斜拉桥钢拱塔在不同荷载作用下受力分析

以钢拱塔斜拉桥为例,采用有限元软件,对成桥阶段恒载、汽车荷载以及横向风荷载作用下的钢拱塔的弯矩及剪力进行了分析,得到以下结论:恒载作用下,顺桥方向上钢拱塔最大弯矩发生在离桥面大约1/3钢拱塔高度处,横桥方向上钢拱塔最大弯矩发生在钢拱塔底部,最大剪应力发生在离桥面大约2/3钢拱塔高度处;汽车荷载下,顺桥方向上钢拱塔弯矩最大弯矩发生在钢拱塔底部处,最大剪应力发生在离桥面大约1/5钢拱塔高度处;横向风荷载下,顺桥向上钢拱塔最大弯矩发生在钢拱塔底部处,最大剪应力发生在钢拱塔底部处,最大值为637kN·m,且钢拱塔顶部的剪力方向与钢拱塔底部相反,最大值为243kN·m。

Stress Analysis of Steel Arch Tower of Cable-stayed Bridge Under Different Loads

Taking the steel arch tower cable-stayed bridge as an example,the finite element software is used to analyze the bending moment and shear force of the steel arch tower under the dead load,vehicle load and lateral wind load in the bridge stage,and the following conclusions are obtained:dead load Under the action,the maximum bending moment of the steel arch tower in the direction of the bridge occurs at the height of about 1/3 of the steel arch tower from the bridge deck.The maximum bending moment of the steel arch tower in the direction of the transverse bridge occurs at the bottom of the steel arch tower,and the maximum shear stress occurs at About 2/3 of the steel arch tower height from the bridge deck;under the vehicle load,the maximum bending moment of the steel arch tower in the direction of the bridge occurs at the bottom of the steel arch tower,and the maximum shear stress occurs about 1/5 steel from the bridge deck.At the height of the arch tower;under the lateral wind load,the maximum bending moment of the upward steel arch tower occurs at the bottom of the steel arch tower,and the maximum shear stress occurs at the bottom of the steel arch tower,the maximum value is 637 kN·m,and the top of the steel arch tower The direction of the shear force is opposite to the bottom of the steel arch tower,with a maximum value of 243 kN·m.