Seismic Behaviour of Tall Guyed Telecommunication Towers

by Ghyslaine McClure, (M.ASCE), McGill Univ, Montreal, Canada,
Eduardo I. Guevara, McGill Univ, Montreal, Canada,



Document Type: Proceeding Paper

Part of: Spatial, Lattice and Tension Structures

Abstract:

This paper presents results of a detailed numerical modelling study of two guyed telecommunication towers subjected to seismic excitation: a 107-m (350 ft) tower with six stay levels, and a 342-m (1150 ft) tower with seven stay levels. Two horizontal accelerograms were used, S00E 1940 El Centro and N65E 1966 Parkfield, with each record being scaled to match the elastic design spectra of the 1990 National Building Code of Canada for the Montreal region. Elements of response generated were: guy cable tensions, horizontal shear forces in the mast, and displacements and rotations at the top of the mast. Effects of surface wave propagation were studied using asynchronous inputs at the ground anchorage points and at the base of the mast. Combined lateral and vertical ground motions were considered for the tallest tower. Results indicate important cable-mast interactions, predominant in the frequency range of the lower axial modes of the mast.



Subject Headings: Guyed towers | Cables | Seismic design | Seismic tests | Seismic effects | Communication systems | Foundation design | Surface waves | Canada | Montreal | Quebec

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