锚杆格构系统格构梁内力计算方法分析

锚杆格构梁在滑坡、塌岸等地质灾害治理工程中被广泛使用.由于十字交叉的格构梁内力计算比较复杂,工程中常常简化为单根格构梁进行内力计算.为了研究单根格构梁的计算结果和十字交叉格构梁计算结果的差异,采用FLAC3D软件,分别计算交叉格构梁和单个格构梁的弯矩,并进行比较分析.结果表明,将锚杆拉力分配到纵梁和横梁上,然后分别计算单根纵梁或横梁,计算结果偏小20%左右,不能满足工程要求;当纵梁刚度远大于横梁时,可假定纵梁承受所有锚杆拉力,并简化为单根格构进行计算.

Analysis of Calculation Methods for Internal Force of Lattice Beam

Anchor lattice is widely used in geological hazard controlling engineering.Grillage beams are usually reduced to combination of single lattice beam in the practical engineering because that it is a bit complicated to calculate its internal force.By means of calculating the internal force in the single lattice beam method and the grillage beam method,the fast Lagranian analysis of continua in three dimensions（FLAC3D） is used to study the difference between this two methods.The results show that if the tension in the anchor bolt is distributed in longeron and crossbeam,and the calculation is based on single longeron or single crossbeam,the calculation result will be smaller by 20%.That is to say that the result in this way can＇t meet the engineering requirement.The study also indicates that all the anchor bolt tenxion could be assumed to be taken by longeron if the longeron stiffness is much greater than that of the crossbeam;and then the calculation can simplified to single beam meathod.