斜拉桥钢-混结合段力学行为仿真分析

以山东省济宁市龙拱河特大桥为研究对象,首先借助专业软件Midas/Civil建立整体梁单元模型,以确定钢-混结合区域的内力数值;然后基于有限元软件ABAQUS,建立钢-混结合段的三维板壳实体模型进行精细化分析,明确该区段钢箱梁、混凝土横梁的应力场分布。研究表明:该桥主梁钢-混结合段的刚度过渡平顺,传力机制合理,安全储备良好,能够满足桥梁的受力需要,保证斜拉桥的结构安全。

Simulation Analysis on Mechanical Behavior of Steel-concrete Joint Section of Cable-stayed Bridge

The general finite element software ABAQUS is used to analyze the applicable conditions of the computational formula on the transverse tension of pier top in Article 8.4.7 of JTG3362-2018 for the rectangular pier. The results show that for the rectangular pier with small transverse width and bearing spacing, the standard computational formula has better accuracy, but for the rectangular wall pier with the transverse width larger than 10 m and the bearing spacing larger than 6 m, the accuracy of the standard computational formula is worse. The finite element computational method is recommended. Through calculation, the factors affecting the transverse tension of pier top are the pier transverse width b, bearing spacing s and bearing reaction Fd. In addition, the size of the transverse tension at the top of the rectangular pier cannot be ignored, and its reinforcement should be paid attention to.