Experimental study on seismic behavior of square CFST column-composite beam single-side bolted rigid joint under high axial compression

doi:10.14006/j.jzjgxb.2022.0015

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Journal of Building Structures ›› 2023, Vol. 44 ›› Issue (07) : 105-115. DOI: 10.14006/j.jzjgxb.2022.0015

Special topics in disaster resistance and reduction of structures

Experimental study on seismic behavior of square CFST column-composite beam single-side bolted rigid joint under high axial compression

DING Faxing¹, WEI Xinyi¹, PAN Zhicheng^2,3, WANG Liping¹, LEI Jianxiong¹, CHEN Jun⁴, HU Mingwen⁵, YANG Jian⁶

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Abstract

To solve the potential safety problems of the bolted joints between concrete-filled square steel tubular columns and composite beams under seismic action, in this paper, nine end-plate bolted connections and three stiffening rings rigidly connected concrete-filled steel tubular (CFST) column-composite beam joints were tested under horizontal and low-cycle reciprocating loads. The effects of tie bars, axial compression ratio, beam height, stiffeners, and connection methods on the hysteretic properties of joint specimens, such as failure mode, hysteretic energy dissipation, skeleton curve, stiffness degradation, flexural bearing capacity and ductility coefficient were also discussed. The experimental results show that under three axial compression ratios (0.2、0.6、0.8), due to the reinforcement and restraint effect of the “strong column” structure of the inner tie bars on the core area and column ends of the above types of joints, the specimens all show the bending failure of the beam end, avoiding the phenomenon of bending failure at the column end of the common test piece without tie bar when the high axial compression ratio is 0.8. The hysteresis curve of the bolt joints under the “strong column” structure of tie-bars is fuller, after adding stiffeners or increasing secition height of beams and higher “strong beam” structures. And the initial rotational stiffness, flexural bearing capacity and energy dissipation capacity are improved, avoiding the pinching and slipping of the hysteretic curve of the common bolt joint specimen, the obvious descending section of the skeleton curve, and the rapid attenuation of stiffness and bearing capacity. The bolted joint after the “strong column and strong beam” structure has the same initial rotational stiffness and flexural bearing capacity, and better seismic performance compared with the welded reinforcement joint after the “strong column” structure. The proposed joint technology of the bolted rigid joint can realize the seismic effect of welded reinforcement joints.

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CFST / composite beam / bolted rigid connection / tie bar / quasi-static test / seismic behavior

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DING Faxing, WEI Xinyi, PAN Zhicheng, WANG Liping, LEI Jianxiong, CHEN Jun, HU Mingwen, YANG Jian. Experimental study on seismic behavior of square CFST column-composite beam single-side bolted rigid joint under high axial compression[J]. Journal of Building Structures, 2023, 44(07): 105-115. https://doi.org/10.14006/j.jzjgxb.2022.0015

References

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Published
2023-07-05
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2023-06-26

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