圆心角及支座布置对圆弧曲线箱梁桥支座反力的影响  

Effect of Central Angle and Bearing Arrangement on Bearing Reaction of Arc Curved Girder Bridge

作　　者：许莉[1] 房贞政[1] 洪适[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《南昌大学学报（工科版）》2009年第2期167-172,共6页Journal of Nanchang University(Engineering & Technology)

基　　金：福建省教育厅科技基金资助项目(JB07016);福州大学科技发展基金资助项目(2007-XY-14)

摘　　要：针对目前工程中出现的圆弧曲线箱梁桥支座脱空的现象,文中以福州某大桥立交匝道为工程背景,采用有限元法分析了不同圆心角和不同支座布置情况下,该曲线连续箱梁桥支座反力的变化规律。结果表明:随着圆心角的增大,端部截面的内侧支座及固定支座布置在端部截面的支座形式最容易出现支座脱空;中间支座全部墩梁固结布置以及纵向约束和横向约束分别设置在不同截面的支座布置最有利。因此考虑圆心角的变化选择有利的支座布置形式可以避免支座脱空现象。Aiming at bearing separation of the arc curved girder bridge in engineering field, using certain bridge overpass ramp in Fuzhou as the research subject, this article uses the space finite method to analyze the effect of various central angles and bearing arrangement on bearing reaction of arc curved girder bridge. The results show ： with the increase of the central angle, inside bearing of the end section and fixed bearing at the end section are likely to cause the bearing separation. The bearing arrangement of the middle bearings of pier girder consolidation and the longitudinal and lateral restraint at the different section are ideal. So rational bearing arrangement based on various central angles can avoid bearing separation.

关 键 词：桥梁工程 曲线箱梁桥 支座布置 圆心角 支座脱空 

分 类 号：U448.42[建筑科学—桥梁与隧道工程] TU997[交通运输工程—道路与铁道工程]