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CLC number: TU393.3

On-line Access: 2011-02-08

Received: 2010-02-25

Revision Accepted: 2010-05-13

Crosschecked: 2011-01-05

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Journal of Zhejiang University SCIENCE A 2011 Vol.12 No.2 P.103-120

http://doi.org/10.1631/jzus.A1000067


Response of a transmission tower-line system at a canyon site to spatially varying ground motions


Author(s):  Hong-nan Li, Feng-long Bai, Li Tian, Hong Hao

Affiliation(s):  State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China, School of Civil and Resource Engineering, University of Western Australia, WA 6009, Australia

Corresponding email(s):   baifenglong816@163.com

Key Words:  Transmission tower-line system, Canyon site, Spatially varying ground motions, Coherency loss, Local site effect


Hong-nan Li, Feng-long Bai, Li Tian, Hong Hao. Response of a transmission tower-line system at a canyon site to spatially varying ground motions[J]. Journal of Zhejiang University Science A, 2011, 12(2): 103-120.

@article{title="Response of a transmission tower-line system at a canyon site to spatially varying ground motions",
author="Hong-nan Li, Feng-long Bai, Li Tian, Hong Hao",
journal="Journal of Zhejiang University Science A",
volume="12",
number="2",
pages="103-120",
year="2011",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1000067"
}

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%T Response of a transmission tower-line system at a canyon site to spatially varying ground motions
%A Hong-nan Li
%A Feng-long Bai
%A Li Tian
%A Hong Hao
%J Journal of Zhejiang University SCIENCE A
%V 12
%N 2
%P 103-120
%@ 1673-565X
%D 2011
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1000067

TY - JOUR
T1 - Response of a transmission tower-line system at a canyon site to spatially varying ground motions
A1 - Hong-nan Li
A1 - Feng-long Bai
A1 - Li Tian
A1 - Hong Hao
J0 - Journal of Zhejiang University Science A
VL - 12
IS - 2
SP - 103
EP - 120
%@ 1673-565X
Y1 - 2011
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1000067


Abstract: 
Collapses of transmission towers were often observed in previous large earthquakes such as the Chi-Chi earthquake in Taiwan and Wenchuan earthquake in Sichuan, China. These collapses were partially caused by the pulling forces from the transmission lines generated from out-of-phase responses of the adjacent towers owing to spatially varying earthquake ground motions. In this paper, a 3D finite element model of the transmission tower-line system is established considering the geometric nonlinearity of transmission lines. The nonlinear responses of the structural system at a canyon site are analyzed subjected to spatially varying ground motions. The spatial variations of ground motion associated with the wave passage, coherency loss, and local site effects are given. The spatially varying ground motions are simulated stochastically based on an empirical coherency loss function and a filtered Tajimi-Kanai power spectral density function. The site effect is considered by a transfer function derived from 1D wave propagation theory. Compared with structural responses calculated using the uniform ground motion and delayed excitations, numerical results indicate that seismic responses of transmission towers and power lines are amplified when considering spatially varying ground motions including site effects. Each factor of ground motion spatial variations has a significant effect on the seismic response of the structure, especially for the local site effect. Therefore, neglecting the earthquake ground motion spatial variations may lead to a substantial underestimation of the response of transmission tower-line system during strong earthquakes. Each effect of ground motion spatial variations should be incorporated in seismic analysis of the structural system.

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