June 28, 2018
A Deeper Understanding of Deflection and Member Deflection Ratios
There are many different types deflection values calculated by RISA-3D. Let’s take a deeper dive into each.
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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There are many different types deflection values calculated by RISA-3D. Let’s take a deeper dive into each.
RISA-3D v16.0.4 introduces an enhancement that will allow for more control over the beam deflection ratio through Deflection Ratio Options. As part of the member properties, you can now designate the ends of single and multi-span beams as a cantilever or supported. This will determine whether the...
RISAFloor does not record the applied deck in a spreadsheet. To simplify modeling, it instead assumes a default deck is drawn within the entire diaphragm edge. If you have an area that will be a different deck or a different span direction, then you are free to draw in over the default. Whatever is...
RISA-3D now includes improved behavior of the automesh feature as well as the newly added global model setting for Plate Local Axis. The new plate local axis options include both Nodal and Global. These options allow for more control over plates which can lead to clearer results in plate contour...
Concrete pile design is now incorporated in the pile cap results in RISAFoundation. With the addition of axial pile design in RISAFoundation v10.0, the program can model concrete pile shapes and design the reinforcement, or the user can also apply their own custom rebar layout. Now you can get a...
RISA is pleased to announce the release of the latest RISA-Revit Link which is compatible with Revit 2020. The RISA-Revit Link v19.0 allows seamless integration between RISAFloor, RISA-3D, and Autodesk Revit. The latest version now includes the ability to import beam reinforcement details from...
RISA-3D v16 now includes the added ability to view foundations designed in RISAFoundation. This feature proves useful as it gives a way for engineers to see if foundations have been sized appropriately for the loading from RISA-3D. For more information about how foundations can be shown in RISA-3D,...
Update: July 2022 The issues with Windows 10 (Version 1803) have been solved. However, for customers still using older versions of RISA products, the workaround using compatibility mode described below may still be useful.
RISAFloor ES has the ability to check the Long Term Deflection with Creep and Shrinkage. The program uses an iterative method to adjust the plate stiffness until it converges upon a solution. You can setup all the necessary coefficients and factors in the Model Settings (as shown below).
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