斜港大桥减隔震设计

Seismic Isolation Design of Xiegang Bridge

苏州斜港大桥新建工程为主跨180 m三跨双层拱梁组合桥,全钢结构。目前该桥型国内不多见。针对大桥的地震响应分析及减隔震设计作了详细论述,给出了该桥的抗震设计思路和减隔震设计措施。分别采用了反应谱和非线性时程分析方法对桥梁结构进行了计算分析,经过对多种工况的计算分析比较,最终采用粘滞阻尼器来减小结构的地震响应。

Suzhou Xiegang Bridge is a newly-constructed three span two-tier whole steel arch beam bridge with a main span of 180 m. Currently, this bridge type is rarely seen in China. The seismic respeonse analysis and seismic isolation design method were discussed in detail in this paper. The seismic design idea and seismic isolation and reduction method of this bridge were given out. Viscous damper was finally adopted to decrease the seismic response of its structure, through calculating the bridge structure with the methods of response spectrum and nonlinear time-history and comparing the calculations of loading operating conditions. The results provide a reference for the seismic design of similar bridges in the future.