Coastal and Floodplain Construction Inspector's Practice Exam

Given a 34' width structure built in a 110 mph wind zone with a dead load of 20 psf, what is the uplift for trusses with 16" spacing?

1. 600

2. 550

3. 400

4. 700

The correct answer is: 550

To determine the uplift for trusses in high wind zones, you need to calculate the wind uplift force acting on the structure. In this case, you have a 34' wide structure located in a 110 mph wind zone, with certain loads defined. First, the area affected by wind can be calculated using the width of the structure. The basic formula for wind uplift is: \[ Uplift = Wind Pressure \times Area \] Wind pressure can be derived from the wind speed using the formula: \[ Wind Pressure (psf) = 0.00256 \times (V^2) \] Where \( V \) is the wind speed in miles per hour. Plugging in the wind speed of 110 mph: \[ Wind Pressure = 0.00256 \times (110^2) = 0.00256 \times 12100 = 30.976 \, psf \] Next, since the trusses are spaced at 16 inches, you need to determine how many trusses there are over the width of the structure: - Convert the width to inches: 34' = 34 x 12 = 408 inches. - Determine the number of trusses: \( 408 \,