预应力混凝土曲线连续箱梁桥支座布置研究  

Research on Bearing Arrangements of Pre-stressed Concrete Curved Continuous 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1期83-89,共7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：为避免预应力混凝土曲线连续箱梁桥在预应力、外部荷载作用下发生支座脱空的现象,以某互通匝道桥为典型工程,应用空间有限元法,在不同荷载、不同支座布置形式下,分析曲线箱梁桥的支座反力和位移,探讨合理的支座布置形式。结果表明:中间支座全部是墩梁固结的支座布置形式最不易脱空,而固定支座布置在端部截面的支座布置形式最容易脱空。因而得出合理的支座布置可以避免过大的扭转变形、防止支座脱空的结论。To avoid bearing separation of the pre-stressed concrete curved continuous girder bridge under the pre-stressed load and external load, this article takes a ramp as the project background. By FEM the bearing reaction force and displacement of the curved girder bridge are thoroughly analyzed under different loading effects and various bearing arrangements. The reasonable bearing arrangement is discussed. Results show that the use of middle bearings of pier girder consolidation is＇ most unlikely to bearing separation, while fixed bearing at the end sec- tion is most likely to bearing separation. So it is concluded that rational bearing arrangement can avoid big torsional response and bearing separation.

关 键 词：曲线箱梁桥 支座反力 支座脱空 位移 支座布置 

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]