碰撞单元阻尼对桥梁碰撞效应的影响

Influences of Element Collision Damping to Pounding Effect of Bridges

城市桥梁的抗震防灾问题日益受到学术界和工程界的高度重视。近几十年的几次大地震表明,地震时桥梁大多因发生碰撞而引发破坏、落梁甚至坍塌等严重灾害。本文以南山路T605主线南段第二联的(20+20+20)三跨简支梁桥为工程背景,借鉴相关规范和桥梁建设过程中的相关经验,采用Kelvin接触单元模型,建立三跨简支梁桥的全桥有限元模型,分析了纵梁间的碰撞单元阻尼对全桥地震响应的影响。

Earthquake-resistant and damage prevention of city bridges have been highly paid attention in academic and engineering circles.According to the violent earthquakes in recent decades,during earthquakes, bridge damages,including girder falling and collapse,are mainly caused by collisions.In this paper,taking the three-span simple-supported beam-bridge located at south mainlineT605 of Nanshan road as example,re-ferring to relativespecifications and bridge construction experiences and adopting contact element model put for-ward by Kelvin to build finite element model of the three-span girder bridge,the influence of element collision damping between girders to bridge seismic response is analyzed.