1609.6.3 Design wind load cases.
BC § 1609.6.3
The main windforce-resisting system of buildings, whose wind loads have been determined pursuant to Section 1609.6.1, shall be designed for wind load cases as defined below: Case 1. Full design wind pressure acting on the projected area perpendicular to each principal axis of the structure, considered separately along each principal axis. Case 2. Seventy-five percent of the design wind pressure acting on the projected area perpendicular to each principal axis of the structure to be applied eccentric to the center of the exposure with eccentricity equal to 15 percent of the exposure width, considered separately for each principal direction. Case 3. Wind loading as defined in Case 1 for each orthogonal direction, but considered to act simultaneously at 75 percent of the specified value.
