New
FAQ 002585 EN-US 03/06/2019

Paul Kieloch Design CONCRETE RSTAB 2D RSTAB RFEM 2D RFEM RF-CONCRETE NL RF-CONCRETE

Why do I need the add-on module RF-CONCRETE NL for the proof of stability in RF-CONCRETE Members?
In EC2, paragraph 5.8.6 only speaks of geometric nonlinearity.

Answer

For the proof of stability of compression members you need the combination of RF-CONCRETE Members and RF-CONCRETE NL.

First, the internal forces of the individual LCs (Th. II order + Imp). For this you basically only need RFEM.

Thereafter, the cross-sectional detection in RF-CONCRETE Members is carried out with these linear-elastic determined internal forces, and a required bending reinforcement is determined from these internal forces.

This bending reinforcement is then compared with the inputs specified by the user with regard to the existing basic reinforcement or minimum reinforcement and from this a reinforcement proposal (module dialog "3.1 Existing longitudinal reinforcement") is generated.

This existing longitudinal reinforcement is then used for the non-linear design.
According to Section 5.8.6 (1), geometric nonlinearities must be taken into account according to second-order theory. However, the general rules for non-linear methods according to 5.7 also apply.
In paragraph 5.7 (1) "non-linearities of the building materials must be adequately taken into account". According to 5.7 (4) P, non-linear methods must use material properties which lead to a realistic rigidity and which take into account the uncertainties of failure.

The add-on module RF-CONCRETE NL is necessary for this. Accordingly, the geometric and material nonlinearities are taken into account and the requirements of EC2 with regard to the verification in the ultimate limit state are fulfilled.

The same procedure is also available in RSTAB in the add-on module CONCRETE.


Keywords

CONCRETE NL bars pressure general method nonlinearities

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