圆弧形大跨径波纹钢板桥涵的静力分析

摘要

以平面应变理论为基础,对一跨径为12 m的圆弧形波纹钢板桥涵建立三维有限元模型,施加土体自重和汽车荷载进行静力分析,得出了等效应力分布规律.并与国外两种计算方法进行对比分析计算结果的差异,同时说明了差异出现的原因.结果表明:结构在恒载和活载的共同作用下变形很小,满足中国的规范要求;最大等效应力位于拱肩处,最小等效应力位于拱脚处;ANSYS法计算的极限压应力与CHBDC法计算出的极限压应力非常接近,且均小于国外两种方法计算出的抗压强度.%Based on plane strain theory,a 3D finite element model for certain bridge culvert in corrugated sheet steel,which spans over 12 m,was established.With the dead weight of soil and vehicle load applied,the static analysis was carried out,and the distribution rule of the equivalent stress was concluded,then depending on the comparison with the results from the calculation methods at abroad,the reason why the difference arose was explained.The result shows that,the structure,under the action of dead load and live load,is subject to negligible deformation,meeting the requirements specified in Chinese standard;the maximum equivalent stress comes out at the spandrel and the minimum equivalent stress at the springing;the ultimate compressive stress calculated by ANSYS is close to that by CHBDC very much,and the both are less than the compressive strength calculated by the two methods at abroad.