ON MODELLING OF TYPHOON-INDUCED NON-STATIONARY WIND SPEED FOR TALL BUILDINGS

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ON MODELLING OF TYPHOON-INDUCED NON-STATIONARY WIND SPEED FOR TALL BUILDINGS

Author: J. CHEN AND Y. L. XU | Size: 1.74 MB | Format: PDF | Quality: Unspecified | Publisher: J. CHEN AND Y. L. XU | Year: 2004 | pages: 19

Typhoon-induced wind around tall buildings may not be stationary because it is a large body of rotating air. A
new approach is thus proposed in this paper for characterizing typhoon-induced wind speed. Typhoon-induced
non-stationary wind speed is modelled as a deterministic time-varying mean wind speed component plus a zero
mean stationary fluctuating wind speed component. The time-varying mean wind speed is naturally extracted
from the measured wind speed time history using empirical mode decomposition (EMD). Wind characteristics
described in the traditional approach based on a stationary wind model are redefined and extended in the nonstationary
wind model. The new approach is then applied to wind data measured at the Di Wang building during
Typhoon York. The results show that most of recorded wind samples are non-stationary but they can be decomposed
into a time-varying mean wind speed component plus a well-behaved zero mean fluctuating wind speed
component admitted as a stationary random process with Gaussian distribution. Other wind characteristics such
as probability distribution of fluctuating wind speed, turbulence intensity, gust factor, and wind spectrum obtained
by the new approach seem to be more realistic than those gained by the traditional approach.

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