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Abstract:
The quasi-static tests of five concrete filled steel tube (CFST) reinforced concrete columns with hollow box section (CFSTRC-HBS columns for short) and one CFST lattice column were conducted to investigate the effect of in-plane limb spacing and axial compression ratio on the seismic performance of CFSTRC-HBS columns. The results indicate that CFSTRC-HBS columns exhibit pinch-shaped load-displacement hysteretic curves under horizontal reversed loading and the main failure modes are manifested as the horizontal cracks of outer concrete in the out-of-plane direction, the diagonal cracks of in-plane concrete web, and the vertical cracks and crushing of outer concrete at the column bottom. The whole loading process can be divided into elastic stage, repairable stage, stiffness degradation stage, bearing capacity degradation stage and residual bearing capacity stage. After the partial outer concrete is damaged and fails, the bearing capacity of CFSTRC-HBS columns decreases significantly, but the CFST lattice skeleton can continue to resist horizontal load. When the in-plane limb spacing increases from 500 mm to 650 mm, the elastic stiffness, the horizontal bearing capacity, and the cumulative energy dissipation increase by 44.6%, 26.0%, and 15.8% respectively. When the axial compression ratio increases from 0.10 to 0.20, the horizontal bearing capacity and the cumulative energy dissipation increase by 33.7% and 48.7%, respectively. Based on the theoretical analysis of the stress state of the plastic hinge section at the bottom of the column, the calculation method of the horizontal bearing capacity of CFSTRC-HBS columns with high precision is proposed, which is in good agreement with the test results. © 2021, Editorial Office of Journal of Building Structures. All right reserved.
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Journal of Building Structures
ISSN: 1000-6869
Year: 2021
Issue: 6
Volume: 42
Page: 108-117
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 2
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