转体施工大悬臂T构的抗风性能研究  

Study on Wind-resistance Behavior of Rotation Contructed Large Cantilever T Structure

作　　者：张谢东[1] 黄伟文[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2015年第1期9-11,15,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：内蒙古自治区交通科技项目资助(批准号:NJ-2012-18)

摘　　要：采用平转施工的T形刚构桥梁在转体之前,拆除施工支架,处于大悬臂状态,结构刚度较小,在风的作用下稳定性较差.结合内蒙古集宁市的京包铁路分离式立交桥,桥址处多阵风且风速较大,分析该转体施工T形刚构桥梁的抗风性能,通过对该桥进行了抖振时域分析,得到其位移时程结果.大悬臂T构的结构横向刚度最小,位移最大.结果表明结构在风荷载的作用下较安全,但风荷载的作用不可忽略.Before the T-shaped rigid frame bridge swivel,we need to remove the construction falsework.Then the bridge is in a large cantilever state,with small stiffness.It has poor stability under the action of wind.This paper analyzed the wind resistance performance of the T-shaped rigid frame bridge combine with the Beijing-Baotou railway separate package overpass in Jining,Inner Mongolia.Considering the bridge site in a place with big wind velocity,this paper has great practical significance and theoretical value.By conduct the time domain buffeting analysis of the bridge,the paper got the time history displacement response result.The large cantilever T structure has smaller lateral stiffness and larger displacement.The results show that the structure is secure under wind load effect.However,the role of wind load can not be ignored.

关 键 词：转体施工 大悬臂 抖振时域分析 

分 类 号：U44[建筑科学—桥梁与隧道工程]