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Structural Engineering and Mechanics Volume 76, Number 2, October25 2020 , pages 251-267 DOI: https://doi.org/10.12989/sem.2020.76.2.251 |
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Critical seismic incidence angle of transmission tower based on shaking table tests |
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Li Tian, Xu Dong, Haiyang Pan, Guodong Gao and Aiqiang Xin
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| Abstract | ||
| Transmission tower-line systems have come to represent one of the most important infrastructures in today's society. Recent strong earthquakes revealed that transmission tower-line systems are vulnerable to earthquake excitations, and that ground motions may arrive at such structures from any direction during an earthquake event. Considering these premises, this paper presents experimental and numerical studies on the dynamic responses of a 1000 kV ultrahigh-voltage (UHV) transmission tower-line system under different seismic incidence angles. Specifically, a 1:25 reduced-scale experimental prototype model is designed and manufactured, and a series of shaking table tests are carried out. The influence of the seismic incidence angle on the dynamic structural response is discussed based on the experimental data. Additionally, the incidence angles corresponding to the maximum peak displacement of the top of the tower relative to the ground (referred to herein as the critical seismic incidence angles) are summarized. The experimental results demonstrate that seismic incidence angle has a significant influence on the dynamic responses of transmission tower-line systems. Subsequently, an approximation method is employed to orient the critical seismic incidence angle, and a corresponding finite element (FE) analysis is carried out. The angles obtained from the approximation method are compared with those acquired from the numerical simulation and shaking table tests, and good agreement is observed. The results demonstrate that the approximation method can properly predict the critical seismic incidence angles of transmission tower-line systems. This research enriches the available experimental data and provides a simple and convenient method to assess the seismic performance of UHV transmission systems. | ||
| Key Words | ||
| UHV transmission tower-line system, reduced-scale model, shaking table test, critical seismic incidence angle, approximation method | ||
| Address | ||
| Li Tian/Shandong University Xu Dong/Shandong University Haiyang Pan/Shandong University Guodong Gao/Shandong University Aiqiang Xin/Shandong University | ||