In this paper an efficient procedure for determining spectral moments
of arbitrary order of the response of multi-degree-of-freedom (MDOF) l
inear systems under linearized pressure actions due to wind turbulence
is presented. The procedure is initiated by decomposing the n-variate
incoherent wind field velocity into a sum of it independent totally c
oherent wind field velocities. Then, the use of a standard discretizat
ion procedure for approximating the frequency dependent eigenvalues an
d eigenvectors of the power spectral density (PSD) matrix leads to a p
olynomial representation of each component of the PSD matrix. Based on
this representation, the spectral moments can be evaluated in a close
d form without resorting to numerical quadrature. An illustrative exam
ple is included.