August 27, 2020
VIDEO: Creating Custom Shapes in RISA-3D
Learn how to build custom steel and concrete shapes using RISASection and then import them into RISA-3D to incorporate them in analysis and design.
When the Graphs Don’t Match: Understanding the Controlling Case A common question from users is why the maximum moment shown in the Detail Report graphs doesn’t match the required flexural moment reported in the design results. At first glance, this difference can be confusing — but it comes down to how RISA determines the controlling condition for design. Each member design is based on the governing load combination and the controlling location along the member where the combined effects of bending and axial forces produce the highest demand-to-capacity ratio (DCR). The graphs, on the other hand, show the pure bending moment diagram, which does not include these combined effects. To fully understand the calculation behind the flexural demand (and shear), expand the Applied Loading section of the Detail Report. There you’ll see how RISA combines: Bending + Axial forces for flexural checks Shear + Torsion forces for shear checks By reviewing both the governing load combination (Gov LC) and the location of the controlling results within the expanded sections, you can pinpoint exactly where and why your member design is governed by interaction effects rather than just the maximum moment value from the diagram. When Torsion is Involved: Considering Warping…
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Learn how to build custom steel and concrete shapes using RISASection and then import them into RISA-3D to incorporate them in analysis and design.
When using RISA Integration between RISASection and RISA-3D, RISA-2D and/or RISAFloor, there are a few common mistakes that people make when attempting to access the RISASection files from the Shape Database.
There are multiple options in RISA-3D and RISAFloor to create a custom shape not available in the program databases. The first, is to utilize RISASection in order to create cross-sections, calculate section properties and import the shape directly into RISA-3D. For more information on integrating...
Use RISASection to find the properties of built-up steel sections, then model beams using the same section properties in RISA-3D and get full code-checks using AISC 360. This webinar will teach you how to use RISASection quickly and easily to determine complex section properties.
RISASection v2 includes updated torsional shape properties for a more accurate analysis. Check out the video below for more information:
In order to get code calculations, RISA-3D and RISA-2D need to know what type of shape would be most similar to yours. This is because the program needs to use the correct code equations for your shape type.
RISASection 2.0 includes the ability to assign your section as one of the predefined hot rolled steel Shape Types (Wide Flange, Channel, Tube, etc.). This means that when the shape is imported into RISA-3D, you will now be able to get design results and code checks for the member.
The latest version of RISASection, includes a powerful new DXF import feature. This feature allows the user to import any 2D geometry into RISASection for the calculation of the cross-sectional properties and the import into RISA-2D, RISA-3D or RISAFloor for use in the larger model.
Modeling built-up or composite sections can easily be done in RISASection. Because the properties of such a section are computed using a weighted summation of the transformed shape properties, RISASection uses a Property Multiplier to specify the relative weight of a single shape in a built up...
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