部分斜拉桥施工力学性能分析  

Analysis of Mechanical Properties of Extradosed Bridge in Construction Process

作　　者：王艳[1] 魏春明 陈淮[1] 

机构地区：[1]郑州大学土木工程学院,河南郑州450001 [2]河南新开元路桥工程咨询有限公司,河南郑州450016

出　　处：《桥梁建设》2012年第2期46-52,共7页Bridge Construction

基　　金：河南省杰出人才计划项目(084200510003)~~

摘　　要：为了解多跨部分斜拉桥施工过程中结构力学性能的演变过程,从而对桥梁进行有效的施工控制,以开封黄河二桥主桥为例,采用有限元程序MIDAS Civil建立全桥有限元模型,进行施工过程仿真计算,分析其施工力学性能。分析结果表明,主梁成桥时压应力最大,次边跨初步和最终合龙对边塔塔底应力影响较大;中塔偏位较小,边塔在次边跨初步合龙阶段易产生较大纵向偏位;索力变化较小,可一次性张拉到位;桥梁整体稳定性较好;桥梁在各施工阶段的第1阶失稳均为桥塔面外反对称失稳。To look into the development of structural mechanical properties of multi-span ex- tradosed bridge in construction process, thus to carry out effective construction control of the bridge, the main bridge of the Second Kaifeng Huanghe River Bridge was taken as an example, the finite element program MIDAS Civil was used to set up the model for the whole bridge, the simulation calculation of the bridge in the construction process was made and the mechanical properties of the bridge were analyzed. The results of the calculation and analysis indicate that the compressive stress of the main girder reaches the greatest after completion of the bridge and the initial and final closure of the secondary side span has considerable influence on the stress in the side pylon base. The longitudinal displacement at the top of the middle pylon is little, but the top of the side pylon is prone to great longitudinal displacement at the stage of the initial closure of the secondary side span. The changing of stay cable forces is little and the cables can be ten- sioned in place in one time. The global stability of the whole bridge is good and at various con- struction stages, the first order instability of the bridge is all of the out-of plane asymmetric in stability of pylon.

关 键 词：部分斜拉桥 桥梁施工 悬臂灌筑架桥 有限元法 静力学 稳定性 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]