Axial Compression Behavior of High-Strength Circular Steel Tube Confined High-Strength Steel Reinforced Concrete Short Columns

doi:10.12141/j.issn.1000-565X.210463

Abstract

Abstract:

This paper carried out axial compression tests on nine circular steel tube confined steel reinforced (CSTCSR) concrete short columns, one circular steel tube confined (CSTC) concrete short column and one circular steel tube column filled with steel-reinforced concrete. The main purpose of this research is to study the influences of yield strength of steel tube and shape steel, diameter-thickness ratio of steel tube, concrete strength, inner surface treatment method of high-strength steel tube and restraint mode on the failure mode, strain response, axial compression bearing capacity and ductility of CSTCSR concrete short column. The results show that the failure mode of high-strength circular steel tube confined high-strength steel reinforced (HCSTCHSR) concrete short column is overall shear failure, and there is no obvious local buckling on the surface of high-strength steel tube, and the development of oblique cracks of concrete is effectively restricted by the embedded high-strength shape steel. For CSTCSR concrete short column, the axial compression bearing capacity ratio and ductility coefficient of this column with high-strength steel tube and high-strength shape steel are increased from 1.37 to 1.49 and from 2.22 to 3.25, respectively, compared with those of CSTCSR concrete short column using ordinary-strength steel tube and ordinary-strength shape steel. It is concluded that the HCSTCHSR concrete short column has more excellent axial bearing capacity and ductility, and high-strength steel using in such column can be fully utilized. On the basis of “technical standard for steel tube confined concrete structures” (JGJ/T471—2019) and the results of parametric analysis in this study, a modified formula for axial bearing capacity of HCSTCHSR concrete short column was proposed by using the existing confined concrete’s constitutive model to provide scientific basis and data support for practical engineering application.

Key words: high-strength steel tube, high-strength shape steel, axial compressive performance, axial bearing capacity

CLC Number:

TU375

KANG Lan, CHEN Zonglin, LIN Yiwei . Axial Compression Behavior of High-Strength Circular Steel Tube Confined High-Strength Steel Reinforced Concrete Short Columns[J]. Journal of South China University of Technology(Natural Science Edition), 2022, 50(7): 1-12.

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试件编号	D×T×L/ （mm×mm×mm）	D_a×B_a×t_w×t_f/ （mm×mm×mm×mm）	f_cu/MPa	f_yt/MPa	f_ya/MPa
YS-T4Y345-C50-W4A345	300×3.78×900	150×150×3.78×3.78	48.9	443.0	443.0
YS-T4Y345-C50-W4A690	300×3.78×900	150×150×4.10×4.10	48.9	443.0	763.8
YS-T4Y690-C50-W4A345	300×4.10×900	150×150×3.78×3.78	48.9	763.8	443.0
YS-T4Y690-C50-W4A690	300×4.10×900	150×150×4.10×4.10	48.9	763.8	763.8
YS-T6Y690-C50-W4A690	300×6.00×900	150×150×4.10×4.10	48.9	698.2	763.8
YS-T4Y690-C50-W6A690	300×4.10×900	150×150×6.00×6.00	48.9	763.8	698.2
YS-T4Y690-C80-W4A690	300×4.10×900	150×150×4.10×4.10	94.9	763.8	763.8
YS-T4Y690-C50-W4A690-R	300×4.10×900	150×150×4.10×4.10	48.9	763.8	763.8
YS-T4Y690-C50-W4A690-M	300×4.10×900	150×150×4.10×4.10	48.9	763.8	763.8
YS-T4Y690-C50	300×4.10×900	—	48.9	763.8	—
GG-T4Y690-C50-W4A690	300×4.10×900	150×150×4.10×4.10	48.9	763.8	763.8

钢材种类	名义厚度/mm	实测厚度/mm	屈服强度/MPa	极限强度/MPa	弹性模量/GPa	泊松比
Q345	4	3.78	443.0	603.1	203.9	0.297
Q690	4	4.10	763.8	812.3	203.6	0.279
Q690	6	6.00	698.2	754.7	204.1	0.286

编号	试件编号	N_u/kN	N_m/kN	N_u/N_m	Δ_u/mm	K₀/（kN·mm^-1）	μ
1	YS-T4Y345-C50-W4A345	6 764	4 950	1.37	5.07	2 039	2.22
2	YS-T4Y345-C50-W4A690	7 433	5 517	1.35	5.56	2 194	2.30
3	YS-T4Y690-C50-W4A345	8 838	6 143	1.44	9.79	2 019	3.32
4	YS-T4Y690-C50-W4A690	9 969	6 710	1.49	9.68	2 266	3.25
5	YS-T6Y690-C50-W4A690	11 138	7 668	1.45	11.71	2 232	3.54
6	YS-T4Y690-C50-W6A690	10 488	7 161	1.46	9.53	2 284	2.87
7	YS-T4Y690-C80-W4A690	12 202	9 605	1.27	6.40	2 515	1.68
8	YS-T4Y690-C50-W4A690-R	10 382	6 710	1.55	11.84	2 152	—
9	YS-T4Y690-C50-W4A690-M	（10 249）	6 710	—	—	—	—
10	YS-T4Y690-C50	7 997	5 428	1.47	7.40	1 933	2.58
11	GG-T4Y690-C50-W4A690	9 620	6 710	1.43	5.90	2 585	2.33

试件编号	N_u/kN	N_uF/kN	N_g/kN	N_x/kN	N_g/N_u	N_g/N_uF	N_x/N_u	N_x/N_uF
YS-T4Y345-C50-W4A345	6 764	6 869	4 561	6 908	0.674	0.664	1.021	1.006
YS-T4Y345-C50-W4A690	7 433	7 516	5 128	7 475	0.690	0.682	1.006	0.994
YS-T4Y690-C50-W4A345	8 838	9 433	4 561	9 211	0.516	0.480	1.042	0.970
YS-T4Y690-C50-W4A690	9 969	10 109	5 128	9 778	0.514	0.507	0.981	0.967
YS-T6Y690-C50-W4A690	11 138	12 239	5 023	11 447	0.451	0.410	1.028	0.935
YS-T4Y690-C50-W6A690	10 488	10 637	5 563	10 151	0.503	0.523	0.968	0.954
YS-T4Y690-C80-W4A690	12 203	12 987	9 471	13 109	0.776	0.729	1.074	1.009
平均值					0.593	0.571	1.017	0.977
标准差					0.111	0.111	0.034	0.026

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