摘要
在等墩高的多跨连续梁桥中,虽然相邻联的基本振动周期完全相同,地震动的行波效应可能导致伸缩缝处相邻梁体间发生碰撞。采用接触单元模拟伸缩缝处相邻梁体间的碰撞,采用阻尼器来反映碰撞过程中的能量损失,应用非线性时程方法研究了地震动行波效应对连续梁桥纵向地震碰撞反应的影响。研究结果表明:地震动的行波效应在伸缩缝处相邻梁体间引起较大的相对位移,导致相邻梁体间发生碰撞,碰撞力的大小随表面视波速不同而不同。行波效应引起的伸缩缝处相邻梁体间碰撞,可能增大伸缩缝处相邻梁体间以及墩梁间相对位移,甚至造成上部结构在地震中发生落梁破坏,在连续梁桥的抗震设计与评估中,应该引起足够的重视。
In multiple continuous girders with piers of the same height, although natural periods of adjacent segments at expansion joints are the same, pounding between adjacent segments at expansion joints can be induced by seismic wave passage effect. In this paper, the seismic pounding responses between adjacent girder decks at expansion joints of continuous girder bridges due to seismic wave passage effect were investigated by the nonlinear time history analysis method. In analysis, contact element is used to model pounding and damper is used to describe the energy dissipation during collision. The results show that seismic wave propagation effect can cause relative displacements between adjacent bridge decks enough large to induce impact at expansion joints. The magnitude of pounding force depends on apparent velocity of seismic wave. Pounding can amplify relative displacements between adjacent bridge decks or piers and decks, which may even cause bridge decks to drop from piers and collapse. Therefore, influences of seismic wave passage effect on longitudinal seismic pounding response should be emphasized in seismic design and assessment for continuous girder bridges.
出处
《工程力学》
EI
CSCD
北大核心
2007年第11期100-105,共6页
Engineering Mechanics
基金
国家自然科学基金资助项目(50578118)
河北省教育厅科研计划资助项目
关键词
桥梁
地震
行波效应
碰撞
地震反应
bridges
earthquake
seismic wave passage effect
pounding
seismic response
作者简介
王军文（1971），男，山西天镇人，副教授，博士，从事桥梁抗震与组合结构研究（E-mail：wjunwen2901@163．com）;
张运波（1971），男，河北馆陶人，讲师，硕士，从事桥梁施工控制、检测及加固技术研究（E—mail：zhangyb_000323@163.com）；
李建中（1963），男，湖北咸丰人，教授，博士，博导，主任，从事桥梁抗震理论研究（E-mail：Lijianzh@mail.tongji.edu.cn）；
范立础（1933），男，浙江镇海人，教授，中国工程院院士，长期从事桥梁抗震理论研究（E-mail：Lcfan@mail.tongji．edu．cn）．
