摘要
我国的中小跨径桥梁普遍采用板式橡胶支座并在横向设置抗震挡块,但现行的桥梁抗震设计规范对挡块的设置方式并没有明确的规定。为了探寻一种对桥梁下部结构抗震有利的挡块设置方式,该文采用非线性时程分析方法,考虑横向抗震挡块与上部结构的碰撞效应,研究两跨30m连续梁中横向抗震挡块对桥梁结构地震反应的影响,分析挡块和上部结构之间初始间隙对结构地震反应的影响规律。最终,从保护桥梁下部结构并能防止落梁的角度出发,提出一条抗震设计思路,为横向抗震挡块的合理设置提出建议。
The plate elastomeric pad bearing is commonly used for the small-span and middle-span bridges and the seismic block is laterally set up in China, but there is no specific stipulation for the setup method of seismic block in the current bridge seismic design standard. In order to find a setup method of seismic blockadvantageous for seismic resistance of bridge substructure, the article studies the influence of lateral seismic block in two-span 30-m continuous beam on the earthquake reaction of bridge structure, analyzes the influence law of the primary gap between seismic block and superstructure on earthquake reaction of structure by using non-linear time history analysis method and considering the collision effect of lateral seismic block and the superstructure, and finally puts forward a seismic design idea and a proposal for the reasonable setup of lateral seismic block from the angle of protecting the bridge substructure and able to prevent beam falling.
出处
《城市道桥与防洪》
2014年第11期94-98,23-24,共5页
Urban Roads Bridges & Flood Control
关键词
抗震挡块
两跨连续梁
初始间隙
碰撞效应
seismic block,two-span continuous beam,primary gap,collision effect
