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In building analysis, floors can be modeled in two different ways. The first of these is the Fully Rigid Diaphragm Adoption , where in-plane motion is neglected, assuming that the in-plane stiffness of the slabs is very high . The second is the Semi-Rigid Diaphragm Adoption , in which slab in-plane stresses and movement can occur, taking into account the stiffness of the slabs in the analysis model . It can be selected with the image shown below in the analysis settings.

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1- Fully Rigid diaphragm:

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Floor stiffness; It is an analytical model representing situations where the system is close to or equal to rigidity. Stiffness calculation is calculated depending on slab thickness, dimensions and material parameters. The semi-rigid diaphragm acceptance is the acceptance that reflects the most realistic behavior of the laying behavior in the structural analysis model. In the semi-rigid diaphragm model, floors are modeled with two dimensional finite elements (shells). Two dimensional finite elements create stresses on the shell element by their in-plane out-of-plane movement. According to this stress distribution, /wiki/spaces/2IMEI/pages/1123123680 reinforced concrete slab design can be made.

Analysis with semi-rigid diaphragm is based on the assumption that in-plane and out-of-plane deformation under the effect of earthquakes and the stresses resulting from these deformations are distributed over two-dimensional finite elements. Since the slabs are included in the analysis model, the stresses and strains can be seen in the analysis model. The analysis model of a building with the acceptance of Semi-Rigid Diaphragm is as shown below.

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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/1124172094, 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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