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Advances in Concrete Construction Volume 12, Number 5, November 2021 , pages 399-409 DOI: https://doi.org/10.12989/acc.2021.12.5.399 |
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Axial compressive behavior of concrete-encased CFST stub columns with open composite stirrups |
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Xiaojun Ke, Wen Ding and Dingguo Liao
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| Abstract | ||
| The existing method to improve the coordination performance of the inner and outer parts of concrete-encased concrete-filled steel tube (CFST) composite columns by increasing the volume-stirrup ratio causes difficulties in construction due to over-dense stirrups. Thus, this paper proposes an open polygonal composite stirrup with high strength and high ductility CRB600H reinforced rebar, and seventeen specimens were constructed, and their axial compressive performance was tested. The main parameters considered were the volume-stirrup ratio, the steel tube size, the stirrup type and the stirrup strength. The test results indicated: For the specimens restrained by open octagonal composite stirrups, compared with the specimen of 0.5% volume-stirrup ratio, the compressive bearing capacity increased by 14.6%, 15.7% and 21.5% for volume-stirrup ratio of 0.73%, 1.07% and 1.61%, respectively. For the specimens restrained by open composite rectangle stirrups, compared with the specimen of 0.79% volume-stirrup ratio, the compressive bearing capacity increased by 7.5%, 6.1%, and -1.4% for volume-stirrup ratio of 1.12%, 1.58% and 2.24%, respectively. The restraint ability and the bearing capacity of the octagonal composite stirrup are better than other stirrup types. The specimens equipped with open polygonal composite stirrup not only had a higher ductility than those with the traditional closed-loop stirrup, but they also had a higher axial bearing capacity than those with an HPB300 strength grades stirrup. Therefore, the open composite stirrup can be used in practical engineering. A new calculation method was proposed based on the stress-strain models for confined concrete under different restrain conditions, and the predicted value was close to the experimental value. | ||
| Key Words | ||
| axial compression; CRB600H; composite column; concrete-filled steel tube; open polygonal composite stirrup | ||
| Address | ||
| Xiaojun Ke: College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China Wen Ding: College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China Dingguo Liao: College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China | ||
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