大悬臂预应力混凝土盖梁计算分析

摘要

Issue on land saving to improve land utilization rate during the urban bridge construction, the great pre-stressed concrete cover beam always becomes the optimum scheme.Combined with prac-tical work,the design idea and method of great pre-stressed concrete cover beam are described in de-tail,the results of the calculation demonstrate that the connection location between pier column and cover beam is the design control section in most cases;and in order to ensure the structural safety of the construction process,the construction process of the cover beam should be accurately simulated and the tension sequence of pre-stressed tendons should be reasonably chosen.%城市桥梁建设中，为提高土地利用率，大悬臂预应力混凝土盖梁往往成为优选方案。结合某工程实例，介绍大悬臂预应力混凝土盖梁的设计思路和设计方法。计算结果表明，墩柱与盖梁连接处结构受力复杂，多为结构设计的控制性截面；结构计算时应准确模拟盖梁施工过程，合理选择预应力钢束张拉顺序和张拉时机，保证施工过程结构安全。