Snow loadcases (ASCE7)

This section will look at the snow loadcases when the headcode is set to AISC.

The snow loadcases that are set up will depend on the head code that is being worked to.

Note:

All loads and lengths of loads are assumed to act on a horizontal projection of the roof surface.

Once set up these loadcases are standard loadcases so you can include them in combinations in the normal manner.

In the Snow wizard... you specify the Snow Loadcases to be set up from the following list:

Minimum Snow Load - for low sloped roofs
Balanced Snow load - uniform snow load and rain on snow load
Unbalanced Snow Load - the number of cases required being chosen to reflect the number of wind directions considered
Drift Snow Load
Rain on Snow Surcharge

Minimum snow load

Loads would need to be manually applied to this loadcase on completion of the Snow wizard... - the only snow load applicable being Uniform Snow.

Balanced snow load

This loadcase is automatically populated on completion of the Snow wizard...

Unbalanced snow load

Loads would need to be manually applied to these loadcases on completion of the Snow wizard... - both Uniform Snow and Valley Snow loads may be applicable, (depending on the model geometry).

Drift snow loads

Loads would need to be manually applied to these loadcases on completion of the Snow wizard... - the only snow load applicable being Local Drift Snow.

Rain on Snow Load Surcharge

This loadcase is automatically populated on completion of the Snow wizard...