Introduction

The Capacity - response is based on the calculation of strain and stress in particular component (concrete fibre, reinforcement bar) and comparison with limited values with respect of EN 1992-1-1 requirements. Based on the internal forces, concrete cross-section and defined reinforcement by the user, SCIA Engineer is able to calculate the response of a member or a single cross-section. This method uses an iteration routine to calculate equilibrium based on the internal forces, the cross-section, material properties and reinforcement layout. However, this method does not calculate extremes (capacities of cross-section) like the interaction diagram, but calculates the state of equilibrium for that section (response). The calculation also includes depth of compression zones (d), curvatures in each axis (ε_x, ε_y and ε_z), stresses, strains and forces in particular components. Generally, this iterative method works for the interaction of the normal force (N) with uni-axial or bi-axial bending moments (M_y + M_z).