不同填土高度下箱涵内力变化规律的研究

Study on the law of internal force variation of box culvert with the increase of fill height

箱涵传统计算方法主要是通过建立平面杆系模型进行分析计算,这种分析方法不考虑箱涵的空间受力,对弯矩、剪力、轴力、扭矩等多种因素考虑较少。基于Abaqus有限元分析软件,对车辆荷载在土体中的扩散、土体之间的复杂受力以及箱涵和土体的接触进行模拟,分析在不同填土高度下箱涵的受力情况,并与平面杆系模型进行对比,结果表明:随着填土高度的增加箱涵的受力变化规律并不是严格的呈线形增长。

The traditional calculation method of box culvert is mainly through the establishment of plane bar system model for analysis and calculation.This analysis method does not take into account the spatial force of box culvert,but less consideration of bending moment,shear force,axial force,torque and other factors.Based on the Abaqus finite element analysis software,this paper simulates the diffusion of vehicle load in soil,the complex force between soil and the contact between box culvert and soil,analyzes the stress of box culvert at different fill height,and compares it with the plane bar system model.The results show that the variation of box culvert force with the increase of fill height is not strict.