变高度连续钢桁架桥力学性能分析

Study on Mechanical Properties of Variable-height Continuous Steel Truss Bridge 146

摘要:

以空间曲面桁架桥为例，采用桥梁专业计算软件建立三维模型，分析空间异形桁架各杆件的力学性能和特点，并拟定杆件尺寸，验算桁架各构件强度、刚度；通过屈曲分析，验算全桥整体稳定性及构件稳定性，根据曲面桁架受力特点优化构件尺寸。对空间曲面桁架桥结构动力特性的分析表明，其振型表现为横向振动，可通过增加两榀曲面桁架间的横向联系来抵消由构件本身引起的弯矩。

Abstract:

Taking a spatial curved surface truss bridge as an example, the bridge professional calculation software is used to establish a three-dimensional model for analyzing the mechanical properties and characteristics of the spatial special-shaped truss members. And the member sizes are drawn up to check the strength and stiffness of each truss member. The overall stability and member stability of the whole bridge are checked by buckling analysis. The member sizes are optimized according to the stress characteristics of curved surface truss. The dynamic characteristics of structure are shown as the transverse vibration. By adding the lateral connection between two trusses, the bending moment caused by the member itself is offset.