桥上人行桥对大跨度系杆拱桥抗震性能影响研究

Research on Impact of Footbridge on Seismic Performance of Long-span Bowstring Arch Bridge

大跨度拱桥上设置人行桥结构新颖,探明人行桥对下承式系杆拱桥抗震性能的影响有重要意义。以深圳市某下承式系杆拱桥为研究对象,通过动力时程方法分析成桥阶段是否设置人行桥对全桥抗震性能的影响。研究表明:设置人行桥降低了纵竖向地震作用下桥上拱肋和吊杆的应力,增加了横竖向地震作用下桥上拱肋和吊杆的应力,对于桩基础影响不大。

The structure of footbridge set on long-span arch bridge is novel.It is greatly significant to verify the impact of footbridge on the seismic performance of through bowstring arch bridge.Taking a bowstring arch bridge in Shenzhen as the research object,the impact of setting the footbridge on the seismic performance of the whole bridge in the stage of bridge completion is analyzed by dynamic time history method.The research shows that the setting of footbridge can reduce the stresses of bridge arch rib and boom under the longitudinal and vertical seismic actions,and increase the stresses of bridge arch rib and boom under the transverse and vertical seismic actions,which have little effect on pile foundation.