In my last post, I discussed the modeling requirements for semirigid diaphragms. When modeling with a semirigid diaphragm, it is necessary to indicate the appropriate in-plane properties, including thickness, modulus of elasticity, and Poisson’s ratio; identify the extents of the diaphragm boundaries including significant slab openings; and mesh the diaphragm into a set of plate elements for the finite element analysis.
Coarse Mesh vs Fine Mesh Sizes
The question arises on the appropriate mesh size to use. What is the impact on the results if a coarse mesh is used versus a fine mesh?
The structure shown here was analyzed in Bentley Systems’ RAM Structural System. This example structure was selected because of the asymmetry of the frames and the narrow diaphragms through the center of the floor plan.