This paper describes a method for analyzing wind-induced vibrations of powe
r transmission towers coupled with power lines and the results of two case
studies. It also discusses the influence on response characteristics of dif
ferences in transmission support systems and differences between peak facto
rs, computed from a time -series and from power spectrum density. The resul
ts of this study show that differences in the way power transmission towers
support power lines have an influence on response characteristics, and pea
k factors computed from a time-series response are greater than those compu
ted from power spectrum density. (C) 1999 Elsevier Science Ltd. All rights
reserved.