

2D reinforcement design (N, M_{y}) is implemented in application by ČSN 73 1201. Application allows to design two rows of reinforcement (A_{s1}, A_{s2}) to crosssection composed from n rectanular concrete parts (e.g. rectange, T crosssection, Icrosssection, ...) as well as uniform reinforcement to circular crosssection (column). Methodology by [1] was used for derivation, where one rectangle was replaced to n rectangles. Influence of one rectangle on two equation system was replaced to sumation formulas for n rectangles. Design is optimized on speed for pure bending (plates, continuous beams). Interaction diagram is used for crosssection appraisal, it is applicated for m reinforcement rows. If the reinforcement designed by methodology described thereinbefore is unfit, the reinforcement is designed in second round by incrementing A_{s1}, A_{s2} and appraised by interaction diagram (design by interaction diagram appraisal). Inputs describtion:
Interaction diagram is output besides minimal reinforcement areas:
[1] Ballo  Havránek  Holub  Pirháč: Betónové konštrukcie, 1. časť, SvF STU Bratislava, 1993. 
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