By Joseph A. Demkin
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5, ASCE FIGS. -1a, b, c) The basic wind speed is determined, for any geographical location, as a function of risk category. For Risk Category II , V is taken from ASCE Fig. 0014 ∼ = 700-yr mean recurrence interval2 (MRI). 6 speciﬁed in earlier versions of the Standard for strength design. 0. For Risk Categories III and IV, V is taken from ASCE Fig. 5-1B; the probability of exceedance is 3% in an average 50-yr period, that is, the MRI is approximately 1,700 years. 0. ) For Risk Category I , V is taken from ASCE Fig.
06. 6na /V z for = h, B . 4na /V z for = L. 4Q)2 gR2 R 2 ⎟ ⎠ For wind parallel to short horizontal dimension of building, B = 125 ft, L = 60 ft. 98. 06. 85. Step 4. Note: Topographic factor and velocity pressure coefﬁcient Kz are evaluated at the same heights. 1). See Table in Step 5. • Topographic factor Kzt (ASCE Sect. 8; Sect. 5). 0. 1. Step 5. Velocity pressures q (ASCE Sect. 2, Eq. 3-1). 6 (all heights; based on Kz at z = h = 95 ft) Step 6. Internal pressures (ASCE Sect. 1, item A, col. 2).
At any one point in time, the difference between the ﬂuctuating velocities at two distinct points in space increases as the distance between those points increases. This spatial variation is referred to as imperfect spatial coherence. ) Consider the peak external aerodynamic pressure ppk (P ) measured at a point P on the surface of the structure, and an area A of that surface surrounding point P . If A is very small, it can be assumed approximately that the peak aerodynamic force acting on A is equal to ppk (P )A.
Environmental resource guide by Joseph A. Demkin