It is the assumed diaphragm to transfer horizontal forces to the structure without slab in-plane deformations.
With Rigid Diaphragm Behavior;
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Story masses can be defined at the center of mass of the slab.
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Since the number of unknowns is low, rapid analysis is performed.
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Beams do not receive axial force.
Preferred building types;
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Gapless slab structures without plan irregularities
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Structures in which story slabs safely transfer horizontal forces to the carrier system in their own planes.
The slab is considered to be in-plane infinitely rigid and does not change shape.
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When we compare the rigid diaphragm and semi-rigid diaphragm models, different displacement values are seen in the middle region of the models.
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The maximum displacement in the rigid diaphragm version is 0.035 millimeters.
You can review page 93 of the ideCAD Finite Elements Guide.
Diaphragm Modeling Selection
To model a rigid diaphragm, select the diaphragm modeling method from the Analysis Settings dialog.
Display of Horizontal Loads
Behavior of Structure Under Vertical Loads
