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Vol. 43 (2002) No. 1 April n. 138


EVALUATION OF SIMPLIFIED GUY MODELS IN THE DYNAMIC ANALYSIS OF GUYED MASTS

< Table of Contents for Vol. 43 (2002) No. 1 April n. 138
  • Journal Name: Journal of the International Association for Shell and Spatial Structures (J. IASS)
  • ISSN: (Electronic Version) 1996-9015
  • ISSN: (Print Version) 1028-365X
  • Issue: Vol. 43 (2002) No. 1 April n. 138
  • Pages: 41-55
  • Title: EVALUATION OF SIMPLIFIED GUY MODELS IN THE DYNAMIC ANALYSIS OF GUYED MASTS
  • Author(s): B. F. Sparling, A. G. Davenport
  • Keywords: Guyed Masts, Guy Cables, Dynamic Analysis, Wind Loading, Nonlinear Behaviour.
Abstract
Although the cables used in guyed masts exhibit significant nonlinearities, linear guy models are frequently used to simplify dynamic response calculations. In this study, the dynamic behaviour of a guyed mast subjected to turbulent winds was investigated numerically using both nonlinear catenary and simplified spring-mass representations for the guys. The required turbulence time histories were simulated using a second-order autoregressive process to produce spatial and time-varying turbulent characteristics similar to those of the natural wind. Good agreement was obtained in the resulting dynamic mast displacements when the taut windward guys dominated the response. More substantial discrepancies between the linear and nonlinear models were apparent when slackened leeward guys made significant contributions. To help explain the observed differences, frequency-dependent stiffness characteristics of selected guys from the mast in question were studied. Also compared were mast bending moments, natural frequencies, and mode shapes for the different guyed mast models.

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