一种预应力混凝土异型箱梁结构分析

Structural Analysis of a Special-shaped Prestressed Concrete Box Girder

在城市快速路设计中,城市立交节点根据交通功能需求经常设置多个定向匝道桥。因受到主线桥梁和地面辅助道路设计的限制,以及城市地下管线的影响,匝道桥结构设计中桥梁上部预应力混凝土箱梁结构必须采用外伸大跨度悬臂的中横梁构造,形成了一种特殊的结构类型。针对实际工程中这种特殊结构的受力特点,采用有限元分析方法,重点对典型工况进行了整体结构和局部数值分析,对整联桥梁进行了动力性能分析,较完整地得出了此类结构的力学状态,对工程项目设计和施工提供有力的技术支持,对同类结构应用具有一定的参考价值。

In the design of urban expressway,the multi-directional ramp bridge is often constructed at the node of urban interchange according to the traffic functional requirements.Due to the design constraint of mainline bridge and ground auxiliary roads,and the influence of urban underground pipelines,it is necessary to adopt the middle crossbeam structure with overhanging large-span cantilever for the superstructure pre-stressed concrete box beam of the bridge in the structural design of ramp bridge in order to form a special structure.Aiming at the mechanical characteristics of this special structure in the practical project,the finite element analysis method is used to carry out the overall structure and local numerical analysis for the typical construction conditions.The dynamic performance of integrated bridge is analyzed.The mechanical state of this structure is more completely obtained.The powerful technical support is provided for the design and construction of the engineering projects,and some references are valuable for the application of the same structures.