FRP约束钢筋混凝土矩形空心桥墩的滞回模型  

Hysteretic Model of FRP Confined RC Bridge Pier with Rectangular Hollow Section

作　　者：董振华[1,2] 杜修力[1,2] 韩强[1,2] 

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]首都世界城市顺畅交通协同创新中心,北京100124

出　　处：《中国公路学报》2015年第1期30-37,共8页China Journal of Highway and Transport

基　　金：国家重点基础研究发展计划("九七三"计划)项目(2011CB013602);国家自然科学基金项目(50938006)

摘　　要：为了评价纤维增强复合材料(FRP)约束钢筋混凝土(RC)空心桥墩的抗震性能,对4根FRP约束矩形空心桥墩进行了水平单向低周反复荷载作用下的拟静力试验研究,及相应的FRP约束矩形空心截面弯矩-曲率数值分析。根据FRP约束矩形空心桥墩实测滞回曲线的特点和FRP约束矩形空心截面弯矩-曲率的模拟结果,基于现有RC柱的弹塑性滞回模型,提出了四折线水平位移-力骨架曲线模型及相应受力阶段滞回规则下的滞回模型。结果表明:新的滞回模型可正确反映FRP约束矩形空心桥墩的有效刚度衰减、反向加载规则和捏缩效应,其FRP约束矩形空心桥墩的水平位移-力计算滞回曲线与试验结果吻合良好。In order to estimate the seismic performance of the fiber reinforced polymer （FRP）confined RC bridge piers with hollow section, the quasi-static test was carried out on four FRPconfined RC bridge piers with rectangular hollow section under unidirectional horizontal load, andnumerical simulation method was applied to analyze the moment-curvature relationship of FRPconfined RC rectangular hollow sections corresponding to the tested bridge piers. In view of theexperimental hysteretic curves＇ characteristics of the FRP confined RC bridge piers with hollowsection and simulated moment-curvature results of FRP confined RC rectangular hollow section,based on the existing elastic-plastic hysteretic models of RC columns, a curve model of horizontaldisplacement-force with four-polyline skeleton curve a hysteretic model under hysteretic rules forcorresponding loading stages were proposed. The results show that the proposed hysteretic modelcan correctly present the effective stiffness declining, reverse loading rules and pinch effect ofFRP confined RC bridge pies with rectangular hollow section and the calculated results agree wellwith the experimental results.

关 键 词：桥梁工程 桥墩 拟静力试验 滞回模型 纤维增强复合材料 矩形空心截面 

分 类 号：U443.2[建筑科学—桥梁与隧道工程]