移动列车荷载作用下地铁换乘节点中板内力分析

设计地铁换乘站直接承受车辆荷载的楼板构件时，将地铁列车荷载按等效原则转化为静荷载作用在换乘节点上进行分析的方法已不能准确反映此种构件的受力情况．基于ANSYS子模型技术，采用双层数值分析模型，建立换乘车站结构梁一板一柱组合总体模型进行空间有限元分析，截取换乘节点中板局部区域，建立换乘节点中板一列车荷载子模型，采用ANSYS参数化设计语言APDI。完成移动列车荷载加载，获取移动列车过站过程中换乘节点中板的最不利荷载的位置及大小．结果表明，换乘节点范围接口位置的支座弯矩较大，柱位置有明显的应力集中现象；子模型获取的中板剪力和轴力极值均大于总体模型，设计时应综合考虑总体模型和子模型，确定中板内力的极值；子模型获取的中板内力极值发生位置及时刻各不相同．说明移动地铁列车荷载对中板内力的影响较明显．不应忽略．

Internal force analysis of medial plate in interchange joint of metro station under moving train load

IXtring the design of floor plate in interchange station which is straighdy subjected to train load, train load is always transformed into static load according to equivalent principle. It is difficult to reflect true stress of the part. Based on ANSYS subrmdeling technique, double-layer numeric analysis model is adopted. Firstly, a beam-plate-column combined racdel of the whole interchange station is established and analyzed. Then the medial plate is intercepted individually and a submcdel is created. By means of ANSYS Parametric design language, moving train load is applied on the medial plate. The disadvantage load positions and values of the medial plate under moving train load are obtained. It is found that bearing moments at the interfaces are large and the stress concentration emerged at the locations of columns; the extren-m of shear and axial force in subrr~lel am larger than those in total model, and the extrema of internal forces of medial plate should be de- termined under overall consideration between total model and submodel; the lccations and occasions of internal force extrmm am different in submodel, which shows that the influence of moving train load on internal forces of medial plate is obvious and should not be ignored. The results provide a theoretical basis for the structure de- sign of this kind of members.