What is the effect of the setting 'Approach of Pure Tension Restraint', 'Approach of Bending Restraint' or 'Depending on Defined Load' when determining the minimum reinforcement As,min from restraint?

Answer

The selection in the '1.3 Surfaces' input dialog box within the 'Limitation of Crack Widths' tab has a direct influence on the kc factor for the analytical calculation of the minimum reinforcement As,min for absorbing effects due to restraint according to Equation (7.1), DIN EN 1992-1- 1, 7.3.2.


If 'Centrical Restraint' is selected, a kc value = 1.0 is applied in equation (7.1). When applying 'Bending Restraint', the module sets the kc factor strictly to 0.4.

If ‘Depending on Defined Load’ is selected, the program interpolates the kc value element by element depending on the stress distribution in the cross-section using the defined load.


This results in a constant distribution of the minimum reinforcement from restraint being determined for the respective reinforcement direction of the surface when ‘Centrical Restraint’ or ‘Bending restraint’ is selected. If you select 'Depending on Defined Load', no constant distribution of the minimum reinforcement is resulting from restraint.

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

Keywords

Restraint forces Minimum reinforcement Bending restraint Serviceability limit state Reinforcement SLS

Downloads

Links

Contact us

Contact Dlubal Software

Did you find your question?
If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

(267) 702-2815

info-us@dlubal.com

RFEM Main Program
RFEM 5.xx

Main Program

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

Price of First License
3,540.00 USD
RFEM Concrete Structures
RF-CONCRETE 5.xx

Add-on Module

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

Price of First License
810.00 USD
RFEM Concrete Structures
RF-CONCRETE NL 5.xx

Add-on Module

Physical and geometrical nonlinear calculation of beam and plate structures consisting of reinforced concrete

Price of First License
1,300.00 USD
RFEM Concrete Structures
RF-CONCRETE Deflect 5.xx

Add-on Module

Analytical deformation analysis of plate structures consisting of reinforced concrete

Price of First License
400.00 USD