涵洞建筑结构移动载荷优化设计仿真

Design and Simulation of the Moving Load of Culvert Building Structure

对涵洞建筑结构移动载荷的优化能够有效预防道路和堤坝工程中涵洞建筑存在的难点问题。在优化建筑结构时需要计算出压力集中系数,得到涵洞填土高度和顶部压力值的变化关系。传统方法主要通过计算涵洞顶部在移动载荷下的附加土压力实现移动载荷优化,但是无法得到填土高度和顶部压力值的变化关系,导致优化效果不理想。提出基于有限元分析的移动载荷下涵洞垂直土压力极限分析方法,首先结合土压力理论,从涵顶平面内外土柱沉降差综合参数入手,将增加的模型填土高度重量视为载荷,然后通过分析垂直土压力极限分析法,给出填土高度小于等沉面高度时涵顶土柱与四周土体的相互剪切力,得到涵洞填土高度和涵洞顶部垂直土压力值的变化关系,计算出涵洞顶部垂直土压力的上限解。仿真结果表明,所提方法对涵洞建筑结构移动载荷的优化效果较好。

An ultimate analysis method for vertical soil pressure of culvert under moving load is proposed based on the finite element analysis. Firstly, the method starts with the comprehensive parameters of differential settlement be- tween internal and external earth-pillar in the top culvert plane, and uses the increasing model filling height weight as the load. Then, it gives out the mutual shear force between culvert top earth-pillar and all around soil body during the filling height is less than the equal settlement plane height. Moreover, it obtains the changing relationship of cul- vert filling height and vertical soil pressure value of culvert top. Finally, it works out the upper-bound solution of top vertieal soil pressure. The simulation results show that the method has good optimization effect.