In concrete elements;
Column and beam elements are modeled with beam finite elements, considering all 6 degrees of freedom at the nodal points. Shearwalls 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. Since the in-plane stresses of the slabs are assumed to be zero in the rigid diaphragm analysis model, the slabs are not modeled as a shell finite element.
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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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For detailed information; Local Axes of Shell Elements
Beam and Shell Finite Element Connections
In the analysis model established for the rigid diaphragm solution, the columns are included in the analysis system with the rigidities of the dimensions they are defined. When the analysis model of the beams connected with the slabs is established, the section with the table is accepted. In the analysis model shown as a solid-body system in the picture below, it can be observed that the beams are included in the analysis model by calculating the appropriate table dimensions.
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The analysis model is created automatically by connecting the curtains and beams with the appropriate link elements.
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While constructing the analysis model of the shear beam connection, the bar finite element representing the beam element and the acceptance finite element representing the shearwalls are connected to more than one node to represent the actual behavior between the beam and the shearwall. In the picture below, the joint points connected by the link element in the analysis model of the beam-shearwall connection are shown by marking them in red.
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Green Link Elements
It connects concrete columns and beams along their long axis. The length of the link element is automatically defined in accordance with the column-beam layout, taking into account the column dimensions and misalignment in the column-beam junction area.
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In the green link element defined on the concrete beam axis, half of the link length in the continuation of the beam has the same stiffness values as the beam, and the remaining half of the length has very high bending and shear stiffness. In the section with high stiffness, the moment in the 3 direction and the shear stiffness in the 2 direction have high values relative to the local axis of the beam. In case of misalignment, stiffnesses in all directions are defined as high (infinite) value. The picture below illustrates this situation. The length L is defined as the length of the link element.
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