July 19, 2011
How to export a model to DXF
RISAFloor, RISA-3D, and RISAFoundation all allow the user to export a model as a DXF file for use in most major CAD programs.
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.
April 6, 2011
What are the Unbalanced Forces on Beams?
V-Brace frames in RISA-3D seismic design have unbalanced forces shown on both the beams and braces. As brace frames displace under lateral loads, one brace will buckle and its force decreases while the other brace in tension will have an increase of force until it reaches yield.
February 1, 2011
What is a “Default Deck” in RISAFloor?
To understand decks it is important to know what a deck is. In typical buildings, most of each floor will consist of only one type of deck.
October 26, 2010
How to Use Spreadsheets More Effectively in RISA
RISA includes various advanced spreadsheet operations that make reviewing input and results easy.
September 14, 2010
How to Design Flexible Diaphragms in RISAFloor
When you model your building in RISAFloor, make sure that you define your slab edge as flexible. That will ensure that the entire contents of the diaphragm will use flexible behavior.
September 14, 2010
How to Model a Building on a Hill
When dealing with a sloping site, it is often necessary to step-down the bases of columns and walls along the length of a building. The example below illustrates how to model this in RISAFloor.