Chapter
Nov 9, 2012
Effect of the Dynamic Soil-Structure Interaction on Rigid Transmission Line Towers Subjected to Wind and Impulse Loads
Publication: Electrical Transmission and Substation Structures 2012: Solutions to Building the Grid of Tomorrow
Abstract
Transmission lines (TL) towers are traditionally analyzed assuming fixed base. However, this assumption is questionable as foundation is not rigid in most cases. In other fields, such as seismic engineering, it has been reported in the past that the foundation stiffness and damping affects the structural behavior while in interaction with the structure specifically under dynamic loads. In this paper, the soil-structure interaction (SSI) effect on transmission line (TL) behavior is studied. The soil is replaced by foundation impedance, a set of frequency dependent spring and dashpot. For this purpose, a parametric study on a simplified case is presented for two types of dynamic loads: wind load and impulse load supposed to represent the effect of the shock wake following the breakage of a conductor of ground wire. To complement this parametric study, a real case is used in the analysis. The behaviour of the foundation is determined with software FLAC with its foundation impedance. Two types of soil are used in the analysis: (i) cohesive soil; (ii) granular soil. The paper confirms that foundations can modify structural behaviour significantly.
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© 2012 American Society of Civil Engineers.
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Published online: Nov 9, 2012
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Researcher, Department of Civil Engineering, Université de Sherbrooke, Sherbrooke (Québec), J1K2R1. Canada. E-mail: [email protected]
Professor, Department of Civil Engineering, Université de Sherbrooke, Sherbrooke (Québec), J1K2R1. Canada. E-mail: [email protected]
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