Wind Direction and Hurricane-Induced Ultimate Wind Loads.
Wind Direction and Hurricane-Induced Ultimate Wind
Simiu, E.; Heckert, N. A.
European and African Conference on Wind Engineering (2
EACWE), 2nd. Proceedings. Volume 2. June 22-27, 1997,
Genova, Italy, Solari, G., Editor(s), 1825-1831 pp,
Journal of Wind Engineering and Industrial Aerodynamics,
Vol. 74, No. 76, 1037-1046, 1998.
wind direction; structural engineering
A consensus on the wind directionality issue is needed
for the validation by building officials of the
wind-tunnel procedure allowed by the ASCE 7-95 Standard,
and for the development of knowledge-based standard
provisions for wind loads. As a contribution to the
debate needed to achieve such a consensus we describe an
updated method for estimating wind loads that takes into
account the directional dependence of the aerodynamic
coefficients and the extreme wind climate, and uses the
'peaks over threshold' approach for the estimation of
extremes. For hurricane-prone regions, we estimate mean
recurrence intervals (MRIs) of ultimate wind loads
obtained from 50-yr loads via multiplication by a factor
specified by the ASCE 7-95 Standard. For typical
aerodynamic coefficients with strong directional
preference, depending upon location and building
orientation the estimated MRIs of the ultimate wind
loads varied betwwen less than 1,000 to more than 10,000
years. We also found that for loads with very large
MRIs the common practice of disregarding direction
effects is not necessarily conservative from a
structural engineering viewpoint.