动力相互作用对跨海连续梁桥地震响应的影响

Influence of Dynamic Interaction on Seismic Response of Sea-crossing Continuous Girder Bridge

为研究水-结构相互作用和桩-土相互作用对跨海桥梁抗震性能的影响,以某跨海桥梁工程的非通航孔连续梁桥为例开展了结构地震响应分析。基于数值分析软件,建立了桥梁非线性有限元模型,分别通过附加质量和p-y曲线的形式考虑了水-结构相互作用和桩-土相互作用。通过对实际参数下桥梁的多种工况的对比分析发现:水-结构相互作用对结构动力特性和动力响应的影响相对较小,对桩基响应的影响比桥墩的大;桩-土相互作用的影响较显著;建议结构抗震分析时同时考虑两者影响。

To explore the effects of water-structure interaction and pile-soil interaction on the seismic performance of sea-crossing bridges,we carried out the seismic response analysis of the structure by taking a typical non-navigable continuous girder bridge of a sea-crossing project as an example.Based on the numerical analysis software,we established a nonlinear finite element model of the bridge considering the water-structure interaction and the pile-soil interaction by means of adding mass and p-y curve respectively.Through comparing the responses of bridges with actual parameters in various working conditions,we found that the impact of water-structure interaction on the dynamic characteristics and responses of the structure is relatively small,while the influence on the response of pile foundation is greater than that on bridge pier,and the influence of pile-soil interaction is relatively significant.It is suggested that the effects of both water-structure interaction and pile-soil interaction should be considered in seismic analysis of structures.