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Earthquakes and Structures Volume 26, Number 5, May 2024 , pages 383-400 DOI: https://doi.org/10.12989/eas.2024.26.5.383 |
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Large-scale cyclic test on frame-supported-transfer-slab reinforced concrete structure retrofitted by sector lead rubber dampers |
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Xin Xu, Yun Zhou, Zhang Yan Chen, Da yang Wang, Ke Jiang and Song Wang
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| Abstract | ||
| For a conventionally repaired frame-supported-transfer-slab (FSTS) reinforced concrete (RC) structure, both the transfer slab and the beam-to-column and transfer slab-to-column joints remain vulnerable to secondary earthquakes. Aimed at improving the seismic performance of a damaged FSTS RC structure, an innovative retrofitting scheme is proposed, which adopts the sector lead rubber dampers (SLRDs) at joints after the damaged FSTS RC structure is repaired by conventional approaches. In this paper, a series of quasi-static cyclic tests was conducted on a large-scale retrofitted FSTS RC structure. The seismic performance was evaluated and the key test results, including deformation characteristics, damage pattern, hysteretic behaviour, bearing capacity and strains on key components, were reported in detail. The test results indicated that the SLRDs started to dissipate energy under the service level earthquake, and thus prevented damages on the beam-to-column and transfer slab-to-column joints during the secondary earthquakes and shifted the plastic hinges away from the beam ends. The retrofitting scheme of using SLRDs also achieved the seismic design concept of 'strong joint, weak component'. The FSTS RC structure retrofitted by the SLRDs could recover more than 85% bearing capacity of its undamaged counterpart. The hysteresis curves were featured by the inverse "S" shape, indicating good bearing capacity and hysteresis performance. The deformation capacity of the damaged FSTS RC structure retrofitted by the SLRDs met the corresponding codified requirements for the case of the maximum considered earthquake, as set out in the Chinese seismic design code. The stability of the FSTS RC structure retrofitted by the SLRDs, which was revealed by the developed stains of the RC frame and transfer slab, was improved compared with the undamaged FSTS RC structure. | ||
| Key Words | ||
| cyclic testing; energy dissipation; led rubber damper; reinforced concrete structure; seismic retrofitting | ||
| Address | ||
| Xin Xu, Yun Zhou, Zhang Yan Chen, Da yang Wang and Song Wang: School of Civil Engineering, Guangzhou University, Waihuan Xi Road 230, Panyu District, Guangzhou, China Ke Jiang: Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand | ||