FRP加固钢筋混凝土圆柱侧向变形能力研究

Deformation Capacity of FRP Confined Reinforced Concrete Circular Columns under Simulated Seismic Loading

结构变形能力定量计算是基于性能的抗震设计的重要内容,能确保结构满足不同的性能目标要求。研究纤维增强复合材料(FRP)加固钢筋混凝土(RC)圆柱侧向变形能力计算方法。通过数值分析对FRP加固RC圆柱截面弯矩-曲率关系进行计算,计算结果显示截面极限曲率明显小于试验实测值,两者差异程度受轴压比控制。根据计算结果和试验结果,提出了极限曲率修正计算方法。在此基础上运用等效塑性铰方法对加固柱侧向变形能力进行计算,计算结果与试验结果在FRP用量较小时符合很好,在FRP用量较大时计算结果偏大。对影响FRP加固RC圆柱侧向变形能力的主要参数进行讨论。

The accurate calculation of the deformation capacity of structures is very important to performance-based seismic design,which satisfies the explicit deformation demands.The method to evaluate drift capacity of fiber reinforced polymer（FRP） confined reinforced concrete circular columns under simulated seismic loading is focused.Firstly,the moment-curvature relationship of FRP confined sections of reinforced concrete（RC） circular columns is simulated by numerical analysis.It is found that the calculated ultimate curvature is significantly less than the test result,and the difference is controlled by the axial load ratio of the tested columns.According to the numerical and the test results,an equation is proposed to modify the calculated ultimate curvature.Based on this,the drift capacity can be predicted with the equivalent plastic hinge method.The calculated result agrees well with the test result when FRP amount is low,but it is significantly larger when FRP amount increases.Finally,the main parameters exerting influences on the drift capacity of the FRP-confined RC circular column are analyzed.