双层桥面预应力混凝土连续梁桥结构受力分析

Mechanical Analysis of a Prestressed Concrete Continuous Girder Bridge with Double Deck

为研究双层预应力混凝土连续梁桥结构受力及动力特性,结合工程实例,建立桥梁空间有限元模型,分析短暂状态和持久状态下结构的应力分布规律及承载能力,采用子空间迭代法分析成桥结构动力特性。结果表明:短暂状态下,压应力集中在中跨支座处;持久状况下,此类桥型支座处主梁抗剪承载力应为设计关注的重点。主梁模态以竖弯振动为主。

In order to study stress states and dynamic characteristics of a prestressed concrete continuous girder bridge with double deck,the bridge space finite element model was established with the engineering example,and the stress distribution law and the bearing capacity of the structure under transient state and permanent state were analyzed.Under the finished bridge state,the structural mode was investigated with subspace iteration method.The results show that under transient state,the stress is concentrated in the middle span support,and in the long term,safety reserve of shear bearing capacity of the main beam should be observed.The main mode of the girder is the vertical bending vibration.