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对某大跨度悬索桥进行3向地震反应谱响应分析,考虑不同构件阻尼比对悬索桥地震响应产生的不同影响.首先通过设定不同构件阻尼比的情况进行模态分析,以振型贡献系数最大值所对应的模态阻尼比作为一个方向结构的整体阻尼比;然后采用反应谱法获取该方向上结构的地震响应.通过对结构的地震响应分析发现,不同构件阻尼比对结构地震响应的影响不容忽视;《公路桥梁抗震设计细则》中对悬索桥整体阻尼比不宜大于0.02的建议会使结构地震响应偏大,从而使桥梁设计偏于安全.
The seismic responses of a long-span suspension bridge subjected to 3-direction seismic response are analyzed, and the different influences of different components on the seismic response of the suspension bridge are considered. Firstly, the modal analysis is performed by setting the damping ratio of different members. The corresponding modal damping ratio is taken as the overall damping ratio of one direction structure.Seismic response of the structure in this direction is obtained by using response spectrum method.The seismic response analysis of the structure shows that the damping ratio of different components can not affect the seismic response of the structure Ignored; “Highway Bridge Seismic Design Rules” in the suspension bridge overall damping ratio should not be greater than 0.02 recommendations will make the structure of the earthquake response is too large, so that the partial design of the bridge safety.