September 27, 2018
Using Analysis Offsets in RISA-3D
Have you ever wondered what the Analysis Offset feature does? Let’s take a look at how this feature can be used to model members at top of steel.
August 2, 2018
Governing Load Combinations for Shear in Concrete Columns
For concrete column members, the load combination producing the maximum shear code check is reported in the Detail Report and corresponding Results spreadsheet. Since concrete is evaluated based on a batch solution, this can be useful when shear governs the design.
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.
June 21, 2018
Beam Deflection Ratio Options
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...
September 11, 2017
Improved Drift Reporting
RISA-3D v15 now includes automatic drift definitions for diaphragms as well as simplified story drift application. The reported drift results have been updated as well, and are now much more relevant for today’s codes. Drift results will report results in red text when seismic drift exceeds the...
July 12, 2016
Camber Design Rules in RISAFloor
RISAFloor has the ability to assign camber design rules which allow the user more control over which members are cambered. A camber is the slight upward curvature of a steel beam which is used to compensate for deflection. A user can assign a camber directly to a member or set up design rules to...
December 9, 2015
Envelope Detail Report Results
RISA-3D v14 introduced envelope detail reports for all material members. This means that you can see the enveloped solution (force diagrams and governing code check values) in the detail report for each member when you solve either an Envelope or Batch + Envelope solution type.
September 16, 2015
How RISA-3D Calculates Member Deflection Ratios
After solving a model, you will see in the Member Deflections spreadsheet the following deflection ratios:
September 9, 2015
Why don’t the Beams in my Frame have axial force?
The beams in a lateral force resisting system, such as a braced frame or moment frame, typically carry a significant axial force. In the example below (with no diaphragms) the beam (M4) carries a significant axial tension.