摘要
针对现代大跨预应力混凝土(P.C.)斜拉桥的结构及受力特点,提出用实体退化单元建立P.C.斜拉桥的悬浇过程分析的三维模型;将预应力筋作为结构的一部分,用等效节点荷载模拟预应力的张拉效应;用三参数粘弹性模型模拟混凝土徐变效应;根据挂篮牵索锚固点处的变形协调条件,导出了P.C.斜拉桥混凝土悬浇效应的计算公式.并以一P.C.斜拉桥为对象,进行了应用研究.结果表明:与平面分析方法相比,本方法可较好地预测索力的变化情况,为施工监控及施工过程验算提供可靠依据.
According to structure feature of modern prestressed concrete （P. C. ） cable-stayed bridge and its stress characteristics, degenerated solid element was adopted to build 3D models of cantilever casting analysis for P. C. cable-stayed bridge. The prestressed reinforcement was taken as a part of structure, and the prestressing effect was simulated by equivalent node loads. The concrete creep effect was computed by a three-parameter viscoelastic model. The formula to calculate the action of concrete casting was deduced on the basis of the deformation compatibility condition of trailing cable＇s anchorage. One P.C. cable-stayed bridge as an example was studied in application. The results show that the method is better than the classic two-dimensional method. It can give a correct prediction of cable tensions, and provide a sound basis for construction control and checking.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第4期115-118,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(50708091)
关键词
预应力混凝土斜拉桥
悬臂浇注
仿真分析
实体退化单元
prestress concrete cable-stayed bridge
cantilever-casting
simulation analysis
degenerated solid element
