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Earthquakes and Structures Volume 13, Number 2, August 2017 , pages 211-220 DOI: https://doi.org/10.12989/eas.2017.13.2.211 |
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Collapse simulations of a long span transmission tower-line system subjected to near-fault ground motions |
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Li Tian, Haiyang Pan, Ruisheng Ma and Canxing Qiu
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| Abstract | ||
| Observations from past strong earthquakes revealed that near-fault ground motions could lead to the failure, or even collapse of electricity transmission towers which are vital components of an overhead electric power delivery system. For assessing the performance and robustness, a high-fidelity three-dimension finite element model of a long span transmission tower-line system is established with the consideration of geometric nonlinearity and material nonlinearity. In the numerical model, the Tian-Ma-Qu material model is utilized to capture the nonlinear behaviours of structural members, and the cumulative damage D is defined as an index to identify the failure of members. Consequently, incremental dynamic analyses (IDAs) are conducted to study the collapse fragility, damage positions, collapse margin ratio (CMR) and dynamic robustness of the transmission towers by using twenty near-fault ground motions selected from PEER. Based on the bending and shear deformation of structures, the collapse mechanism of electricity transmission towers subjected to Chi-Chi earthquake is investigated. This research can serve as a reference for the performance of large span transmission tower line system subjected to near-fault ground motions. | ||
| Key Words | ||
| long span transmission tower-line system; collapse simulation; near-fault ground motion; collapse fragility; collapse mechanism | ||
| Address | ||
| Li Tian, Haiyang Pan, Ruisheng Ma and Canxing Qiu: School of Civil Engineering, Shandong University, Jinan, Shandong, 250061, China Ruisheng Ma: Centre for Infrastructure Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University, Kent Street, Bentley, WA 6102, Australia | ||