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When calculating my model with a floor slab, I get very large shear forces displayed in that slab and also very large, unrealistic support forces displayed on the support ends, which makes the slab non-designable. What is the reason?
回答
The support forces are large because singularities occur at the ends of the line supports due to the rigid restraint.
It is possible to avoid this problem by a realistic modelling of the structural system. Floor slabs resting on walls are not really fully fixed in direction of the self-weight. With regard to the stiffness of the wall it is more realistic to model the support as a spring. The spring stiffness of a line support intended for a simulation of a wall is calculated by k = (E*d) / h, where E = modulus of elasticity of wall, d = thickness of wall, and h = height of wall.
By modeling line supports with springs you can avoid singularities as you can see in the picture showing the line support reactions.
Furthermore, modeling supports as springs is also useful for nodal supports. RFEM provides the "column" function for the nodal support generation where the spring parameter is automatically calculated and applied from the column geometry.
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“谢谢你们提供的实用信息。
我想向你们的技术支持团队表示感谢！给我印象深刻的是每次都快速、专业的解答我的问题。在建筑结构行业中，我使用了几个软件，包括服务合同，但是你们的技术支持是最好的。”
Dipl. Bauingenieur FH/SIA Markus Lauber
2016年11月28日
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结构设计与有限元分析软件（FEA）可以用于建立平面与空间结构模型，适用于由杆件、面、板、墙、折板、膜、壳、实体以及接触单元等的建模与分析计算。
