November 13, 2019

Applying Loading and Reviewing Results in RISA-3D

Tags: RISA-3D, Loads, v18, Properties, Results, New

April 20, 2011 | RISA-3D, Loads, New, Area Load

Refining Area Load Distribution in RISA-3D

After solving a model with Member Area Loads, RISA-3D will automatically create Transient Basic Load Cases that allow the user to verify load distribution. For information on how to view this distribution, please see the article "Using Transient Loads to Verify Applied Area Loads in RISA-3D". If this load attribution is not what you’d expect, you can adjust the Area Load Mesh entry, which controls the fineness of this distribution. This feature is located on the Solution tab of Model Settings: If you have a model with closely spaced members, you can lower this value to achieve a finer area load mesh and therefore a more accurate load distribution…

March 20, 2015 | RISA-3D, Loads, RISA-2D, New, News

Moving Load Point Load Generator now Available

A common question we get in tech support is “how can I verify my moving load results?” We now have a feature that will allow you to quickly generate a static loading condition equivalent to the moving loads at any given step along their path so you can investigate the detailed results at this location. First, you will want to run your moving load combination in an Envelope or Batch + Envelope solution to get your governing results. For further instruction with using moving loads, see “How to Use Moving Loads?”. Link: Moving Loads: How To Once solved, choose your results to review and open that spreadsheet. Notice that in the LC column, you will see both the governing load combination number and the governing moving load step number within that load combination. Choose which step number you want to investigate. On the Home tab of the Ribbon toolbar, click on the Create Point Loads from Moving Loads button. Enter which Basic Load Case you want the new point loads added to, the Moving Load pattern or load combination, and the Step Number then click Apply. You now have a static load pattern that is identical to the moving load…

April 18, 2011 | RISA-3D, Loads, New

Using Sum of Reactions in RISA-3D

RISA-3D will now check your model for errors by summing the reactions in your model and comparing them to the applied loads. This occurs for the global X, Y, and Z directions. If RISA identifies that the reactions do not equal the applied loads then the software will show a warning message to the user. There are three main reasons why this might happen: You have used a Fixed call out in the Boundary Conditions spreadsheet: There are instabilities in your model, causing locked joints: These locked joints may have an actual reaction coming out, but because the program was forced to lock it there is no calculation of this reaction. Fix the instabilities and the message will likely go away. Areas of high rigidity simulating boundary conditions (sometimes referred to as ghost reactions): If you have an area of your model that has a concentrated amount of very stiff elements and/or single elements that have very high stiffness, then these areas may approach the stiffness of a boundary condition and erroneously take load out of your model. Common reasons why this might happen: Setting the E and I values for your Material or Section Set overly high. A rule…