concrete under flexure. The procedure is used to derive the stress-strain curves of confined concrete from tests of thirteen high strength concrete (HSC) columns confined by transverse reinforcement and subjected to different strain gradients. The effects of strain gradient to the stress-strain curves of confined concrete is observed and an analytical model for confined concrete that accounts for this effect is proposed.","PeriodicalId":104265,"journal":{"name":"SP-238: International Symposium on Confined Concrete","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125270216","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}
A series of experiments were conducted on the performance of concrete under varying levels of passive confinement. Glass and carbon fiber reinforced polymers, and steel plate were used to provide confinement. The research presented compares the measured performance of the jacketed systems with current predictor models and finite element estimations. Two categories of predictor models are examined: Constant Confinement (CC) and Variable Confinement (VC). The CC model assumes that the confining pressure provided by the jacket is active and constant over the load history. VC model assumes that the confinement passively increases as lateral dilation occurs. The research shows that VC models provide improved accuracy over CC models in predicting the stress strain response of confined concrete. Use of multi-linear relationships between axial and transverse strain combined with stress-strain relationships previously developed provide a comprehensive method of estimation. The limitations of these methods are clearly illustrated through examples.
{"title":"Accuracy and Improvements for Variable and Constant Confinement Concrete Models","authors":"Clay J. Naito, Fatih Cetisli","doi":"10.14359/18270","DOIUrl":"https://doi.org/10.14359/18270","url":null,"abstract":"A series of experiments were conducted on the performance of concrete under varying levels of passive confinement. Glass and carbon fiber reinforced polymers, and steel plate were used to provide confinement. The research presented compares the measured performance of the jacketed systems with current predictor models and finite element estimations. Two categories of predictor models are examined: Constant Confinement (CC) and Variable Confinement (VC). The CC model assumes that the confining pressure provided by the jacket is active and constant over the load history. VC model assumes that the confinement passively increases as lateral dilation occurs. The research shows that VC models provide improved accuracy over CC models in predicting the stress strain response of confined concrete. Use of multi-linear relationships between axial and transverse strain combined with stress-strain relationships previously developed provide a comprehensive method of estimation. The limitations of these methods are clearly illustrated through examples.","PeriodicalId":104265,"journal":{"name":"SP-238: International Symposium on Confined Concrete","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129520779","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}
Shouping Shang, L. Jiang, Moaxin Zhang, Linghong Zeng
Eleven approximate full-size specimens including nine eccentrically compressed columns of monotonic loading and two axially compressed columns of laterally cyclic loading were tested. By a series of comparison experiments of specimens strengthened using a kind of composite mortar laminates reinforced by mesh reinforcements (CMMR laminates) and no strengthened specimens, it was found that the RC columns strengthened with attached CMMR laminates demonstrated greater degree of improving in load-bearing capacity, in which the carrying capacity increment of the strengthened eccentrically compressed columns with lesser eccentricity was greater than that of the same type of columns with bigger eccentricity under the same strengthening conditions; the strengthening effects of the specimens with lower concrete grade are better than that of those ones with higher concrete grade; the ductility and the deformation capacity and energy dissipation ability of the strengthened columns were remarkable increased. In this paper the test results are described, and the principle and regularity that this category of strengthening laminate improved the ultimate load-bearing capacity, ductility, cracking behavior and mode of failure, etc. of the RC columns are analyzed. The studying results proved that this strengthening measure for RC columns is superior to make the strengthening effect notable, working behavior of strengthened column excellent, strengthening construction easy and economical.
{"title":"Experimental Investigation into Strengthening of RC Columns using Composite Mortar Laminates Reinforced with Mesh Reinforcements","authors":"Shouping Shang, L. Jiang, Moaxin Zhang, Linghong Zeng","doi":"10.14359/18287","DOIUrl":"https://doi.org/10.14359/18287","url":null,"abstract":"Eleven approximate full-size specimens including nine eccentrically compressed columns of monotonic loading and two axially compressed columns of laterally cyclic loading were tested. By a series of comparison experiments of specimens strengthened using a kind of composite mortar laminates reinforced by mesh reinforcements (CMMR laminates) and no strengthened specimens, it was found that the RC columns strengthened with attached CMMR laminates demonstrated greater degree of improving in load-bearing capacity, in which the carrying capacity increment of the strengthened eccentrically compressed columns with lesser eccentricity was greater than that of the same type of columns with bigger eccentricity under the same strengthening conditions; the strengthening effects of the specimens with lower concrete grade are better than that of those ones with higher concrete grade; the ductility and the deformation capacity and energy dissipation ability of the strengthened columns were remarkable increased. In this paper the test results are described, and the principle and regularity that this category of strengthening laminate improved the ultimate load-bearing capacity, ductility, cracking behavior and mode of failure, etc. of the RC columns are analyzed. The studying results proved that this strengthening measure for RC columns is superior to make the strengthening effect notable, working behavior of strengthened column excellent, strengthening construction easy and economical.","PeriodicalId":104265,"journal":{"name":"SP-238: International Symposium on Confined Concrete","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124871257","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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