【摘要】 某在建的公铁两用斜拉桥为双塔三索面漂浮体系,建立了该桥的动力计算模型,并获得了此桥的动力特性。在求得了该桥的等效阻尼比,并对反应谱进行了长周期段和阻尼影响修正的前提下,进行了该漂浮体系钢-混凝土组合结构斜拉桥的地震反应谱响应分析。分析结果表明,对于钢-混凝土组合结构,必须求出其整体结构的等效阻尼比,以此阻尼比为依据,对反应谱进行阻尼影响的修正,同时应考虑反应谱长周期段取值对长周期结构地震反应谱响应的影响。更多还原

【Abstract】 The building highway-railway cable stayed bridge is a float system with twin towers and three cable plane,and the dynamic calculation model was established for getting the dynamic property of the bridge.In the premise of getting the bridge’s equivalent modal damping ratios and modifying the long period sector and the damping effect of the spectrum,a seismic spectrum response analysis was done.All the results show that,to the composite structure of steel-reinforced concrete,it is necessary to calculate the equivalent damping ratio of the overall structure and modify the damping effect of the spectrum.Simultaneously,the long period response spectrum value for the effect of the seismic spectrum response of the long period structure should be considered.更多还原