Coastal and Floodplain Construction Inspector's Practice Exam

Given a 54' width structure built in a 90 mph wind zone with a dead load of 15 psf, what is the uplift for trusses with 12" spacing?

1. 300

2. 400

3. 500

4. 450

The correct answer is: 400

To determine the uplift for trusses in a structure built within a 90 mph wind zone, several factors need to be considered, including the width of the structure, the dead load, and the spacing of the trusses. For a 54-foot wide structure operating in a 90 mph wind zone, it is essential to assess the impact of the wind load on the trusses when calculating the uplift. The uplift is calculated using the formula which typically involves the area of the roof affected by wind loads, the wind pressure, and the spacing of the trusses. In this case, with trusses spaced at 12 inches, it becomes necessary to find the effective area each truss supports, and then multiply this by the applicable wind pressure derived from the wind speed (90 mph). The uplift force can be specifically calculated looking at the wind load on that span, taking into account the dead load, which influences total load calculations. Given the dead load of 15 psf, and the size of the building, the wind pressure for the 90 mph wind zone can be derived using appropriate load combinations outlined in relevant building codes. By applying these computations, the total uplift load generated at the truss spacing results in the specific answer. Therefore,