49

1 Design wind pressures above represent the following: Roof—Net pressure (sum of external and internal pressures) applied normal to all roof surfaces.

Wall—combined net pressure (sum of windward and leeward, external and internal pressures) applied normal to all windward wall surfaces. 2Values shown are for exposure B. For other exposures, multiply values shown by the factor below:

1 Design wind pressures above represent the following: Roof—Net pressure (sum of external and internal pressures) applied normal to all roof surfaces.

Wall—combined net pressure (sum of windward and leeward, external and internal pressures) applied normal to all windward wall surfaces. 2Values shown are for exposure B. For other exposures, multiply values shown by the factor below:

Exposure Factor

3 Values shown for roof are based on a tributary area less than or equal to 100 sf. For larger tributary areas, multiply values shown by reduction factor below:

Area Reduction Factor (Linear inter-(SF) polation permitted)

4 Values shown are for importance factor I = 1.0. for other values of I, multiply values showed by I.

5 Plus and minus signs indicate pressures acting toward and away from exterior surface, respectively.

Source: From Minimum Design Loads for Buildings and Other Structures, (ASCE 7-95), American Society of Civil Engineers, Reston, Va., with permission.

or buffeting in the wake of upwind obstructions should be considered in design. Wind-tunnel tests on a model of the structure and its neighborhood may be helpful in supplying design data. (See also Sec. 9.)

("Minimum Design Loads for Buildings and Other Structures," ASCE 7-95; and K. C. Mehta et al., Guide to the Use of the Wind Load Provisions, American Society of Civil Engineers.)

TABLE 6.11 Design Wind Pressure—Method 1 Components and Cladding—Enclosed Building

DESIGN WIND PRESSURE (PSF) Effective Basic wind speed V (mph)

area

Location Zone (SF) 85 90 100 110 120 130 140 150 160 170

10 +5 -13 +6 -15 +7 -18 +9 -22 +11 -26 +12 -30 +14 -35 +16 -40 +19 -46 +21 -52 1 20 +5 -13 +6 -14 +7 -18 +8 -21 +10 -25 +12 -30 +13 -34 +15 -39 +18 -45 +20 -51

100 +4 -12 +5 -13 +6 -16 +7 -20 +8 -24 +10 -28 +11 -32 +13 -37 +15 -42 +17 -48

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Renewable Energy 101

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