What does NC mean in Risa?
If ‘NC’ is listed, that means the ‘n’ value is greater than 10000 which is a very small deflection. The minimum value that will be shown is ‘1’. For example, if the deflection criteria is L/360, check here to make sure no tabulated values are less than 360.
Is tension positive or negative Risa?
As for the sign convention, the signs of these results correspond to the signs of the forces. These line up as positive or negative according to the member local axis directions. Compression is positive and tension is negative.
What is Risa connection?
RISAConnection is a useful program designed to assist engineers in finishing steel structures by creating welds and connections between the elements. You can use the program to inspect the design in a 3D view and to modify the dimensions in the 2D panel.
How do you show deflection in Risa?
Displaying the deflection graphically will help you visualize how the model is behaving and will often times bring to light modeling errors. Turn on the deflected shape by clicking on the Result View Settings button on the Home tab. Or by clicking on the Deflection button found on the View Toolbar.
What is UC Max in Risa?
The Max UC entry gives the maximum code check due to axial force plus in-plane bending . The Shear UC will show the in plane shear code check. A value greater 1.0 for any of these values would indicate failure. The LC columns report the load combination that produces each of the highest code check values.
What is unity check in Risa?
Unity Check (UC) Results The governing code equation that resulted in this value is displayed in the far right column for reference as well. The Shear UC represents a similar ratio based on the shear provisions of the design code. All input and results are shown in the member local coordinate system used by RISA.
How do you use Risa connection?
Just follow these steps in the RISA-3D model:
- Define the Member Types in your RISA-3D model.
- Define the Connection rules.
- Assign the Connection rules to the beams.
- Run the RISA-3D model and use the Director button to send the connections to RISAConnection.
How do I install Risa connection?
- Step 1: Download your installer below.
- Step 2: Save the file to a location you can access (such as your desktop).
- Step 3: Double-click on the saved file to start the installation.
- Step 4: Go to your Licenses page and click the License Details button for further instructions.
How do you show deflected shape in Risa 2d?
The deflected shape is really helpful to understanding your model’s behavior. You can view the deflected shape of your model in RISAFloor. Just change the view to the Isometric view and click on the Deflected Shape Icon.
What is AP delta analysis?
P-Delta Analysis is a Non-linear second-order analysis which exhibits a considerable increase in the base moment when a structure is subjected to large lateral displacement due to wind or seismic forces.
What does the Risa -3D member length value of 100 mean?
If this value were set to 100, this would mean that for a member that is 100ft long, RISA -3D will calculate these values at approximately every foot. These values are then used in the member steel, wood, and concrete code checks, the diagrams in the model view, and in the detail reports.
How do I change the number of internal sections in Risa?
The Number of Internal Sections can be adjusted in the Model Settings Dialog. If this value were set to 100, this would mean that for a member that is 100ft long, RISA -3D will calculate these values at approximately every foot.
How do I use the Drawing toolbar in Risa?
If there is not a model view already open then click on the RISA Toolbar to open a new view and click to turn on the Drawing Toolbar if it is not already displayed. If you are not drawing between existing joints, you will need to create a drawing grid or define joints on the Joint Coordinates spreadsheet.
How does risa-2d work with polygons?
Once a polygon is drawn, RISA-2D will create a submesh of quadrilateral plate elements, limited by the edges of the polygon, and of a size corresponding to the plate edge minimum indicated by the user. Note that only quadrilateral plate elements are created with the AutoMesh tool.