A Deeper Understanding of Deflection and Member Deflection Ratios
There are many different types deflection values calculated by RISA-3D....
Structural engineering isn’t just about calculations—it’s about making assumptions explicit, validating them against the built environment, and translating loads into actionable design decisions. Even perfect analysis won’t prevent problems if coordination fails. Here are four real-world cases that illustrate the challenges and solutions that practicing engineers face daily. Architect Coordination – “The Wall Section That Didn’t Exist” Project: Multi-story mixed-use building Challenge: The architectural drawings specified a wall section that was shallower than required for structural framing. Technical Issue: The structural model indicated that full lateral loads required a thicker wall cavity to properly anchor the framing. If built per the architectural drawings, the wall would have created clearance issues and compromised the lateral load path. Solution & Workflow: Compared architectural sections to the structural model in 3D. Highlighted discrepancies in the model and prepared annotated visuals. Shared a clear summary with the architect outlining why the wall depth needed adjustment. Outcome: The architect revised the wall section prior to construction. No field conflicts occurred, and the project stayed on schedule. Engineering Lesson: Always validate architectural assumptions against your structural model. Small dimensional mismatches can create drift, clearance, or lateral capacity problems. Contractor Coordination – “The Footing That Wasn’t There”…
Read More
There are many different types deflection values calculated by RISA-3D....
RISA-3D v16.0.4 introduces an enhancement that will allow for more control...
RISA-3D v15 now includes automatic drift definitions for diaphragms as...
RISAFloor has the ability to assign camber design rules which allow the...
RISA-3D v14 introduced envelope detail reports for all material members....
After solving a model, you will see in the Member Deflections spreadsheet...
The beams in a lateral force resisting system, such as a braced frame or...
A rigid link is a member element in RISA-3D that can be used for many...
When solving a RISA-3D model with hot rolled steel members under the AISC...
Our monthly "Structural Moment" newsletter is the best way to keep up with RISA’s product updates, new releases, new features, training events, webinars and more...