June 3, 2022

Match Properties in RISA-3D

RISA-3D now includes the ability to "match properties" between members. For more information about this feature, check out the video below:

Tags: RISA-3D, Properties, New, Members

June 1, 2021 | RISA-3D, New, Unbraced Length

Understanding Unbraced Length in RISA-3D

In this video, learn about the various unbraced length parameters that exist in RISA-3D and how the different values can impact the design of beam and column members in RISA-3D. Click the button below, for more detailed information about unbraced length in RISA-3D…

December 13, 2010 | RISA-3D, Plates, Loads, RISA-2D

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: Be looking at the model in a plan or elevation view (i.e. 2D View only). Have selected ONLY the portion of the model that you want to sum the forces for (all other elements are Un-selected). Let’s look at a slab example. Here we have an elevated slab that is supported on all edges, with a column that lands in the center of the slab. The slab is modeled with plate elements. After we solve the model for that load, we can view our plate contours and use the selection tools to select a representative strip. The representative strip would be a strip through our slab/wall that we want to get the forces for so we can then design reinforcement for this strip. To use the IFST, select the button on the left side of the screen. Clicking twice on our strip will create a plane that the program cuts through the model and will then display the…

January 17, 2019 | RISAFloor, Diaphragms, New

RISAFloor & RISA-3D: Two Buildings on the Same Podium

RISAFloor is the RISA Building System’s floor design software which allows users to design with composite decks, elevated concrete slabs and more. When paired with RISA-3D, the two create a complete solution for the analysis and design of multi-story structures, including two buildings on the same podium. Equivalent Lateral Force/Static Force Procedure After the definition of slab edges and the application of diaphragms in RISAFloor, RISA-3D is used to determine the different lateral forces that need to be attributed to each individual diaphragm that exists at each elevation. These story forces can then be displayed graphically (as shown below) per diaphragm at each elevation. Dynamic Analysis If your building requires a dynamic analysis, mode shapes can be calculated and displayed in the same fashion as they are for a single structure. Similarly, building frequencies and mass participation’s are just as simple to retrieve by simply choosing “frequencies” or “mode shapes” from the Results Toolbar or the Results menu drop-down. Intermixing Diaphragm Types RISA also allows users to analyze with different diaphragm types (flexible, semi-rigid, rigid) at the same elevation of your separate buildings. Using RISAFloor paired with RISA-3D, engineers can analyze and design complex structures with this configuration. In addition,…