![]() ![]() Buildings Main Wind Force Resisting System Components and Cladding 0.85 0.85 Arched Roofs 0.85 Chimneys, Tanks, and Similar Structures Square Hexagonal Round 0.90 0.95 0.95 Solid Freestanding Walls and Solid Freestanding and Attached Signs 0.85 Open Signs and Lattice Framework 0.85 Trussed Towers Triangular, square, rectangular All other cross sections 0.85 0.95.Directionality Factor K d has been calibrated with combinations of loads specified in. FIGURE 26.5-1C ( Continued) Wind Directionality Factor, K d Table 26.6-1 Structure Type Directionality Factor K d. ![]() Should there be one other load case where both the windward and leeward side have the positive C&C pressure applied? My thinking is that the positive pressure would only be ever applied to the windward side of the roof but I don't want to mistakenly eliminate a load case from my analysis.Wind speeds correspond to approximately a 15% probability of exceedance in 50 years (annual exceedance probability = 0.00333, MRI = 300 years). Based on this figure it would appear that the positive C&C pressure would only be considered on the windward side of the roof and not the leeward side (Load Case 2), whereas the negative pressure would be considered on both sides of the roof (Load Case 1). G10-5 the author states that two load cases are required to account for both wind directions (transverse and longitudinal). On page 127 of "Guide to the Wind Load Provisions of the ASCE 7-10 in Fig. The standard is not very clear how to take into account wind directionality with regards to the C&C loads. The C&C wind loads will be used to design the member loads of the truss. I will be designing a post frame type structure with site built trusses at 8 ft. 30.8-2 in the ASCE 7-10 I have both positive and negative pressures. As a follow up to this question I'm now looking at a open building with a 4:12 pitched roof (gable). ![]()
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