Abstract
Unique conductor-pole couplings complicate the dynamic behaviors of electric transmission pole line systems. Finite element modeling is performed on two typical transmission poles used in southeastern USA – a steel pole and a prestressed concrete pole. The two poles are representative of unique structure types: a heavy rod-like structure and a lightweight, shell-type structure. Since coupling issues between the pole and the cable introduce great complexities for modeling the pole line system, simplified numerical models are used. Limited full-scale modal test results are presented to verify the numerical models. The prestressed concrete pole is shown to be easier for mode identification than the steel pole – but both numerical models show complicated coupled vibration modes. This study is part of a larger study to establish an understanding of the dynamic response analyses of power grid under ground vibrations.
Highlights
Electric transmission lines are unique civil infrastructure for power delivery that typically supported by either transmission towers or pole-type structures
The work reported in this paper describes the study of dynamic behaviors of two operating transmission poles using Finite Element (FE) analysis
This study showed that displacements and internal forces in transmission lines are substantial under ground vibrations, and the dynamic effects may exceed those caused by the wind loads
Summary
Electric transmission lines are unique civil infrastructure for power delivery that typically supported by either transmission towers or pole-type structures. Studies of the free vibration of transmission pole structures are limited: Lantrip [13] conducted modal tests on several concrete pole structures under free-free boundary conditions and developed distributed mass models using ANSYS ; Chen et al [14] identified vibration modes of prestressed concrete poles using both modal testing and FE simulation and for both free-free and cantileveled conditions; Polyzois [15] used FE method to obtain natural frequency of composite poles; Dai and Chen [16] reported the influence of prestress effects on modal behaviors of prestressed concrete poles This paper presents both numerical and experimental studies on the modal behaviors of two transmission poles under operation: one is a prestressed concrete pole and the other is a steel pole. Free vibrations of the coupled transmission pole-line systems calculated with different models are compared
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