地铁车站结构内力计算中的问题

介绍工程建设中对温克弹性地基梁用有限元计算时的两种处理方法：一是用离散的弹簧代替分布的地基，据此推导相应的刚度矩阵;二是在计算模型中不需另加弹簧，用温克地基梁理论直接推导出梁单元刚度矩阵.通过算例，将计算结果与对应的解析解进行对比，分析单元数目、单元划分式对两种不同处理方法的影响及地基抗力系数对弯矩计算结果的影响。

Problems in Internal Force Calculation of Metro Station Structure

Two FEM methods dealing with the problem of elastic foundation beam ha engineering construction are introduced. The first method employs the discrete springs to replace the distributing foundation to derive the corresponding stiffness matrix; the second method directly derives the stiffness matrix of beam element based on the Winker foundation theory without adding the springs. Comparisons between the calculation results of these two methods with corresponding analytic solutions are performed by the calcuhtion examples, and the effects of the element number and element division mode on these two methods are discussed. In addition, the influence of the foundation resistance coefficient on the calculation result of the bending moment is analyzed.