组合结构有限元计算存在的问题和处理方法

梁、板、壳等结构单元在有限元计算中使用十分广泛，但由于其几何特点，在组合结构有限元计算中，如果不正确处理，有时会给计算结果带来一定的影响。针对组合结构分析中，应力集中及几何位置简化等导致较大计算误差的情况，以地铁车站结构中常见的板梁组合结构为分析对象，从工程实用角度出发提出了相应的对策和处理方法。采用这些措施，可以在使用现有通用有限元软件进行计算的情况下，获得较符合实际的结果

Problems in calculating composite structure with FEM and their countermeasures

Structural elements such as beam, plate and shell, are widely used in the finite element analysis. However, the geometric characteristics of structural elements may lead calculation errors in some cases. For example, when analyzing composite structures with structural elements, some problems such as stress concentration and improper simplification of the geometric position will induce rather large calculation errors. Taking the slab and girder composite structure in subway station as the analyzing object, the corresponding countermeasures are put forward for the purpose of engineering practicality. By using these measures, reasonable result can be obtained with general-purpose FEM software.