Can I get displayed a precast slab or an element slab with different layout of reinforcements in RF-CONCRETE Surfaces, e.g. a reinforcement layer in the precast element and the other reinforcement layer in the cast-in-place concrete extension?

Answer

When considering only the ultimate limit state, it is possible to define a different concrete cover per Reinforcement direction in RF-CONCRETE Surfaces (see Figure 01). Provided the serviceability limit state is also designed, the two reinforcement directions must be adjacent to each other. A different concrete cover per reinforcement direction can not be considered anymore.

Consideration of 3D Design - Shell
When designing objects in a 3D structure, the element is considered as a shell. Here could act some moments and axial forces which are transformed into design membrane forces. By means of these design membrane forces, the required reinforcement is determined. In connection with the transformation from moments and axial forces, the smaller lever arm from both reinforcement directions is applied. Thus, only one governing lever arm is assumed for both directions.

Consideration 2D Design - Slab
When designing results in a 2D structure, the surface element is considered as a slab. Only the moments are effective, which are designed with the associated lever arm of the direction. Thus, each direction is supposed to have its respective lever arm.

Keywords

Concrete cover Lever arm Element slab Precast slab Precast part Cast-in-place concrete extension

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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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RFEM Concrete Structures
RF-CONCRETE 5.xx

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

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