SIMPLIFIED WIND LOADS

Subpart 1. Section 2200. A. This section applies to the wind loads for the main wind force-resisting systems only. B. In order to utilize wind loads from this part, the building shall meet the following requirements: (1) 60 feet or less in height; (2) height not to exceed least horizontal dimension; (3) enclosed building; (4) roof shape - flat, gabled, or hip; (5) roof slope of 45 degrees maximum; (6) simple diaphragm building; (7) not a flexible building; (8) regular shape and approximately symmetrical; (9) no expansion joints or separations; and (10) no unusual response characteristics (for example: vortex shedding, galloping, or buffeting). Subp. 2. Simplified design wind pressures. P s represents the net pressures (sum of internal and external) to be applied to the horizontal and vertical projections of building surfaces. For the horizontal pressures, P s is the combination of the windward and leeward net pressures. P s may be determined from the following equation: P s = K zt (V ult 2 /115 2 )P alt where: K zt = Topographic factor as defined in Chapter 26 of ASCE 7. P alt = Alternative simplified design wind pressure from Table P alt . TABLE P alt a Horizontal and Vertical Pressure b Exp B | 25 psf Exp C | 30 psf Exp D | 35 psf Overhang Vertical Pressure c Exp B | -40 psf Exp C | -48 psf Exp D | -56 psf a Values are for ultimate wind design (V ult ) . Multiply by 0.6 for allowable stress design (ASD). b For vertical pressure, the above values are negative (upward). c Negative values are upward. Statutory Authority: MS s 16B.59 ; 16B.61 ; 16B.64 ; 326B.02 ; 326B.101 ; 326B.106 ; 326B.13 History: 32 SR 10; L 2007 c 140 art 4 s 61; art 13 s 4; 39 SR 91; 44 SR 537