June 28, 2011
Checking Soil Bearing in RISAFoundation
RISAFoundation has the capability to report soil bearing pressures, and check them against allowable pressures.
June 16, 2011
How to Model a Hole in a Plate
While RISA-3D (or RISA-2D) does not have an explicit tool to punch a hole in a plate, you can use the following steps to manually model them:
June 13, 2011
How Do I Avoid Instability Warnings in a RISA-3D Model?
Have you ever received an instability warning when running a three dimensional RISA-3D model? This is because RISA-3D cannot build the stiffness matrix with the configuration you have modeled. In some cases, your model is truly unstable and in others it’s a matter of correctly modeling your...
June 3, 2011
How to Model Trusses in RISAFloor
In RISAFloor on the roof level, you layout only the top chords of the truss and create your slope. These top chords by themselves probably won’t be sufficient enough to get designed in RISAFloor, but, don’t worry, we’ll take care of that in RISA-3D when we model the rest of truss.
June 1, 2011
How to Assign a Wood Roof Member’s Unbraced Length in RISAFloor
In RISAFloor, the beams are susceptible to two forms of buckling; Euler buckling and lateral-torsional buckling. The unbraced length is determined in RISAFloor using the deck properties and framing.
May 26, 2011
How to Represent Trusses in RISAFloor Model Without Modeling the…
Using this method in RISAFloor, we are not actually designing the trusses, but just adding “dummy” bottom and top chords to correctly calculate the loading and help distribute the loads to the walls.
May 24, 2011
How to Apply a Tapered Load to Plates in RISA-3D
It’s easy to apply tapered surface loads to plates in RISA-3D by stepping up the loads from one level to the next.
May 23, 2011
How to Apply Notional Loads in RISA-3D
In RISA-3D you can automatically apply notional loads to your structure to comply with your steel code (such as AISC 360). Notional loads take into account a building’s actual out-of-plumbness by adding de-stabilizing lateral loads. The AISC 360 recommends either 0.2% or 0.3% of the vertical loads...
May 10, 2011
Are You Receiving Instability Warnings for Your Truss Model in…
When running a truss model in RISA-3D or RISA-2D, it’s quite common to receive an instability warning, but these can be easily resolved by following a few simple rules.