摘要
为给钢管混凝土系杆拱桥施工监控提供理论依据,以南水北调工程南阳市姚湾跨渠公路桥为背景,采用有限元软件建立全桥三维空间模型,详细考虑混凝土灌注次序、混凝土徐变效应、吊杆张拉次序、系梁多次张拉等环节,对结构施工全过程的内力和变形历程及系梁浇筑过程中支架受力进行分析。结果表明,施工过程中拱肋钢管及管内混凝土应力满足规范要求;各分支钢管中混凝土的压应力与混凝土灌注次序有关;钢管内灌注混凝土的徐变会使钢管混凝土截面发生应力重分布;拱肋支架满足整体稳定性和分支稳定性要求。
To provide the theoretic bases for the construction monitoring and control of con- crete-filled steel tube （CFST） tied arch bridge, the Yaowan Water Channel Highway Bridge in Nanyang City of the South-to-North Water Diversion Project was cited as an example, the finite element software was used to set up the three-dimensional model for the whole bridge of the bridge, the internal forces and deformation history of the bridge in the whole construction process and the force conditions of the scaffoldings for concreting of the tie beams were analyzed in de- tailed consideration of the various factors of the concreting sequences, concrete creep effect, hanger tensioning sequences and multi-time tensioning of the hangers. The results of the analysis show that the stress of the arch rib steel tubes and the concrete in the tubes in the construction process can meet the relevant requirements in the codes. The compressive stress of the concrete in the different branch steel tubes is related to the concreting sequences. The creep of the concrete in the tubes can cause the stress redistribution in the sections of the CFST and the scaffoldings for concreting of the arch ribs can meet the requirements of global and local stability.
出处
《桥梁建设》
EI
CSCD
北大核心
2012年第6期27-32,共6页
Bridge Construction
关键词
系杆拱
钢管混凝土结构
支架法施工
有限元法
稳定性
tied arch
concrete-filled steel tube structure
scaffolding method construction
finite element method
stability
