水平单调载荷作用下的桩基桥墩滞回特性

为研究桩基桥墩-地基系统的非线性性能,根据模型与原型的物理相似关系制作1∶5比例的桩基桥墩模型. 采用力-位移混合控制加载的拟静力试验方法,通过在墩顶施加水平单调增加载荷,得到墩顶水平载荷下桩基桥墩的载荷-位移滞回曲线、骨架曲线和滞回特性. 用非线性弹簧单元模拟土体、用梁单元模拟桩和桥墩,建立模型桥墩的计算模型. 计算模型的骨架曲线与试验模型的骨架曲线吻合较好,表明采用非线性弹簧单元和梁单元分别模拟土体和桩是可行的,可以为考虑土-结构相互作用时的桥梁抗震分析提供参考依据.

Hysteretic characteristics of pile-supported bridge piers underlevel monotonic load

To research on the nonlinear performance of bridge pier-foundation system, a 1:5 scale pile-supported bridge pier model is made considering the physical similarity between the prototype and the model. The pseudo-static test method that uses force-displacement compound control load is utilized, and the hysteretic curves, skeleton curves and hysteretic characteristics of load-displacement relations of pile-supported bridge piers under level monotonic load are obtained by imposing load at the top of the pier. The computation model of the model pier is built by using nonlinear spring element to simulate soil and beam element to simulate piers and piles. The skeleton curves of the computation model is well in agreement with the one of the test model and it is shown that it is feasible to use nonlinear spring element to simulate soil and beam element to simulate piles, and so it can provides reference to the seismic resistance analysis of bridges that considers soil-structure interaction.