混凝土自锚式悬索桥抗震设计的图表分析法

为了对混凝土自锚式悬索桥地震响应给出快速评价,基于弹性概念提出了估算混凝土自锚式悬索桥抗震设计的图表分析法.该方法通过混凝土自锚式悬索桥静力分析和自身结构参数查找对应图表中系数,对方案设计和初步设计阶段结构地震响应给出估算.根据已有资料建立了分析模型,考虑几何刚度影响,利用恒载作用下动力平衡方程,输入3条地震波进行了反应谱分析,得出相关图表.最后应用图表法通过实例与有限元分析结果进行对比,说明了该方法可以应用于混凝土自锚式悬索桥方案设计和初步设计阶段抗震设计的地震响应估算.

Figure and Table Method of Concrete Self-anchored Suspension Bridge Seismic Design

To estimate quickly seismic response of the concrete self-anchored suspension bridges,the table and figure seismic design method is presented,it is based on elastic concept.The method gives factors obtained from static analysis of self-anchored suspension bridges and their structure parameters,which can estimate seismic effects for plan design or prime design.Then models of bridges that are constructing or to be constructed are made.Dynamic balance equations which consider effect of geometric nonlinear and dead load are derived,and tables and figures are given for input of three earthquake waves.To compare with result of time history,response spectrum is analyzed.Finally,seismic effect result using this method and FEA of a real bridge are compared,which shows that the method can practically estimate seismic effects of concrete self-anchored suspension bridges in plan design or prime design.