What is the effect of the settings "Approach of pure tension restraint," "Approach of bending restraint," or "Depending on the defined load" for the determination of the minimum reinforcement As,min due to restraint?

Answer

The selection in the "Limit of Crack Widths" tab of Window "1.3 Surfaces" has a direct impact on the kc factor for the analytical calculation of the minimum reinforcement As,min for effects due to restraint according to Equation (7.1) of DIN EN 1992‑1‑1, 7.3.2.


If selecting the "pure tension restraint," the value kc = 1.0 applies in Equation (7.1). In the case of the approach of "bending Restraint," the add-on module sets the kc factor strictly to 0.4.

If you select "Depending on the defined load," the program interpolates the element of the kc value by the element depending on the stress distribution in the cross-section using the defined load.


This results in a constant distribution of the minimum reinforcement due to restraint being determined for the respective reinforcement direction of the surface when selecting "pure tension restraint" or "bending restraint." If you select "Depending on the defined load," there will be no constant distribution of the minimum reinforcement due to restraint.

The program behavior described above is the same in RF‑CONCRETE Members and RF‑CONCRETE Surfaces (in RFEM 5), and is also applied to the CONCRETE add-on module (in RSTAB 8).

Keywords

Restraint Minimum reinforcement Bending restraint Serviceability limit state Reinforcement SLS

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