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Smart Structures and Systems Volume 24, Number 1, July 2019 , pages 001-14 DOI: https://doi.org/10.12989/sss.2019.24.1.001 |
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Temperature effect on seismic behavior of transmission tower-line system equipped with SMA-TMD |
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Li Tian, Juncai Liu, Canxing Qiu and Kunjie Rong
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| Abstract | ||
| Transmission tower-line system is one of most critical lifeline systems to cities. However, it is found that the transmission tower-line system is prone to be damaged by earthquakes in past decades. To mitigate seismic demands, this study introduces a tuned-mass damper (TMD) using superelastic shape memory alloy (SMA) spring for the system. In addition, considering the dynamic characteristics of both tower-line system and SMA are affected by temperature change. Particular attention is paid on the effect of temperature variation on seismic behavior. In doing so, the SMA-TMD is installed into the system, and its properties are optimized through parametric analyses. The considered temperature range is from -40 to 40C. The seismic control effect of using SMA-TMD is investigated under the considered temperatures. Interested seismic performance indices include peak displacement and peak acceleration at the tower top and the height-wise deformation. Parametric analyses on seismic intensity and frequency ratio were carried out as well. This study indicates that the nonlinear behavior of SMA-TMD is critical to the control effect, and proper tuning before application is advisable. Seismic demand mitigation is always achieved in this wide temperature range, and the control effect is increased at high temperatures. | ||
| Key Words | ||
| SMA-TMD; temperature effect; transmission tower-line system; vibration control; seismic analysis | ||
| Address | ||
| Li Tian, Juncai Liu, and Kunjie Rong: School of Civil Engineering, Shandong University, No. 17922 Jingshi Road, Jinan, Shandong 250061, China Canxing Qiu: Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China | ||