Minnesota Administrative Rules

1303.2200 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_ult²/115²)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 Palt a
Horizontal and Vertical Pressureb
	Exp B	25 psf
	Exp C	30 psf
	Exp D	35 psf

Overhang Vertical Pressurec
	Exp B	-40 psf
	Exp C	-48 psf
	Exp D	-56 psf

^aValues are for ultimate wind design (V_ult). Multiply by 0.6 for allowable stress design (ASD).

^bFor vertical pressure, the above values are negative (upward).

^cNegative 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

Published Electronically:

November 13, 2019