预应力混凝土多箱桥腹板裂缝产生机理及影响研究

Research on Cause Mechanism and Influence of Web Cracks of Prestressed Concrete Multi-box Bridge

摘要:

以某座多箱室矮塔斜拉桥为依托，通过建立有限元实体模型对该桥典型悬浇节段进行施工模拟，分析在施工过程中腹板裂缝的主要发生机理，揭示腹板开裂主要是由混凝土水化热作用、腹板束张拉和混凝土收缩等因素叠加所导致的，并提出有针对性的预防措施和建议，为以后同类桥梁的设计、施工提供参考。

Abstract:

Relying on a multi-box low-pylon cable-stayed bridge, the construction of the typical cantilevered-poured segments of the bridge is simulated by the establishment of finite element solid model. The main cause mechanism of web cracks in the construction process is analyzed. It is revealed that the web cracks are mainly caused by the factor superposition of concrete hydration heat action, web bundle tensioning and concrete shrinkage. The targeted prevention measures and suggestions are put forward, which provides the reference for the design and construction of the similar bridges in the future.