Investigation on a Generalized Intervention Cost Function to Examine Wind-Induced Damage on Tall Buildings

摘要

This paper reviews and discusses some results on the simulation of the stochastic dynamics of a tall building, subjected to turbulent boundary layer wind loads. The stochastic model employs state augmentation. It includes a first zero-mean random variable (or state) representing either modeling simplifications or wind tunnel experimental errors, associated with the wind load estimation. A second zero-mean random variable is introduced to simulate the variability in the "intervention costs" needed to repair the wind-induced damage incurred by the building envelope. Two distinct scalar, generalized intervention cost functions are proposed: the first one depends on the squared value of the along-wind modal structural response; the second one also considers the influence of the cross-wind modal response on damage and the simultaneity of the response in the two directions. The model is recast into the formalism of stochastic differential equations. Parametric simulations examine the response of the CAARC (Commonwealth Advisory Aeronautical Research Council) benchmark building. The effect of static mean loads on the simulated damage and intervention cost simulations is also considered.