马鞍山三塔悬索桥抗震性能研究

以马鞍山三塔悬索桥的工程设计为背景,根据大桥结构的重要性确定了桥梁在两种概率水平的地震作用下的设防标准,并提出了相应的性能目标.根据桥址处地震危险性分析研究报告所给定的地震动数据对大桥进行反应谱分析和非线性动力时程分析,研究该桥的动力特性和地震反应特点,根据分析结果研究确定优化桥梁的抗震性能措施.经过计算分析比较得出,通过加设合理的液压阻尼装置可以减小结构在地震作用下的结构响应,提高全桥结构的能力需求比,增强了该桥的抗震性能水平,有利于桥梁结构在地震中的安全.

Research of Seismic Performance of Ma'anshan Three-pylon Suspension Bridge

According to the structural importance of Ma' anshan three-pylon suspension bridge, a seismic fortification criterion under two kinds of earthquake action probability level was determined and the corresponding target of seismic performance was brought out based on the design of the bridge. Ground motion parameters at the site of the bridge were obtained from the seismic risk analysis report, and the seismic response analysis of the bridge was undergone accordingly by means of the seismic response spectnun method and the nonlinear seismic time-history dynamic method to study the dynamic character and response under earthquake action. The optimization measures of the bridge seismic performance were determined based on the analytical result. It is concluded that the bridge seismic response under earthquake action can be decreased and the capability-demand ratio can be increased by using reasonable hydraulic damper to enhance the seismic performance and safety of the bridge.