【摘要】 以汶川地震跨小鱼洞断裂带的小鱼洞大桥地震破坏为研究背景,通过对其震后现场的实地勘察分析,建立了小鱼洞大桥多点地震动激励的动力分析数值模型。考虑到断裂带两侧地震强度的区别,采用三角级数法模拟人工地震波时选用不同的地震峰值加速度,然后对其进行地震破坏数值分析,重点讨论了桥梁地震破坏的薄弱部位及其破坏原因。数值模拟结果基本体现了小鱼洞大桥的实际破坏状况,证明了数值分析模型的有效性。更多还原

【Abstract】 Based on seismic failure of Xiaoyudong bridge across Xiaoyudong fault zone in Wenchuan earthquake,multi-support excitation numerical model for dynamic analysis of the bridge was established after investigating the post-earthquake field.Considering the difference of earthquake intensities in both sides of the fault zone,artificial earthquake waves were simulated by trigonometric series method with different seismic peak accelerations.Then the seismic failure numerical analysis was carried out,the weak areas of seismic failure and their reasons were discussed particularly.Numerical simulation result embodies actual failure conditions of Xiaoyudong bridge on the whole and demonstrates the validity of the analysis model.更多还原