公路两用混合-组合梁斜拉桥结构体系分析

Structural system analysis of cable-stayed bridge with hybrid-composite girder of two traffic function highway cable-stayed bridge

依托有限元分析方法,对超宽公路两用混合-组合梁斜拉桥结构体系进行基本力学性能分析。通过对全漂浮体系与半漂浮体系方案的力学对比,研究两种结构体系在静力性能上的差异;通过调整混合段结合面的位置,研究分析主梁挠度、应力及主塔弯矩的变化情况;研究不同混凝土主梁刚度对结构力学性能的影响,从而优化混凝土主梁截面设计。

Based on the finite element analysis method,this paper analyzes the basic mechanical properties of the cable-stayed bridge structure system of super-wide highway dual-purpose hybrid-composite beam,and studies the difference of static performance between the two structural systems by comparing the mechanical properties of the full floating system and the semi-floating system.By adjusting the position of the joint surface of the mixing section,the changes of deflection,stress and bending moment of the main tower are studied and analyzed.This paper presents the influence of different stiffness of concrete main girder on structural mechanical properties,and provides basis for optimizing the design of concrete main girder section.