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Structural Engineering and Mechanics Volume 82, Number 5, June10 2022 , pages 611-628 DOI: https://doi.org/10.12989/sem.2022.82.5.611 |
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Development of self-centring energy-dissipative rocking columns equipped with SMA tension braces |
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Yan-Wen Li, Michael C.H. Yam, Ping Zhang, Ke Ke and Yan-Bo Wang
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| Abstract | ||
| Energy-dissipative rocking (EDR) columns are a class of seismic mitigation device capable of dissipating seismic energy and preventing weak-story failure of moment resisting frames (MRFs). An EDR consists of two hinge-supported steel columns interconnected by steel dampers along its height. Under earthquakes, the input seismic energy can be dissipated by plastic energy of the steel dampers in the EDR column. However, the unrecoverable plastic deformation of steel dampers generally results in residual drifts in the structural system. This paper presents a proof-of-concept study on an innovative device, namely self-centring energy-dissipative rocking (SC-EDR) column, aiming at enabling self-centring capability of the EDR column by installing a set of shape memory alloy (SMA) tension braces. The working mechanism of the SC-EDR column is presented in detail, and the feasibility of the new device is carefully examined via experimental and numerical studies considering the parameters of the SMA bar diameter and the steel damper plate thickness. The seismic responses including load carrying capacities, stress distributions, base rocking behaviour, source of residual deformation, and energy dissipation are discussed in detail. A rational combination of the steel damper and the SMA tension braces can achieve excellent energy dissipation and self-centring performance. | ||
| Key Words | ||
| energy dissipation; self-centring; shape memory alloy (SMA); steel rocking column; tension brace | ||
| Address | ||
| Yan-Wen Li: Department of Architecture and Architectural Engineering, Kyoto University, Kyoto, Japan; Department of Building & Real Estate, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China Michael C.H. Yam: Department of Building & Real Estate, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China Ping Zhang: Department of Building & Real Estate, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China Ke Ke: Key Laboratory of New Technology for Construction of Cities in Mountain Area, School of Civil Engineering, Chongqing University, Chongqing, China Yan-Bo Wang: College of Civil Engineering, Tongji University, Shanghai 200092, China | ||