考虑双轴水平力耦合效应的RPC箱型桥墩恢复力模型试验研究

通过3个施加常轴力的RPC箱型桥墩试件的水平反复荷载试验,考虑水平荷载作用方向对RPC箱型墩抗震性能的影响,分析各试件滞回特性和骨架曲线的特点,对影响RPC箱型桥墩恢复力模型的主要因素进行数值回归分析,建立了计入双轴水平力耦合效应的RPC箱型桥墩恢复力模型。利用基于平截面假定的纤维模型法编制考虑轴力二阶效应的双轴压弯构件非线性分析程序,并对RPC箱型桥墩试件的骨架曲线和滞回曲线进行数值模拟。通过与试验结果进行分析对比表明:所提出的恢复力模型具有较好的精确性,能够较好地模拟和反映RPC箱型桥墩的抗震性能。

Experimental study on the restoring force model of Reactive Powder Concrete box piers under biaxial horizontal loads

Based on cyclic loading tests of three reactive power concrete box pier samples under invariable axial force and reversed horizontal load,hysteretic properties and characteristics of the skeleton curves of the samples were analyzed.At the same time,the factors affecting the restoring force models of the samples were considered and the numerical regressive analysis method was used to establish the restoring force model of reactive power concrete box piers under biaxial horizontal loads.In addition,the numerical simulation analysis was performed with the program compiled with the fiber model method taking into account the second-order effects of the axial force and biaxial loads.The results are in good agreement with the experimental results,which shows that the restoring force model presented in this paper can accurately simulate and reflect the seismic behavior of reactive power concrete box piers.