预应力混凝土弯箱梁桥支座反力及扭转分析  

Recation and Torsion Analysis of PC Curved Box Girder Bridges

作　　者：张贻能 刘华[2] 俞博[2] 

机构地区：[1]江苏华通工程检测有限公司,江苏南京210005 [2]东南大学交通学院,江苏南京210096

出　　处：《公路工程》2007年第6期34-38,43,共6页Highway Engineering

基　　金：江苏省交通科学研究计划项目(03Y015)

摘　　要：预应力混凝土连续弯箱梁桥容易出现支座脱空和扭转变形过大的问题,针对这一现象,从弯梁桥构造和外界因素等方面着手,采用空间有限元建立全桥仿真模型的方法进行分析,并选取一座曲率半径为60 m的弯梁桥,分析不同支座布置方式下的支座反力和扭转变形等问题。结果显示,预应力钢束产生的预加力和日照温差是弯梁桥出现支座脱空和扭转变形过大的主要因素,而布置合理的支座则是解决该问题的一个有效途径。In this paper, the problem of reaction and torsion of PC curved box-girder bridges was discussed with the space FEM （finite element method） which was used to construct the simulated model, Considering this structure and the factors such as temperature, vehicles etc. A curved bridge that it＇ s curvature radius is 60m was selected and it＇ s reaction and torsion was calculated and analyzed. The results shows that the force of prestress steel and sun＇ s irradiation are the main factors which caused this problem, and reasonable supports configuration is one of the effective solutions.

关 键 词：弯箱梁桥 支反力 扭转变形 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]