飘浮体系斜拉桥纵向抗震计算的单塔模型

A tower model for seismic response prediction of floating cable-stayed bridge in longitudinal direction

通过全桥模型计算结果与单塔模型计算结果的对比,讨论了集中质量在塔上锚固区处堆聚位置,定义了一个结构动力特性和结构地震反应的修正系数,提出了飘浮体系斜拉桥塔纵桥向地震反应计算的单塔模型。多个工程实例的分析结果表明,采用单塔模型的典型误差在15%左右,精度可以满足工程抗震设计的要求,使桥塔的抗震计算得到简化。

A tower model was suggested for seismic response prediction of floating cable-stayed bridge in longitudinal direction. A mass equivalence of the girder and the cables was presented by a modified factor. The results of example cable-stayed bridges show that the typical errors of the tower model are about 15%. The suggested model may be used to simplify the seismic design of cable-stayed bridges.