January 6, 2011
How to Model X-Bracing in RISA-3D
There are several tips to modeling X-Bracing within RISA-3D that can help the model solve faster and give you better results.
December 29, 2010
What is P-Delta Analysis?
When a model is loaded, it deflects. The deflections in the members of the model may induce secondary moments due to the fact that the ends of the member may no longer be vertical in the deflected position. These secondary effects for members can be accurately approximated through the use of...
December 21, 2010
How Can I Account For Continuous Tie Rods in RISA-3D Wood Walls?
Continuous tiedown systems are used to help resist overturning forces generated by lateral loads, and can be estimated in RISA-3D using the hold-down database and the strap forces.
December 16, 2010
How Should I Model Boundary Conditions for a Truss in RISA-3D?
When it comes to trusses in RISA-3D, boundary condition definitions (pin vs. roller) can make a huge difference. Let’s take an example of a typical roof truss. Note that a pin-pin boundary condition has been applied to the ends.
December 13, 2010
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:
November 29, 2010
How to Check Frame Story Shears in RISA-3D
When using rigid diaphragm analysis in RISA-3D it can be useful to evaluate the story shear in each frame. This is a perfect application for the Internal Force Summation Tool. The first step is to solve the desired load combination.
October 26, 2010
How to Use Spreadsheets More Effectively in RISA
RISA includes various advanced spreadsheet operations that make reviewing input and results easy.
September 20, 2010
Use RISA to Consider Bi-Directional (Quartering) Wind Loading
RISA-3D automatically considers the complex wind combinations required by ASCE 7 using the wind load generator and the load combination generator.
September 14, 2010
How to Design Flexible Diaphragms in RISAFloor
When you model your building in RISAFloor, make sure that you define your slab edge as flexible. That will ensure that the entire contents of the diaphragm will use flexible behavior.