As an engineer you have been asked to design a support for a exhaust stacks duct which has a diameter of 40" and has a height of 72" above a roof. The center of stack is about 25 feet above the ground level. The wind in the area could get up to 130 miles per hour during hurricane season. ACSE (American society of civil engineering) suggest that the Force acting F = 0.00022 xVxArea. Where V wind velocity in MPH. And area in ft It is desired to use " diameter of thru bolts with average tensile strength of 14 kpsi and maximum allowable tension force of 1130 lbf. And maximum shear force of 1963 lbf to be used at 8" circumference spaces. 1. Calculate the number of bolts needed. 2. Safety factors based on upload bending moment (lift force) 3. Safety factor based on shear force. 6'-0" Min.