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In a 3D model consisting of three identical floors, I applied a unit load of 1 kN/m² to the top slab to determine the spring stiffness of the supports for 2D modeling of the slabs from normal forces and deformations of the columns. Despite the deactivation of the self-weight of the structure, there is a redistribution of the column normal forces by storey. Is it possible to deactivate this effect?

Answer

This effect is most likely caused by the bending, torsional and shear stiffness of the slabs and can be avoided by modifying the stiffnesses mentioned.

To modify stiffnesses, go to the "Modify Stiffness" tab in the "Edit Surface" dialog box, see Figure.

Image 01 - Modify stiffness

Keywords

Story Axial force Deformation Spring stiffness Redistribution Effect

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  • Updated 16 November 2020

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