FRP约束RC矩形空心截面桥墩分析模型及试验验证

针对纤维复合材料(FiberReinforcedPolymer，FRP)约束钢筋混凝土(RC)矩形空心截面墩的抗震性能分析问题，该文提出了一种考虑有效强度系数和面积配箍率的FRP有效侧向约束力的简化计算方法。并通过与试验体桥墩的墩顶水平位移-承载力、墩底截面转动变形-弯矩曲线的对比分析，验证了该文提出简化计算模型的正确性。最后，基于该文提出的简化计算方法，对不同种类FRP约束RC矩形空心截面墩截面的抗弯承载力、曲率、塑性转动能力等抗震性能参数进行了研究，结果表明环包FRP布对空心墩的延性贡献较大，对提高其承载力影响较小。

ANALYTICAL MODEL AND EXPERIMENTAL VALIDATION OF FRP CONFINED BRIDGE COLUMNS with RC RECTANGULAR HOLLOW CROSS SECTIONS

In order to evaluate aseismic performance of Fiber Reinforced Polymer (FRP) confined reinforced concrete (RC) rectangular hollow-bridge columns, a simplified confined concrete model of FRP is proposed by considering the effective strength coefficient and area distribution ratio of FRP hoops. The proposed simplified analytical model is validated to be right and effective by comparing the test results and calculation results of lateral forces vs deformations at the top of bridge piers and rotation deformations vs moments at the bottom section of bridge column specimens. Based on the improved analytical model presented, aseismic performance parameters of flexural capacity, curvature, the plastic rotation capacity of cross sections of a RC rectangular hollow section pier restrained by different types of FRP are investigated. The results show that the loop packaged FRP cloth has a more considerable effect on ductility than the load capacity of FRP restricted RC rectangular hollow-bridge columns.