When designing a plate, I get different reinforcements in different load situations with the same bending stress. Why?

Answer

For the design on a 3D model, you should pay attention to normal forces. The normal force can affect the loading of the respective direction, but can also affect the minimum lever arm.

In RF‑CONCRETE Surfaces, the smaller lever arm from both reinforcement directions is applied in 3D structures. In this context, the normal force in Direction 1 can have an impact on the required reinforcement in Direction 2.

Keywords

Lever arm Internal force Design 2D 3D Required reinforcement

Reference

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RFEM Main Program
RFEM 5.xx

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Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

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Design of reinforced concrete members and surfaces (plates, walls, planar structures, shells)

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