8度地震区连续梁桥下部结构抗震设计研究

现行《公路桥梁抗震设计细则》引入了二级设防的概念,细化了弹性及弹塑性理论在抗震设计上的应用,增加了桥梁延性抗震设计和抗震分析建模原则的规定;桥梁震害以下部结构最为严重。该文分析列举了桥梁下部结构震害的几种类型,并针对这些震害,以反应谱理论为基础,以国道211线某立交枢纽工程为例,利用MIDAS有限元程序对8度区常规连续梁桥下部结构建模分析。

Study on Seismic Design of Substructure of Continuous Beam Bridge in 8-degree Seismic Zone

The conception of Class II Prevention is introduces into the current Detailed Rules for Seismic Design of Highway Bridge, details the application of the elastic and elastoplastic theory in seismic design, and adds the regulations for the principle to set up the seismic design and seismic analysis model of bridge ductility. The substructure of bridge is most seriously harmed by the earthquake. The article analyzes several types of seismic damage of bridge substructure, and aiming at these seismic damages, analyzes the conventional continuous beam bridge substructure in 8-degree seismic zone by using MIDAS finite element program, taking an interchange hub project of National Highway 211 Line as an example and based on the response spectrum theory.