![]() The material behavior of the concrete is determined as linear-elastic in the compression and tension zone until the concrete tensile strength is reached. If the tension stiffening at a section should be considered as well, a distribution coefficient (according to EN, Eq. ![]() Based on the internal forces determined at the serviceability limit state in RFEM, the program classifies the reinforced concrete cross-section as "cracked" or "non-cracked". The effective stiffness calculation of finite elements takes into account a reinforced concrete cross-section. These stiffnesses are used to determine the surface deformation by repeated FEM calculation. The deformation analysis according to the approximation method defined in standards (for example, deformation analysis according to EN, 7.4.3) applies to the calculation of "effective stiffnesses" in the finite elements in accordance with the existing limit state of the concrete with or without cracks.
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