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Structural Engineering and Mechanics Volume 71, Number 3, August10 2019 , pages 305-315 DOI: https://doi.org/10.12989/sem.2019.71.3.305 |
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Seismic failure analysis and safety assessment of an extremely long-span transmission tower-line system |
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Li Tian, Haiyang Pan, Ruisheng Ma and Xu Dong
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| Abstract | ||
| Extremely long-span transmission tower-line system is an indispensable portion of an electricity transmission system, and its failures or collapse can impact on the entire electricity grid, affect the modern life, and cause great economic losses. It is therefore imperative to investigate the failure and safety of the transmission tower subjected to ground motions. In the present study, a detailed finite element (FE) model of a representative extremely long-span transmission tower-line system is established. A segmental damage indicator (SDI) is proposed to quantitatively assess the damage level of each segment of the transmission tower under earthquakes. Additionally, parametric studies are conducted to investigate the influence of different ground motions and incident angles on the ultimate capacity and weakest segment of the transmission tower. Finally, the collapse fragility curve in terms of the maximum SDI value and PGA is plotted for the exampled transmission tower. The results show that the proposed SDI can quantitatively assess the damage level of the segments, and thus determine the ultimate capacity and weakest segment of the transmission tower. Moreover, the different ground motions and incident angles have a significant influence on the SDI values of the transmission tower, and the collapse fragility curve is utilized to evaluate the collapse resistant capacity of the transmission tower subjected to ground motions. | ||
| Key Words | ||
| extremely long-span transmission tower-line system; failure analysis; segmental damage indicator; different ground motions; seismic incident angles; collapse fragility curve | ||
| Address | ||
| School of Civil Engineering, Shandong University, Jinan, Shandong Province 250061, China | ||