Abstract: Taking a high-speed railway three-span continuous beam bridge as an example, a three-dimensional finite element model of the bridge-soil-pile system is established using ABAQUS finite element software. Nonlinear spring elements combined with damping elements are used to simulate the pile-soil interaction, and nonlinear dynamic time-history analysis is conducted on the finite element model. The effects of three seismic waves and three types of site soil conditions on the structural seismic response are compared. Compared with the calculation model without considering pile-soil interaction, the research results indicate that the influence of pile-soil interaction cannot be ignored, and considering the pile-soil interaction will significantly increase the displacement and acceleration of the pier top, and pier base shear force. Different seismic waves and site soil conditions also have a large impact on the analysis results; the softer the soil conditions of the site, the more significant the impact of pile-soil interaction on the seismic response of the bridge.

Key words: continuous beam bridge, pile-soil interaction, nonlinear analysis, seismic response, site type

摘要： 以一座高速铁路三跨连续梁桥为例,利用ABAQUS有限元软件建立了桥梁-土-桩基础的三维有限元模型,用非线性弹簧单元及阻尼单元模拟桩-土的相互作用,并对有限元模型进行非线性动力时程分析。比较了3条地震波及3种场地土条件对结构地震响应的影响。分析结果表明:与不考虑桩-土相互作用的计算模型相比,桩-土相互作用的影响不容忽视,显著增大了墩顶位移、墩顶加速度以及墩底剪力3个方面的地震响应;不同地震波及场地土条件对分析结果的影响也比较大,场地土越软,桩-土相互作用的影响越显著。

关键词: 连续梁桥, 桩-土相互作用, 非线性分析, 地震响应, 场地类型