拉筋约束薄壁方钢管混凝土短柱轴压性能

doi:10.13229/j.cnki.jdxbgxb20210559

摘要/Abstract

摘要：

通过对拉筋约束薄壁方钢管混凝土短柱的轴压试验，研究了混凝土强度、拉筋体积配箍率以及拉筋与钢管壁的连接方式对试件极限承载力、刚度、延性以及横向变形系数的影响。研究结果表明：内置拉筋有助于提高试件的极限承载力及延性，提高效果随着混凝土强度的提升而降低，随着拉筋体积配箍率的增大而提升；拉筋与钢管壁焊接处理后，试件的各项力学性能并无明显改变；利用极限强度理论对极限状态下的试件进行力学分析，推导出拉筋约束方钢管混凝土轴压短柱极限承载力的计算公式，并结合其他文献中类似试件的试验数据对公式进行了验证，证明了本公式的正确性。

关键词: 钢管混凝土, 高强钢, 拉筋约束, 计算公式, 薄壁钢管

Abstract:

Through the axial compression test of the thin-walled concrete-filled square steel tube short column confined by the stirrup， the effects of the concrete strength， the volumetric stirrup ratio of the stirrup and the connection mode of the stirrup and the steel pipe wall on the ultimate bearing capacity， stiffness， ductility and transverse deformation coefficient of the specimen are studied. The research results show that the built-in reinforcement can help to improve the ultimate bearing capacity and ductility of the specimen. This improvement effect decreases with the increase of concrete strength， and increases with the increase of the volumetric stirrup ratio of the stirrup. After the stirrup is welded to the steel pipe wall， the mechanical properties of the test piece have not changed significantly. The ultimate strength theory is used to mechanically analyze the specimens in the ultimate state， and the formula for calculating the ultimate bearing capacity of the concrete-filled square steel tube short columns constrained by stirrup is deduced， and combined with the test data of similar specimens in other documents to verify the formula， which proves the correctness of the formula.

Key words: concrete-filled steel tube, high-strength steel, stirrup confined, calculation formula, thin-walled steel tube

中图分类号:

TU398

陈俊,倪家贵,刘哲,马雯波,邓旭华. 拉筋约束薄壁方钢管混凝土短柱轴压性能[J]. 吉林大学学报(工学版), 2023, 53(1): 170-177.

Jun CHEN,Jia-gui NI,Zhe LIU,Wen-bo MA,Xu-hua DENG. Axial compression performance of thin⁃walled concrete⁃filled square steel tube short columns confined by stirrup[J]. Journal of Jilin University(Engineering and Technology Edition), 2023, 53(1): 170-177.

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试件编号	拉筋间距	ρ_s/%	ρ_v/%	ρ_a/%	f_y/MPa	f_v/MPa	N_u/kN	提高比/%
S60?0?0	/	4.9	/	/	735.1	464.2	6015	/
S60?4?Z	@210	4.9	1.06	0.67	735.1	464.2	6275	4.3
S60?4?H	@210	4.9	1.06	0.67	735.1	464.2	6379	6.0
S60?8?Z	@90	4.9	2.12	1.34	735.1	464.2	6885	14.5
S60?8?H	@90	4.9	2.12	1.34	735.1	464.2	6991	16.2
S80?0?0	/	4.9	/	/	735.1	464.2	6684	/
S80?4?Z	@210	4.9	1.06	0.67	735.1	464.2	7326	9.6
S80?4?H	@210	4.9	1.06	0.67	735.1	464.2	6860	2.6
S80?8?Z	@90	4.9	2.12	1.34	735.1	464.2	7402	10.7
S80?8?H	@90	4.9	2.12	1.34	735.1	464.2	7375	10.3

数据来源	试件编号	f_cu/ MPa	P_v/ %	α/ %	f_y/ MPa	f_v/ MPa	N_u/ kN	N_t1/ kN	N_t2/ kN	N_t1/N_u	N_t2/N_u
本文	S60?0?0	71.2	0	4.9	735.1	/	6015	6035	5988	1.00	1.00
	S60?4?Z	71.2	1.06	4.9	735.1	464	6275	6449	6766	1.03	1.08
	S60?4?H	71.2	1.06	4.9	735.1	464	6379	6449	6766	1.01	1.06
	S60?8?Z	71.2	2.12	4.9	735.1	464	6885	7002	7435	1.02	1.08
	S60?8?H	71.2	2.12	4.9	735.1	464	6991	7002	7435	1.00	1.06
	S80?0?0	81.9	0	4.9	735.1	/	6684	6647	6600	0.99	0.99
	S80?4?Z	81.9	1.06	4.9	735.1	464	7326	7062	7379	0.96	1.01
	S80?4?H	81.9	1.06	4.9	735.1	464	6860	7062	7379	1.03	1.08
	S80?8?Z	81.9	2.12	4.9	735.1	464	7402	7614	8048	1.03	1.09
	S80?8?H	81.9	2.12	4.9	735.1	464	7375	7614	8048	1.03	1.09
文献［14］	B1?a	38.5	/	4.6	253.3	/	5061	5071	5040	1.00	1.00
	B1?b	38.5	/	4.6	253.3	/	4927	5071	5040	1.03	1.02
	B2	38.5	0.72	4.6	253.3	1420	5450	5318	7560	0.98	1.39
	B3	38.5	0.96	4.6	253.3	1420	5658	5446	8318	0.96	1.47
	B4	38.5	1.44	4.6	253.3	1420	5869	5849	9814	1.00	1.67
文献［16］	B4?a	62.8	0.824	5.1	300	312	19134	17001	16412	0.889	0.99
	B4?b	62.8	1.186	5.1	300	298	19411	17299	16412	0.891	0.99
	B5	62.8	/	5.9	280	/	17940	17413	18028	0.971	0.94