A STUDY ON THE NONSTATIONARITY IN WIND AND WIND-INDUCED RESPONSE OF TALL BUILDINGS FOR ADAPTIVE ACTIVE CONTROL

The nonstationarity in wind and its effects on the response of tall bu ildings are studied from the point of view of developing an adaptive a ctive control scheme. The wavelet analysis of the wind and the structu ral response shows that the distribution of wind gusts with frequency close to the structural frequency could be one of the causes of nonsta tionarity in the structural response. It is also observed that the use of a longer averaging time results in a higher average peak factor fo r response and thus requiring one to develop a more robust control sys tem, whereas a small averaging time may require frequent updating of t he control system which is practically undesirable.