预应力混凝土斜拉桥塔梁临时固结构造空间受力分析  

Analysis of Spatial Mechanical Behavior of Pylon and Girder Temporary Fixity Structures of PC Cable-Stayed Bridges

作　　者：荆国强[1] 李欣然[1] 陈德伟[1] 

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《桥梁建设》2009年第6期31-34,共4页Bridge Construction

摘　　要：预应力混凝土斜拉桥跨径不断增大,主梁宽度也不断增加,其空间效应越来越明显,在其主梁的悬臂施工过程中,通常采用的塔梁临时固结方式常常导致主梁0号块附近开裂。应用MIDAS/Civil结构分析软件,对采用临时固结方式的斜拉桥空间结构进行施工仿真分析。结果表明,常用的塔梁临时固结方式的空间效应导致了主梁混凝土的开裂。对临时固结构造的设置提出建议。The restless increase of the span length and main girder width of prestressed concrete （PC） cable-stayed bridges exhibits the more and more significant spatial effect of the bridges. In the process of cantilever construction of the main girders of the bridges, the commonlyused method of pylon and girder temporary fixity often results in cracks in the vicinity of Segments No. 0 of the girders. The structural analysis software MIDAS/Civil is used herewith to simulate and analyze the construction of the spatial structures of the cable-stayed bridges used with the temporary fixity. The results of the simulation and analysis show that it is the spatial effect of the temporary fixity that causes the cracks in the girders and the corresponding proposal for setting the temporary fixity structures is made.

关 键 词：斜拉桥 预应力混凝土结构 悬臂灌筑架桥 塔梁临时固结 空间分析 有限元法 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]