Abstract
In the event of a severe seismic excitation, preservation of essential infrastructures, such as telecommunication facilities, is of high priority. The objective of this paper is to investigate the geometrically nonlinear response of antenna-supporting guyed towers under earthquake loading. Two guyed towers are analysed: a 350 ft (107 m) tower with six stay levels and an 80 ft (24m) mast with only two stay levels. Two horizontal accelerograms are used, El Centro and Parkfield, with each record being scaled to match the elastic design spectra of the 1990 National Building Code of Canada. Elements of response analysed are: guy tensions, horizontal shears, and displacements and rotations at the tip of the mast. Results indicate that although the absolute values of the dynamic amplifications are well below the limit strength and serviceability criteria for such towers, dynamic interactions between the guywires and the mast are important, especially in the vertical direction. Multiple support excitation of the tallest tower also causes additional dynamic effects that are not present when only synchronous ground motion is studied.
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