提篮桁架系杆拱人行桥拱脚结构局部应力分析

Analysis on Local Stress of Arch Springing Structure of Basket Truss Bowstring Arch Footbridge

摘要:

拱脚处是桁架拱桥的关键节点，一般采用钢结构、钢混组合结构和混凝土结构等，其受力状态复杂，局部应力集中现象突出，依靠平面杆件计算软件难以模拟实际复杂的应力状态，通常采用有限元建模分析的方法进行计算。以一座提篮桁架系杆拱人行桥的拱脚钢结构作为研究焦点，借助空间有限元分析软件MIDAS Civil，成功构建了拱脚结构的三维精细化模型。通过对该三维模型进行深入细致的力学分析，得出了拱脚结构在受力状态下的具体数值。这些数值均符合相关设计规范的要求，验证了结构设计的合理性。

Abstract:

The arch springing is the key node of the truss arch bridge, and is usually made of steel structure, steel-concrete composite structure and concrete structure. Its stress state is complex, and the phenomenon of local stress concentration is prominent. It is difficult to simulate the actual complex stress state by using the plane member calculation software. Normally, the finite element modeling analysis method is used for calculation. Taking the steel structure of arch springing of a basket truss bowstring arch footbridge as the research focus, by the spatial finite element analysis software MIDAS Civil, the three-dimensional refined model of arch springing structure is successfully established. The in-depth and detailed mechanical analysis of the three-dimensional model is carried out to give the specific numerical values of the arch springing structure under the force-bearing state. These numerical values all meet the requirements of relevant design codes, and verify the rationality of the structural design.