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Use the MWFRS Envelope Procedure in ASCE 7-10 Chapter 28, Part 1 to answer this question. Assume that the building meets the conditions described therein. You have been tasked with designing an open building. The mean roof height is 20 ft, and the roof angle is 20 degrees. The basic wind speed provided by the local building authority is 135 mph. Assume that exposure category D is applicable and that the building is not located on a hill or an escarpment. Determine the MWFRS design wind pressure, p, on Zone 4 for Load Case A. Disregard the minimum pressure of 16 psf described in section 28.4.4.

What is the load duration factor, CD, for a load duration of ten minutes?

Girders G1, G2 and G3 in the roof framing plan support loads from purlin P1. Use ASD to determine the maximum bending moment in girder G3. The roof dead load is D = 12 psf.    The reduced roof live load for this girder is Lr = 14 psf.

What is the size factor, CF, for the bending strength of No. 1 visually graded dimension lumber, except Southern Pine, that is 12 in. wide and 2 in. thick?

Determine the tension parallel to grain reference design value for 2 in. wide No. 1 Dense visually graded Southern Pine dimension lumber.

What is the load duration factor, CD, for a load duration of two months?

Girders G1, G2 and G3 in the roof framing plan support loads from purlin P1. Use ASD to determine the maximum bending moment in girder G2. The roof dead load is D = 15 psf.    The reduced roof live load for this girder is Lr = 19 psf.

What is the wet service factor, CM, for the shear strength of visually graded Southern Pine dimension lumber?

Use the MWFRS Envelope Procedure in ASCE 7-10 Chapter 28, Part 1 to answer this question. Assume that the building meets the conditions described therein. You have been tasked with designing an enclosed building. The mean roof height is 15 ft, and the roof angle is 5 degrees. The basic wind speed provided by the local building authority is 115 mph. Assume that exposure category C is applicable and that the building is not located on a hill or an escarpment. Determine the external pressure coefficient GCpf on Zone 3E for Load Case A.

What is the flat use factor, Cfu, for visually graded dimension lumber, except Southern Pine, that is 6 in. wide and 4 in. thick?