考虑锚杆切向拉力作用的格构梁内力计算与数值模拟

为了研究喷锚支护体系中格构梁的计算理论及适用性,使用考虑开挖工况影响的ANSYS有限元模拟方法以及考虑锚杆轴力切向分量的Winkler方法,分析纵向格构梁内力,将两种方法分析结果进行比较研究,并与实测值对比,得出格构梁内力计算方法的适用性.在松软的地基上,最好采用Winkler法计算;在岩性地基上梁与地基的摩擦作用不可忽略,用考虑水平作用和轴向分力的Winkler法计算得到的结果最符合实际.ANSYS模拟的结果也可以比较真实地反映梁的受力情况,模拟梁的空间效果,具有较高的实用价值.

Internal force calculation and numerical simulation of lattice girders considering impact of tangential component of anchor rod axial force

In order to further study the calculation theory and applicability of the longitudinal lattice girder structure,this paper analyzes the internal force of the longitudinal lattice girder by means of the ANSYS finite element numerical simulation method considering the impact of excavation conditions of the deep foundation pit and the improved method of Winkler considering the impact of the tangential component of the anchor rod axial force.It compares the two calculation results and compares them with the actual measurements so as to obtain the applicability of the optimization calculation method of the internal force of the lattice girder.In the soft foundation,the best method is the Winkler;in the rock foundation,the friction between the beams and the foundation can not be neglected and the calculation results of the Winkler method considering the horizontal action and axial force components agree most with the actual measurements.The simulation results of ANSYS not only more truly reflect the force of vertical lattice beams and simulate the beam spatial effects,but also have high practical values.