User Guide

Tutorial 3 - Loading
Version 5.0 79
appropriate members. RISA-3D provides 1-way and 2-way area loads. 1-way
loads are attributed to the closest member in a certain direction and 2-way loads
are attributed to the closest member regardless of direction.
The roof load will be a 20psf vertical load attributed to the truss top chords with a
1-way area load. The wind load will be a 40psf lateral load attributed to the
members on the side of the structure with a 2-way area load.
We will select the roof plane to make the drawing instructions clear. Unselect the
entire model by clicking on . Now click the Criteria Selection button.
Select the Coordinates tab and click the Clear Selection Criteria button. In the
first Y coordinate field enter “26.75” for the minimum value.
The maximum value is not necessary since there is nothing above that elevation.
The dialog should look like this: