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Smart Structures and Systems Volume 31, Number 5, May 2023 , pages 531-543 DOI: https://doi.org/10.12989/sss.2023.31.5.531 |
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Self-centering passive base isolation system incorporating shape memory alloy wires for reduction in base drift |
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Sania Dawood, Muhammad Usman, Mati Ullah Shah and Muhammad Rizwan
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| Abstract | ||
| Base isolation is one of the most widely implemented and well-known technique to reduce structural vibration and damages during an earthquake. However, while the base-isolated structure reduces storey drift significantly, it also increases the base drifts causing many practical problems. This study proposes the use of Shape Memory Alloys (SMA) wires for the reduction in base drift while controlling the overall structure vibrations. A multi-degree-of-freedom (MDOF) structure along with base isolators and Shape-Memory-Alloys (SMA) wires in diagonal is tested experimentally and analytically. The isolation bearing considered in this study consists of laminates of steel and silicon rubber. The performance of the proposed structure is evaluated and studied under different loadings including harmonic loading and seismic excitation. To assess the seismic performance of the proposed structure, shake table tests are conducted on base-isolated MDOF frame structure incorporating SMA wires, which is subjected to incremental harmonic and historic seismic loadings. Root mean square acceleration, displacement and drift are analyzed and discussed in detail for each story. To better understand the structure response, the percentage reduction of displacement is also determined for each story. The result shows that the reduction in the response of the proposed structure is much better than conventional base-isolated structure. | ||
| Key Words | ||
| Multi-Degree of freedom (MDOF); passive base isolators; seismic response; self-centering; shake table testing; shape memory alloys | ||
| Address | ||
| (1) Sania Dawood, Muhammad Usman, Mati Ullah Shah: School of Civil and Environmental Engineering (SCEE), National University of Sciences and Technology (NUST), H-12 Sector Islamabad 44000, Pakistan; (2) Muhammad Rizwan: Military College of Engineering (MCE), National University of Sciences and Technology (NUST), Risalpur, KPK 24080, Pakistan. | ||