Minimum Reinforcement Reduction for Slow-Curing Concrete
In the case of using the slow‑curing concrete (usually for thick components), you can reduce the calculated minimum reinforcement by a factor of 0.85 to apply the load due to restraint, according to EN 1992‑1‑1, Section 7.3.2. However, a precondition for reduction is that the characteristic value of the strength development r = fcm2 / fcm28 does not exceed 0.3. Other key requirements for the application of this reinforcement reduction are specified explicitly in the final planning documents.
However, the reduction of the minimum reinforcement is regulated only in the national application documents for Germany and Austria. For other countries using Eurocode 2 for reinforced concrete design, this reinforcement reduction is not provided. Therefore, it is possible to apply the minimum reinforcement reduction in RF‑CONCRETE or CONCRETE only if you select one of the National Annexes for DIN EN 1992‑1‑1/NA: 2013‑04 (Germany) and ÖNORM B 1992‑1‑1:2011‑12 (Austria).
Dipl.-Ing. (FH) Alexander Meierhofer
Head of Product Engineering Concrete & Customer Support
Do you have questions or need advice?
Contact our free e-mail, chat, or forum support or find various suggested solutions and useful tips on our FAQ page.
The reinforced concrete design for fire situations is carried out according to the simplified method based on EN 1992-1-2, Clause 4.2. The "zone method" described in Annex B.2 is used.
Window '1.1 General Data' for Serviceability Limit State with Settings for Nonlinear Calculation According to 
- I obtain different results when comparing the deformation analysis in the RF‑CONCRETE add-on modules and another calculation program. What could be the reason for this?
- For the design, I can only select the surrounding reinforcement for a rectangular cross-section. Why?
- I have recently purchased RSTAB with the CONCRETE add-on module. Can I use it to perform the stability analysis of reinforced concrete columns?
- Why do RF‑CONCRETE Members or CONCRETE determine a significantly higher provided reinforcement than the required reinforcement?
- When calculating deformations in RF‑CONCRETE Members, I see inconsistencies in the deflection diagram. Why?
- Why can I no longer display the intermediate results in RF‑CONCRETE Members?
- Can I use RF‑CONCRETE Surfaces to determine the steel mass for the inserted reinforcement?
- In connection with the analytical SLS calculation, I get implausibly large values for the crack width and deformation in the RF‑CONCRETE add-on modules. What is the cause and how can I fix the problem?
- When opening an RFEM file, the entries in RF‑CONCRETE Surfaces are lost. Is it possible?
- Is it possible to adjust the initial values of the temperature courses entered for the fire resistance design? For example, I would like to adjust the initial value of the moisture content.
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
Design of reinforced concrete members and surfaces (plates, walls, planar structures, shells)
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions
Linear and nonlinear analysis of reinforced concrete members with reinforcement concept