陡坡傍山双层行车结构体系受力特性分析

以山区常见的40°陡坡地形条件下修建4车道高等级公路为例,提出一种环境和经济效益俱佳的新型"桩-锚-框架"复合双层行车结构体系,该体系具有双层行车、山体锚固、边坡支挡和路面支撑等众多功能。采用ABAQUS大型有限元分析软件对该双层行车结构体系进行三维数值模拟,探究其受力特性。研究结果表明:该结构体系具有良好的承载能力和静力稳定性,对陡坡山体有较强的支护作用;支撑柱和横梁的相交位置是整个结构体系应力较集中的部位,应适当增加该节点的配筋量以提高强度、改善节点受力情况。

Mechanical behavior of mountain-leaning double-deck highway structure

In the light of 4-way highway built along 40° steep slope, we propose a new composite highway structure composed of pillar, anchor and frame elements, which has both environmental and economic benefits. The presented system has functions of double deck vehicle transport, mountain slope anchorage, slope retaining and pavement support. Aiming at the new system, ABAQUS software is used to simulate the mechanical behavior of the structure. The results show that the system performs well in bearing capacity and static stability, exerting strong retaining effect on the steep slope; the intersection area of pillar and transverse beam is a stress concentrated area, so the nodes should be reinforced with more steel to improve the mechanical condition of the nodes.