约束钢管混凝土圆柱的低周反复荷载试验研究
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摘要
文章进行了2根圆钢管混凝土柱和4根碳纤维约束圆钢管混凝土柱的低周往复荷载试验。研究了两者破坏形态、滞回性能与变形耗能等方面的差异。试验结果表明,碳纤维的横向附加约束改变了钢管混凝土柱的破坏形态,使其具有更好的延性与耗能能力。以试件的循环耗能为基础,建立了基于疲劳耗能的累积损伤模型用于模拟结构的损伤程度。分析了试件耗能与损伤指标的相关性,以及不同加载制度对试件损伤的影响。分析表明,试验加载制度的差异,对构件循环次数与损伤值的关系有所影响,循环幅值越大,单次损伤指标值越高,但是参数相同的试件在破坏状态下的耗能与最终损伤总指标基本一致。试件耗能与损伤指标的相关性较好,表明该模型可以模拟试件的损伤情况,能够用于地震作用后的累积损伤评估。
Reversed cyclic loading under constant axial load experiment was conducted on 2 conventional concrete filled steel tubular(CFT) columns and 4 carbon-fiber-reinforced polymer(CFRP) confined concrete filled steel tubular(CFT) columns.Failure mode,hysteretic behavior and energy dissipation were investigated.The experimental results show the horizontal restraining by carbon-fiber changes the failure mode of the CFT.Based on the cyclic energy consumption of the specimens,a cumulative damage model based on fatigue energy consumption was established to simulate the damage extent of the column.The relationship between energy dissipation and damage index was analyzed,and we found that the different loading sequence has influence on the specimen damage.The damage index was increased with the cyclic amplitude,however the total energy consumption and the final damage index achieve the same level when the parameters are the same.The energy consumption of the specimens has good correlation with the damage index.This indicates the proposed model could be used for accumulative damage evaluation.
Reversed cyclic loading under constant axial load experiment was conducted on 2 conventional concrete filled steel tubular(CFT) columns and 4 carbon-fiber-reinforced polymer(CFRP) confined concrete filled steel tubular(CFT) columns.Failure mode,hysteretic behavior and energy dissipation were investigated.The experimental results show the horizontal restraining by carbon-fiber changes the failure mode of the CFT.Based on the cyclic energy consumption of the specimens,a cumulative damage model based on fatigue energy consumption was established to simulate the damage extent of the column.The relationship between energy dissipation and damage index was analyzed,and we found that the different loading sequence has influence on the specimen damage.The damage index was increased with the cyclic amplitude,however the total energy consumption and the final damage index achieve the same level when the parameters are the same.The energy consumption of the specimens has good correlation with the damage index.This indicates the proposed model could be used for accumulative damage evaluation.
引文
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[11]王庆利,薛阳,邵永波,等.CFRP约束方钢管混凝土轴压短柱的静力性能研究[J].土木工程学报,2011,44(3):24-31.WANG Qingli,XUE Yang,SHAO Yongbo,et al.Study of static performance of axially compressed concrete filled square steel tubular stub columns confined by CFRP[J].China Civil Engineering Journal,2011,44(3):24-31.(in Chinese)
[12]张国伟.钢管混凝土柱在地震作用下的累积损伤性能研究[D].长沙:湖南大学,2009.ZHANG Guowei.Research on cumulitive seismic damage of CFT columns[D].Changsha:Hunan University,2009.(in Chinese)
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[2]肖岩.套管钢筋混凝土柱结构的发展和展望[J].土木工程学报,2004,37(4):8-12.XIAO Yan.Development and prospects of tubed reinforced concrete column structures[J].China Civil Engineering Journal,2004,37(4):8-12.(in Chinese)
[3]Varma A H,Ricles J M,Sause R,et al.Seismic behavior and modeling of high-strength composite concrete-filled tube(CFT)Beam-columns[J].Journal of Constructional Steel Research,2002,58(5/8):725-758.
[4]Varma A H,Ricles J M,Sause R,et al.Experiment behavior of high strength square concrete-Filled steel tube beam-columns[J].Journal of Structural Engineering,2002,128:309-318.
[5]Xiao Y,He W H,Mao X Y,et al.Confinement design of CFT columns for improved seismic performance.[C]//Proceedings of the International Workshop on Steel and Concrete Composite Construction(IWSCCC-2003),Taipei,2003:217-226.
[6]Xiao Y,He W H,Choi K G.Confined concrete filled tubular(CCFT)columns[J].ASCE Journal of Structural Engineering,2005,131(3):488-497.
[7]Choi K G,Xiao Y.Analytical model of circular CFRP confined concrete-Filled steel tubular columns under axial compression[J].ASCE Journal of Compsites for Construction,2010,14(1):125-133.
[8]肖岩,何文辉,毛小勇.约束钢管混凝土柱的开发研究[J].建筑结构学报,2004,25(6):59-66.XIAO Yan,HE Wenhui,MAO Xiaoyong.Development of confined concrete filled tubular(CCFT)columns[J].Journal of Building Structures,2004,25(6):67-74.(in Chinese)
[9]王庆利,车媛,叶茂.CFRP增强方截面钢管混凝土受弯性能研究[J].土木工程学报,2011,44(增刊):17-23.WANG Qingli,CHE Yuan,YE Mao.Research on flexural performances on the CFRP confined concrete filled steel tube with square cross-section[J].China Civil Engineering Journal,2011,44(S):17-23.(in Chinese)
[10]车媛,王庆利,邵永波,等.圆CFRP-钢管混凝土压弯构件滞回性能试验研究[J].土木工程学报,2011,44(7):46-54.CHE Yuan,WANG Qingli,SHAO Yongbo,et al.Experimental study on hysteretic behaviors of concrete filled circular CFRP-steel tubular beamcolumns[J].China Civil Engineering Journal,2011,44(7):46-54.(in Chinese)
[11]王庆利,薛阳,邵永波,等.CFRP约束方钢管混凝土轴压短柱的静力性能研究[J].土木工程学报,2011,44(3):24-31.WANG Qingli,XUE Yang,SHAO Yongbo,et al.Study of static performance of axially compressed concrete filled square steel tubular stub columns confined by CFRP[J].China Civil Engineering Journal,2011,44(3):24-31.(in Chinese)
[12]张国伟.钢管混凝土柱在地震作用下的累积损伤性能研究[D].长沙:湖南大学,2009.ZHANG Guowei.Research on cumulitive seismic damage of CFT columns[D].Changsha:Hunan University,2009.(in Chinese)
[13]Manson S S.Behavior of materials under conditions of thermal stress[J].Heat Transfer Symposium,University of Michigan Engineering Research Institute,1953:9-75.
[14]Coffin L F.A study of effects of cyclic thermal stresses on ductile metal[J].Transactions of the American Society of Mechanical Engineers,1954,75:931-950.
[15]Miner M A.Cumulative damage in fatigue[J].J.Appl.Mech.,1945,12(3):159-164.
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