波纹钢腹板矮塔斜拉桥结构静动力分析

通过建立有限元模型对波纹钢腹板矮塔斜拉桥以及钢筋混凝土梁矮塔斜拉桥进行了静动力性能分析,对比了两者在移动荷载作用下主梁内力、主梁挠度、主塔内力、拉索内力以及结构自振特性的区别。研究结果表明:矮塔斜拉桥结构整体受力性能接近于连续梁;将钢筋混凝土梁替换成波纹钢腹板后,矮塔斜拉桥主梁刚度降低,主梁承担的荷载效应减少,此部分荷载效应通过拉索传递到主塔结构上,因此整体结构受力特点由主梁依赖型向主梁拉索协同型转变。

Static and Dynamic Analysis on Extradosed Cable-stayed Bridge Structure with Corrugated Steel Web

In this paper,the contrastive analysis on static and dynamic properties of the extradosed cable-stayed bridge with corrugated steel web and reinforced concrete web was made by establishing the finite element model,and the differences between the internal force of the main girder,the deflection of the main girder,the internal force of the main tower,the internal force of the cable and the natural vibration characteristics of the structure were mainly studied.The results show that the overall mechanical performance of the extradosed cable-stayed bridge is close to that of the continuous girder bridge.After the reinforced concrete web is replaced with corrugated steel webs,the stiffness of the main girder of extradosed cable-stayed bridge decreases,and the load effect of the main girder decreases.This part of the load effect is transferred to the main tower structure through the cable,so the stress characteristics of the overall structure change from the main girder dependent type to the main girder cable coordination type.