地震荷载作用下FRP加固钢筋混凝土圆柱变形能力计算方法研究  

DEFORMATION CAPACITY OF FRP RETROFITTED CIRCULAR CONCRETE COLUMNS UNDER SIMULATED SEISMIC LOADING

作　　者：顾冬生[1,2] 吴刚[2] 

机构地区：[1]江南大学环境与土木工程学院,江苏无锡214122 [2]东南大学城市工程科学国际研究中心,江苏南京210096

出　　处：《工程力学》2013年第1期261-270,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(50908102;51078077);中央高校基本科研业务费专项资金项目(JUSRP 21114);无锡市建设系统科技项目(WX2012010)

摘　　要：基于性能的抗震设计要求对结构的变形能力能够进行计算,以确保不同的性能目标要求得以满足。该文研究地震荷载作用下纤维增强复合材料(FRP)加固钢筋混凝土(RC)圆柱截面曲率延性和柱顶侧向位移角计算方法。根据数值计算结果,得到了截面屈服曲率计算方法,由试验结果得到了FRP加固RC圆柱截面极限曲率计算方法。试验结果表明加固柱塑性铰长度和FRP用量密切相关,通过对29个大比例柱试验结果进行回归,得到了加固柱塑性铰长度计算方法,并分析了高FRP用量导致加固柱塑性铰长度减小的原因。经参数分析,探讨了FRP用量、轴压比与加固柱顶侧向变形能力的关系,提出了具有理想加固效率的FRP用量上限范围。Performance based design necessitates the accurate calculation of deformation capacity of structures to satisfy the explicit deformation demands. The procedures to evaluate the sectional curvature ductility and drift capacity of fiber reinforced polymer （FRP） retrofitted circular concrete columns under simulated seismic loading were studied in this paper. The sectional yield curvature was proposed based on numerical analysis results. The computing formula of an ultimate curvature was established from test results. It was found from test results that the plastic hinge length of FRP-confined circular concrete columns is closely related to the amount of FRP. Data regressions were employed to formulate the plastic hinge length from test results of 29 large-scale columns. The reason why larger amount of FRP beyond a certain value can decrease the plastic hinge length was discussed. The relationship between the amount of FRP and axial load ratio to drift capacity of FRP-confined circular concrete columns was investigated from a parameter analysis. Then the upper bound of the amount of confining FRP for an efficient retrofit was suggested.

关 键 词：FRP约束 加固 曲率延性系数 侧向位移角 塑性铰长度 

分 类 号：TU375.3[建筑科学—结构工程]