February 20, 2024

Added Ability to Move Nodes with Mouse in RISA-3D

Introducing RISA-3D v22.0, the latest milestone in structural engineering innovation! One of the standout features of this release is the ability to move nodes with a simple mouse gesture in the 3D graphical view. This intuitive functionality revolutionizes your design process, allowing for seamless adjustments and precise control over your structural model. Say goodbye to tedious manual input and hello to effortless manipulation of nodes. Experience the power of RISA-3D v22.0 and take your structural designs to new heights!

RISA-3D

Tags: RISA-3D, New

March 17, 2010 | RISA-3D, New, Instability

Do You Ever Get the “LOCKED” Message on a Simple Beam Model?

Do you get an instabilities warning when you’re trying to do a simple 2D model in RISA-3D? Below is the easiest way to test and fix the instability: Open the Node Reactions spreadsheet, and see which joint is unstable. In the Boundary Conditions spreadsheet, apply a Reaction to the joint in the degree of freedom that was LOCKED. Re-run the model and examine the Node Reactions. If the reaction that is restraining the instability is showing a ZERO force or moment, then the instability is inconsequential to the results. Also, if the reaction that is restraining the instability is showing a non-zero force or moment, then you have a problem with the model that must be corrected for you to get valid results…

March 19, 2010 | RISA-3D, RISA-2D, New, Instability

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. To quickly lock your model out of plane, RISA-3D offers the ALL command in the Boundary Conditions spreadsheet. Type All in the Node Label cell and Reaction in the Z direction cell. This will restrain all nodes in your model from any translation in the Z direction. This command will add a boundary condition to every joint for the translation or rotation that you specify. You will not see these boundary conditions graphically, but solving will show the instabilities are gone…

October 25, 2024 | RISA-3D, RISAFoundation

Tips for Solving a Slow Solution in RISA-3D

Is your RISA-3D software solution running slower than you expected? There are a few things you can do during your model set up in order to make your model more efficient and reduce the solution time. RISA has compiled a list of our most common tips for solving a slow solution in RISA-3D. 1. Is your Analysis Mesh too Small? RISA software uses a finite element analysis mesh to analyze and solve the structural model. Therefore, RISA-3D creates software generated plates when submeshing elements (such as diaphragms and walls). By default, the FEA mesh size is set to 24 inches. RISA users have the ability to reduce the mesh size. However, reducing the FEA mesh size causes the program to generate a much finer mesh which takes a longer time to solve. If your model solution is very slow, we suggest reviewing these FEA mesh size settings. You may need to increase this mesh size. This mesh setting is found in your Model Settings, then open the Solution tab. Please Note: Increasing mesh size can help improve run time, but can also reduce results accuracy, so modify with a balanced approach. What about Semi-Rigid Diaphragms? In an integrated RISAFloor/RISA-3D model,…