地震作用下斜交连续梁桥碰撞效应分析  

Collision effect analysis of skew continuous bridge under seismic response

作　　者：卢明奇[1] 杨庆山[1] 李英勇[2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]山东省交通厅公路局,山东济南250002

出　　处：《中国矿业大学学报》2012年第2期289-292,326,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51008013);山东省交通科技计划项目(2009Y007);中央高校基本科研业务费专项资金项目(2009JBM060)

摘　　要：了解强烈地震下上部梁体结构与桥台间碰撞效应对斜交连续梁桥的地震反应影响十分重要,以唐子河大桥为原型,建立了不同斜度的斜交连续梁桥非线性有限元计算分析模型.利用非线性时程分析方法,对比研究了不考虑碰撞效应和考虑碰撞效应两种情况下的斜交连续梁桥地震反应特征规律.结果表明:梁体与桥台间的碰撞效应会使斜交连续梁桥的上部结构产生扭转位移,且随着斜度的增大而增大;考虑碰撞作用的桥墩最大扭矩明显大于不考虑碰撞作用的桥墩最大扭矩.在斜交连续梁桥的抗震设计过程中如不考虑这种碰撞作用,会低估桥墩的地震扭矩效应,增大下部墩柱结构的设计风险.In order to study the effect of collision between the superstructure ana abutment on the seismic response of skew continuous bridges, the Tangzihe bridge was used as a prototype, nonlinear finite element models of skew continuous bridges with different skew angles were de- veloped. The characteristic of seismic response of skew continuous bridge with the collision effect considered or not were studied using a nonlinear time history analysis method. The re- suits show that the torsional displacement of superstructure will be induced by the collision and increase with the increasing of skew angle. The maximum seismic torques in the piers of the skew continuous bridge calculated with the collision effects considered are obviously larger than that calculated without the collision effects considered. If the collision effect was ignored dur- ing the process of seismic design, the seismic torque would be underestimated and the risk of seismic damage might be improved.

关 键 词：斜交连续梁桥 地震反应 斜度 碰撞 扭转 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]