## 2010 Archive

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.

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December 23, 2010

### How Do I Design My Model For the Envelope of Flexible and Rigid Diaphragms?

In RISAFloor, the deck edge (also known as Slab Edge) is selected as Rigid or Flexible. In a building that needs to be designed for both, start with Flexible.

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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.

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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. Letâ€™s take an example of a typical roof truss.

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December 13, 2010

### How to Use the Internal Force Summation Tool in RISA-3D to Design Reinforcement

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.