July 14, 2011
Varying Soil Properties in RISAFoundation
While RISAFoundation has a Default soil properties (Subgrade Modulus and Allowable Bearing), it is possible to create regions of varying soil properties.
July 5, 2011
How to Model Composite Sections in RISASection
Modeling built-up or composite sections can easily be done in RISASection. Because the properties of such a section are computed using a weighted summation of the transformed shape properties, RISASection uses a Property Multiplier to specify the relative weight of a single shape in a built up...
June 30, 2011
How to Model a Void in a RISASection Shape
In order to model built-up or composite sections, RISASection includes the Property Multiplier, an input value which specifies the relative weight of the shape’s modulus of elasticity to that of the overall section. This value can also be used to model a void or a hole in the shape.
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.