Abstract
Transmission tower-line systems are designed using static loads specified in various codes. This paper compares the dynamic response of a test transmission line with the response due to static loads given by Eurocode. Finite element design software SAP2000 was used to model the towers and lines. Non-linear dynamic analysis including the large displacement effects was carried out. Macroscopic aspects of wind coherence along element length and integration time step were investigated. An approach is presented to compare the probabilistic dynamic response due to 7 different stochastically simulated wind fields with the response according to EN-50341. The developed model will be used to study the response recorded on a test line due to the actual wind speed time history recorded. It was found that static load from EN overestimated the strength of conductor cables. The response of coupled system considering towers and cables was found to be different from response of only cables with fixed supports.
Highlights
Collapse of transmission tower-line systems is not a well understood phenomenon
This thesis is aimed at understanding the dynamic behavior of transmission tower-line systems under fluctuating wind loads
Coupled transmission tower-line systems are highly complex in their behavior due to the interaction between non-linear conductors and stiff towers which results in closely spaced frequencies. [2] studied these systems considering the geometric non-linearity and aerodynamic damping; the work was not in 3 dimensions. [3] presented linear response in a coupled system using a 3D finite element model. [4] recently showed that the design codes overestimate the strength of transmission towers
Summary
Collapse of transmission tower-line systems is not a well understood phenomenon. These systems are subjected to various loads like wind, snow, icing and earthquake. Coupled transmission tower-line systems are highly complex in their behavior due to the interaction between non-linear conductors and stiff towers which results in closely spaced frequencies. [4] recently showed that the design codes overestimate the strength of transmission towers They brought out that a 3D finite element analysis is more accurate compared to linear analysis. Not many researchers have studied the coupling effect on response of cables using non-linear dynamic analysis. Methods lately published for calculating extreme values of a non-Gaussian process were used These extreme values were compared to the response due to wind pressure recommended in EN-50341. The results were compared to show the importance of conductor-tower interaction
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