February 3, 2018
What is the Difference Between Fixed and Reactions on Boundary…
In RISA-3D, you can define a boundary condition as Fixed (reaction will be calculated) or Fixed, (reaction will NOT be calculated).
Powerful Tools Don’t Help If They’re Left Unused Many engineers evaluate analysis software based on core modeling and design checks. But once a demo is over, some of the most impactful features are the ones that quietly save time on real projects — especially mid-size jobs where efficiency matters most. These aren’t advanced edge-case tools. They’re everyday features that often go underused. Diaphragm Forces: See Load Paths Instead of Guessing Diaphragm force output is one of the most valuable — and least leveraged — parts of a full building model. Instead of relying on manual distribution or conservative assumptions, engineers can directly see how loads are flowing to vertical elements. For mid-size structures, this clarity can mean: Fewer overdesigned collectors More confidence in lateral load paths Faster review and revisions when layouts change Batch Results: Review Smarter, Not Longer Batch results allow engineers to review multiple load cases, members, or design checks in a single pass. Instead of hunting through individual reports, patterns become obvious quickly. On mid-size jobs, this speeds up: QA/QC reviews Iterative design changes Comparing “before and after” scenarios It’s not about skipping checks — it’s about seeing the full picture sooner. Design Iteration Speed Is the…
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In RISA-3D, you can define a boundary condition as Fixed (reaction will be calculated) or Fixed, (reaction will NOT be calculated).
Column boundary conditions are set in RISAFloor per the Splice Type that you have set in the Columns spreadsheet. For any column at the lowest floor level, the Splice checkbox will automatically be checked, indicating that a boundary condition will be set at the base. You may set the boundary...
In RISA-3D, there are numerous options for Member End Releases which should not be confused with Boundary Conditions.
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