奉化江大桥结构稳定性有限元分析

Analysis on the Structural Stability of Fenghuajiang Bridge Using Finite Element Method

鉴于奉化江大桥复杂的空间结构形式,应用通用有限元程序Marc和杆系单元建立有限元模型,分析其在各种荷载条件下的强度、刚度和稳定性,确定各结构单元的材料性质、截面几何性质、边界条件等因素,然后计算其在各荷载工况下的位移和失稳形态.结果表明:该桥的刚度和稳定性满足安全要求.

The Fenghuajiang River Bridge is a three-crossing arched bridge with continuous bottom-road constructed with concrete filled steel tubes, and its system load-capacity belongs to the category of composite structure of beam and arch. Due to the complexity of the spatial structural form, a finite element method is used to analyze the strength and stability under the given loads. As an object of the bridge, the general finite element program Marc is used to simulate the practical components including the material properties, sectional properties, load conditions, the boundary conditions, etc. These elements are input to the computational model as entries and then the stiffness and stability of bridge are checked after analyzing the displacement and buckling model.