February 15, 2011
What is the Difference Between a Boundary Condition and an End…
In RISA-3D, there are numerous options for Member End Releases which should not be confused with Boundary Conditions.
December 13, 2010
Rebar Design using the Internal Force Summation Tool in RISA-3D
When you have a plate model for a slab or wall in RISA-3D, the Internal Force Summation Tool (IFST) is a very useful analysis tool to get exactly the forces that you want to design for. To use the tool, you must:
October 26, 2010
How to Use Spreadsheets More Effectively in RISA
RISA includes various advanced spreadsheet operations that make reviewing input and results easy.
June 14, 2010
How Do Plates Connect to Each Other?
To best understand how plates interact with each other you must first understand the concept of Physical Members. The important thing to keep in mind is that plates are not physical members. A plate is defined using either three or four joints, and it only connects to other plates at those joints....
May 24, 2010
Define a Beam Eccentricity in RISA-3D
When you have a deep column, it is necessary to model the beam so that it connects to the face of the column. This results in an eccentricity at the joint. RISA-3D offers two ways to model this eccentricity.
May 12, 2010
Let’s Customize Your RISA Toolbar
The customizable toolbar is a new feature in RISAFloor. It’s really useful and you may have overlooked it. You’ll find all of your familiar buttons as well some new buttons which make reviewing your model and results easier.
April 20, 2010
How to Correctly Define Unbraced Lengths
There are four different values for Unbraced lengths in RISA-3D, RISA-2D and RISAFloor. Two are for axial calculations and two are for bending calculations.
March 26, 2010
What Are Physical Members?
Members (beams, columns, braces, etc.) are defined in RISA by an I-Node and a J-Node. While you and I see a beam occupying physical space between two columns, most programs see a line between Point I and Point J. This is known as a non-physical member. See the image below:
March 19, 2010
How to Model a Two-Dimensional Component in RISA-3D
If you have ever tried to solve a two-dimensional model in RISA-3D, you have ultimately run into instabilities in your model because your model has no out of plane restraint.