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Earthquakes and Structures Volume 18, Number 1, January 2020 , pages 015-25 DOI: https://doi.org/10.12989/eas.2020.18.1.015 |
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Seismic behaviour of concrete columns with high-strength stirrups |
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Peng Wang, Qingxuan Shi, Feng Wang and Qiuwei Wang
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| Abstract | ||
| The seismic behaviour of reinforced concrete (RC) columns made from high-strength materials was investigated experimentally. Six high-strength concrete specimen columns (1:4 scale), which included three with high-strength stirrups (HSSs) and three with normal-strength stirrups (NSSs), were tested under a combination of high axial and reversed cyclic loads. The effects of stirrup strength and the ratio of transverse reinforcement on the cracking patterns, hysteretic response, strength, stiffness, ductility, energy dissipation and strain of transverse reinforcement were studied. The results indicate that good seismic behaviour of an RC column subjected to high axial compression can be obtained by using a well-shaped stirrup. Stirrup strength had little effect on the lateral bearing capacity. However, the ductility was significantly modified by improving the stirrup strength. When loaded with a large lateral displacement, the strength reduction of NSS specimens was more severe than that of those with HSSs, and increasing the stirrup strength had little effect on the stiffness reduction. The ductility and energy dissipation of specimens with HSSs were superior to those with NSSs. When the ultimate displacement was reached, the core concrete could be effectively restrained by HSSs. | ||
| Key Words | ||
| RC column; high-strength stirrups; seismic behaviour; high compression ratio; ductility | ||
| Address | ||
| Peng Wang,Qingxuan Shi. Qiuwei Wang: State Key Laboratory of Green Building in Western China, Xi\'an University of Architecture & Technology, Xi\'an 710055, China Peng Wang, Qingxuan Shi, Feng Wang and Qiuwei Wang: College of Civil Engineering, Xi\'an University of Architecture & Technology, Xi\'an 710055, China Peng Wang, Qingxuan Shi and Qiuwei Wang: Structure and Seismic Key Laboratory, Xi\'an University of Architecture & Technology, Xi\'an 710055, China | ||