November 17, 2011

How Do I Assign Drift Snow Loads to the Roof in RISAFloor?

RISAFloor has the ability to apply tapered snow loads on your building’s roof to simulate drift snow loads.

Go to the roof framing level in your model and select Draw Area Loads from the Drawing toolbar. This will open the Create Area Loads dialogue box.

Select the Tapered Area Loads option and enter in your Base and Peak Magnitude values for your load. Select SL (Snow Load) as the load category and select PY as the Direction.

There are three options for Direction; PY, y and Y. Y represents the global Y direction, y represents the local y direction of the members and PY is the projected load in the global Y direction. See "Using Projected Loads in RISA-3D" for more information on how projected loads are applied.

Using Projected Loads in RISA-3D

Tapered area load dialog

Click Apply and select the four points that will make up the perimeter of your snow load. Note that the first two points you select will be the base of the tapered load and the last two points will be the peak.

These tapered area loads can be drawn as any four sided polygon and are not required to be rectangular or square. To view your area load in an isometric view select the ISO button from the Windows toolbar.


Tags: Loads RISAFloor

You may also be interested in

Nov 8, 2018 | Tips & Tricks
Mat Slab Overturning and Sliding Safety Factors

RISAFoundation v11.0 includes two new tabs in the Safety Factors resul...
Read More

Aug 21, 2019 | Tips & Tricks
RISA-3D v18 Sneak Peek Videos

The new release of RISA-3D is right around the corner! Check out our t...
Read More

Jul 12, 2019 | Tips & Tricks
Implementing Realistic Behavior for T/C Members in RISA-3D

Tension or Compression (T/C) Only members are commonly used in steel b...
Read More

Jun 20, 2019 | Tips & Tricks
Understanding Wall Panel Forces with Rigid Diaphragms

Rigid diaphragms represent a plane of very high rigidity and distribut...
Read More