预应力混凝土斜拉桥施工过程中的力学行为研究  

Study on Mechanical Behavior of a Prestressed Concrete Cable-stayed Bridge in Construction State

作　　者：张建民 肖汝诚[2] 

机构地区：[1]广州市市政工程安全质量监督站,广州510050 [2]同济大学桥梁工程系,上海200092

出　　处：《中国工程科学》2007年第5期36-41,共6页Strategic Study of CAE

基　　金：国家自然科学基金资助项目(50408037);广州市科技计划攻关资助项目

摘　　要：斜拉桥施工过程中的力学行为研究是一项涉及斜拉桥质量和安全的关键技术问题。采用空间非线性有限元模拟了某大跨度预应力混凝土斜拉桥主梁的悬臂浇筑过程,引入一阶最优化计算方法来确定斜拉桥的合理施工状态,求出各施工阶段的斜拉索张拉索力和主梁的预抛高值,并讨论了物理非线性和几何非线性等因素对桥梁施工的影响,提出了减小非线性影响的措施。Because of the increasing span of concrete cable-stayed bridge, the construction simulation recently becomes more focusing on both the design and construction. This paper introduces the optimization theory and method into the calculation of cantilever construction of girders. The example bridge is a long-span prestressed concrete cable-stayed bridge with a 370 m central span length under construction in China. Using spatial nonlinear FEM, the actual cantilever construction process of concrete box-shaped girders is simulated, the tensioning force of cables as well as the prearranged height of girders in construction state is obtained. At the same time, the influence of structural geometric nonlinear characteristics and physics nonlinear characteristics in the cable force optimum are investigated, the measures to reduce the influence are put forward.

关 键 词：斜拉桥 一阶分析法 合理施工状态 非线性 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]