It is important to understand how RISA is modeling your load distributions when applying flexible diaphragms. The flexible diaphragm distributes loads based on tributary area, but RISA breaks up the areas based on the nearest support elements on either side. When RISA sees support elements on both...
We are pleased to announce our latest RISA-3D release. Our teams have been working hard to add the features and functionality that our customers have requested as well fix some of the issues that have been reported. New features in this release include:
RISAFloor supports the three fundamental types of diaphragms used in structural analysis: rigid, semi-rigid and flexible. Watch this video to learn how to consider each of these diaphragm types within the same model and same floor plan.
The latest releases of RISAFloor (Version 15.0.1) and RISA-3D (Version 19.0.1) include consideration for accidental torsion and eccentric loading for semi-rigid diaphragms according to requirements outlined in ASCE 7, Section 12.8.4.2.
RISAFloor supports the use of flexible diaphragms on both flat and sloped roofs. Before reviewing the workflow for utilizing a flexible diaphragm on a sloped roof, it makes sense to review and understand the basic behavior of flexible diaphragms within RISAFloor. To do this, please first review the...
When modeling building structures using steel or composite steel floors, engineers typically utilize rigid diaphragms to distribute lateral loads (wind and seismic) to lateral load resisting elements such as shear walls, moment frames and braced frames. Rigid diaphragms represent a plane of very...
RISAFloor is the RISA Building System’s floor design software which allows users to design with composite decks, elevated concrete slabs and more. When paired with RISA-3D, the two create a complete solution for the analysis and design of multi-story structures, including two buildings on the same...
The ability to detach a wall panel from a diaphragm was a feature added in RISA-3D V13.
RISAFloor Concrete Floor Slabs can design be transferred into RISA-3D for lateral design using either a Rigid Diaphragm or Semi-Rigid diaphragm. In RISA-3D, the wind and seismic loads are calculated and then applied into the diaphragm level to distribute the forces to the Lateral Resisting System.
