【摘要】 以西宁通海路跨越湟水河斜拉桥为研究对象,建立全桥三维空间有限元模型,分别采用漂浮与半漂浮的结构体系计算了动力特征值,分析了不同结构体系对结构动力特性所产生的影响。考察了结构的刚度和边界条件设置情况,在动力特性计算基础上,采用地震反应谱多维抗震分析方法,考虑了拉索垂度的非线性影响及桩—土—结构相互作用,采用不同等级的地震动输入,考察结构的抗震性能,对结构设计提出了改进措施及建议,为较宽独塔单索面斜拉桥的地震力分析提供了工程实践经验及有效的分析方法。更多还原

【Abstract】 Spatial finite model for whole bridge with floating or semi-floating systems are separately used to calculate dynamic proper value of cable-stayed bridge which strides over the Huangshui River on Tonghai Rode in Xining City.The influence of different structure systems on dynamic proper value is analyzed.Rigidity and boundary conditions of bridge are examed in this paper.Based on this,with multi-dimensional seismic response spectrum under different seismic grade,considering cable sag effect and pile-soil interaction,the anti-seismic performance of structure is examed.The improved measure and suggestion is put forward for the design of bridge.The paper supports engineering experience and efficient analysis method of seismic response for cable-stayed bridge with single tower,single cable and wide bridge deck.更多还原