【摘要】 为了确定一致地震作用下独塔斜拉桥的合理抗震约束体系,首先对独塔斜拉桥在纵桥向和横桥向约束体系的传力机理进行了研究,然后以某独塔双索面斜拉桥为工程实例,分别对结构纵横向抗震体系进行了优化分析。分析结果表明,塔梁之间设置纵向弹性索可以在降低桥塔地震弯矩的同时控制主梁位移;墩、梁之间通过设置纵向弹性索,可以根据桥墩抗弯能力调整地震力的分配,起到提高结构整体抗震性能的作用。对于不等跨混合梁独塔斜拉桥,边跨过渡墩采用弹性索限位,可以合理分配横向地震力,从而达到提高结构整体横向抗震性能的目标。更多还原

【Abstract】 In order to find out the appropriate aseismic constraint system for single tower cable-stayed bridge under consistent earthquake,principles of distributing the inertia forces longitudinally and transversally are analyzed firstly.Then the seismic responses of single tower cable-stayed with different longitudinal constraint systems and lateral constraint systems are calculated by taking a typical bridge as studying object.The results indicate that,seismic responses of tower could be reduced by setting flexible cable between tower and girder longitudinally.The distribution of horizontal seismic force could be optimized by setting flexible cable between pier and girder longitudinally.The distribution of transversal seismic force could be optimized by setting flexible cable between pier and girder transversally,so the earthquake resistance of structure had been improved accordingly.更多还原