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1- Fully Rigid diaphragm:
The rigidity of the slab; The system is accepted as a rigid diaphragm if the vertical bearing system elements designed to meet the effects of earthquakes are considerably larger than the stiffness. The difference between the center of mass and the center of rigidity causes twisting in the plan. According to Article 3.6.2.2 of TBDY , rigid diaphragm acceptance cannot be applied in buildings with A2and A3 type irregularities.
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In accordance with TBDY 2018 Articles 3.6.2.2 - 4.5.6.2 - 4.5.7.1 - /wiki/spaces/2IMEI/pages/11241720947.11.3, the in-plane and out-plane displacements of reinforced concrete slabs should be modeled with two-dimensional (shell, shell) finite elements to include degrees of freedom.
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