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Steel and Composite Structures Volume 18, Number 3, March 2015 , pages 739-756 DOI: https://doi.org/10.12989/scs.2015.18.3.739 |
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Hysteresis of concrete-filled circular tubular (CFCT) T-joints under axial load |
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Liu Hongqing, Shao Yongbo, Lu Ning and Wang Qingli
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| Abstract | ||
| This paper presents investigations on the hysteretic behavior of concrete-filled circular tubular (CFCT) T-joints subjected to axial cyclic loading at brace end. In the experimental study, four specimens are fabricated and tested. The chord members of the tested specimens are filled with concrete along their full length and the braces are hollow section. Failure modes and load-displacement hysteretic curves of all the specimens obtained from experimental tests are given and discussed. Some indicators, in terms of stiffness deterioration, strength deterioration, ductility and energy dissipation, are analyzed to assess the seismic performance of CFCT joints. Test results indicate that the failures are primarily caused by crack cutting through the chord wall, convex deformation on the chord surface near brace/chord intersection and crushing of the core concrete. Hysteretic curves of all the specimens are plump, and no obvious pinching phenomenon is found. The energy dissipation result shows that the inelastic deformation is the main energy dissipation mechanism. It is also found from experimental results that the CFCT joints show clear and steady stiffness deterioration with the increase of displacement after yielding. However, all the specimens do not perform significant strength deterioration before failure. The effect of joint geometric parameters β and γ of the four specimens on hysteretic performance is also discussed. | ||
| Key Words | ||
| concrete-filled circular tubular (CFCT) T-joints; hysteretic behavior; experimental study; failure mode; energy dissipation | ||
| Address | ||
| (1) Liu Hongqing, Shao Yongbo, Lu Ning: School of Civil Engineering, Yantai University, Qingquan Road 32#, Laishan District, Yantai, Shandong Province, P.R. China, 264005; (2) Wang Qingli: School of Civil Engineering, Shenyang Jianzhu University, Hunnandong Road 9#, Shenyang, Liaoning Province, P.R. China, 110168. | ||