In concrete elements;
Column and beam elements are modeled with rod finite elements, considering all 6 degrees of freedom at the nodal points. Shearwalls and slabs are modeled with shell finite elements (shell) containing degrees of freedom for both in-plane and out-of-plane displacements. At the nodes of shell finite elements, all 6 degrees of freedom are taken into account.
The flexible diaphragm model is the analytical model that represents the situation where slab stiffness is taken into account. The stiffness calculation is calculated depending on the slab thickness, dimensions and material parameters. The flexible diaphragm acceptance is the one that reflects the most realistic behavior of the slab behavior in the structure analysis model. In the flexible diaphragm model, slabs are modeled with Local Axes of Shell Elements. Local axes of shell elements can move in-plane out-of-plane and create stresses on the shell element. Concrete slab design can be made according to this stress distribution .
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The relationship between the numbers and colors of the local axes in the beam elements is as follows.
1 direction - Red
2 direction - Green
3 direction - Blue
There are 6 degrees of freedom in a cross-section of a bar element for which three-dimensional analysis is performed. These are translations in directions 1,2 and 3 and rotations about 1,2 and 3.
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The analysis results of a structure with slabs and shearwalls modeled with shell finite elements can be seen as follows.
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For detailed information; Local Axes of Shell Elements
Beam and Shell Finite Element Connections
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As the finite element widths are reduced, the linked link elements will also increase.
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