锚杆格构梁节点荷载分配研究与优化设计

锚杆格构梁节点荷载分配在工程中常采用均分或利用Winkler弹性地基模型的无限长梁模式推导分配系数,但均不符合实际受力情况。因此,本文利用双参数弹性地基模型推导出有限长梁受集中力的内力解答。根据此解答再计算出节点荷载分配系数kT和kL,进而得到格构梁的内力。结合实际工程,把理论解与ABAQUS有限元软件模拟所得数值结果进行比较,验证了理论解答的正确性,并与Winkler地基模型解答相比较,证明双参数地基模型较Winkler地基模型有更好的精确性,该方法可优化锚杆格构梁设计。

Study on nodal load allocation of anchor rod-lattice beam and its optimization design

During the actual construction,the average allocation or the allocation coefficient deduced by the infinitely long beam pattern of Winkler elastic foundation model are often adopted for the nodal load allocation of the anchor rod-lattice beam,but both of them do not accord with the relevant actual stress state. Therefore,the two-parameter elastic foundation model is utilized herein to deduce the solution of the internal force under the concentrated force on the finite-length beam. Based on this solution,the nodal load allocation coefficients kT and kL are calculated,and the internal force of the lattice beam is then obtained. Combined with an actual project,the theoretical solution is compared with the numerical result from the simulation made by the finite element software—ABAQUS,thus the correctness of the theoretical solution is verified and compared with the solution from the Winkler foundation model. It is demonstrated that the two-parameter elastic foundation model has a better accuracy than that of the Winkler foundation model,and then the design of the lattice beam can be optimized with this method as well.