Question:
Is it possible in the RF‑CONCRETE Surfaces add-on module to limit crack widths due to internal restraint and with the customized f-ct,eff?
Answer:
To determine the minimum reinforcement due to restraint (drain of hydration heat) in RF‑CONCRETE, it is necessary to select at least one load case or CO for design in the "Serviceability Limit State" tab of Window 1.1 General Data. By default, the analytical method of the serviceability limit state design is activated in this tab. See Image 01.
After activating the serviceability limit state design, you can adjust the settings in Window 1.3 Surfaces. To do this, switch to the Limit of Crack Widths tab in Window 1.3. On the right side, you can find "Minimum Reinforcement for Effects Due to Restraint". By selecting the "Crack formation with certainty within the first 28 days" check box, it is possible to enter the factor for controlling fct,eff,As,min. See Image 02.