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针对纤维复合材料(Fiber Reinforced Polymer,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。
Aiming at the seismic performance analysis of rectangular reinforced concrete (RC) rectangular hollow section pier with Fiber Reinforced Polymer (FRP), this paper presents an effective lateral restraint force of FRP considering effective strength coefficient and area stirrup ratio Simplify the calculation method. And by comparing with the horizontal displacement-bearing capacity and the rotational deformation-bending moment curve of pier bottom of test pier, the correctness of the simplified calculation model is verified. Finally, based on the simplified calculation method proposed in this paper, the seismic performance parameters such as flexural capacity, curvature and plastic rotation of RC rectangular cross-section pier with different types of FRP beams are studied. The results show that the FRP- The contribution of ductility is larger, which has less impact on the improvement of bearing capacity.