预应力混凝土连续箱梁桥开裂的三维仿真分析

3D Simulation Analysis on Cracking of Pre-stressed Concrete Continuous Box Girder Bridge

建立三维实体有限元仿真模型来分析某工程其中1联4×30 m四跨连续箱梁桥在施工过程出现裂缝的原因。在实桥分析前,三维仿真模型与空间梁单元模型进行比较,结果比较非常吻合,验证了三维仿真模型的正确性。在实桥分析中,考虑了具体的施工过程,对该桥结构在施工阶段的受力状态进行全面分析,对箱梁的开裂进行了相应的模拟,得到的计算结果合理地分析了箱梁开裂的原因。

The 3D solid finite element simulation model is established to analyze the crack cause in the construction process of a 1-couple 4×30 m span continuous girder bridge in a project. Before the analysis of bridge, the 3D simulation model is compared with the spatial girder element model. The comparison results are extremely matched, and validate the correctness of the 3D simulation model. In the analysis of bridge, the detail construction process is considered. The article completely analyzes the stress status of the bridge structure in the construction stage, relatively simulates the cracks of box girder. The calculation result reasonably analyzes the cracking causes of box girder.