考虑结构-水相互作用的连续刚构桥水平地震反应分析

以三水二桥为实例,采用结构有限元法对具有单肢薄壁墩的连续刚构桥进行水平地震反应分析,分析时考虑了桩-土相互作用和结构-水相互作用以及不同水深对结构地震反应的影响。计算结果表明：桩-土相互作用和结构-水相互作用对该种连续刚构桥的抗震是不利的;按反应谱法计算所得桥墩的横向内力较大,按时程分析法计算所得主梁内力和桥墩的纵向内力较大;连续刚构桥抗震设计时应采用反应谱法和时程分析法相结合进行分析,所得的成果和分析结论可供同类桥抗震分析参考。

Horizontal Seismic Response Analysis of Continuous Rigid Frame Bridges Considering Structure-water Interaction

Taking Sanshui 2nd Bridge as an example, horizontal seismic response of continuous rigid frame bridges with single thin piers was studied. Pile-soil interaction and structure-water interaction were considered, and seismic response affected by different water depths was analyzed. The calculated results indicate that it is detrimental to continuous rigid frame bridges when pile-soil interaction and structure-water interaction are considered. Transverse internal force of bridge piers calculated with response spectrum method is bigger; internal force of main girder and longitudinal internal force of bridge piers calculated with time-history analysis method are bigger. The analysis method combining response spectrum with time-history analysis method will be used in seismic design of continuous rigid frame bridges. The results and analysis conclusions provide a reference of seismic analysis to continuous rigid frame bridges.