螺旋箍筋-波纹管浆锚连接锚固性能试验

doi:10.13229/j.cnki.jdxbgxb.20221478

Abstract

Abstract:

To provide theoretical data for the spiral stirrup-corrugated pipe grout splicing used in prefabricated structures field， 21 anchorage pull-out specimens were designed and fabricated. The failure mode，load-displacement curves and the influence of different influencing factors on the bond anchorage strength of the specimen were analyzed by the pull-out test.The test results show that the failure modes of the specimens include rebar pull-out， splitting pull-out， rebar fracture and splitting fracture. The bond strength decreases with the increase of anchorage length and rebar diameter.The ultimate bond strength varies nonlinearly with the diameter of the corrugated pipe as the diameter increases. The average ultimate bond strength increases with increasing grout strength and the anchorage length can be further reduced to 5d.In engineering applications，when the rebar diameter is no more than 16 mm，the anchorage length is recommended to be 5d to 7d and the corrugated pipe diameter to be 2.5 to 2.8，and when the grout strength f_cu≥80 MPa， the anchorage length is not less than 5d.

Key words: structural engineering, spiral stirrup-corrugated pipe, grout splicing, pull-out test, anchorage performance, anchorage length

CLC Number:

TU375

Jin-quan ZHAO,Long ZHOU,Yong-gang DING,Rong-ji ZHU. Experiment on anchoring performance of spiral stirrup-corrugated pipe grout splicing[J].Journal of Jilin University(Engineering and Technology Edition), 2024, 54(9): 2484-2494.

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强度等级		抗压强度/MPa	平均值/MPa	抗拉强度/MPa	平均值/MPa
混凝土	C30	39.1	39.5	-	-
		39.4	39.5	-	-
		40.2	39.5	-	-
水泥基灌浆料	C60	70	74	4.61	5.09
		68	74	5.22	5.09
		84	74	5.43	5.09
	C80	81.2	81.7	7.17	6.82
		83	81.7	6.32	6.82
		81	81.7	6.98	6.82

钢筋直径/mm	屈服强度/MPa	极限强度/MPa	平均屈服强度/MPa	平均极限强度/MPa
14	431.3	576.3	433.2	568.2
	430.1	565.2	433.2	568.2
	438.2	569.1	433.2	568.2
16	437.9	597.2	445.4	599
	450.3	600.6	445.4	599
	447.9	599.3	445.4	599

试件编号	钢筋直径d/mm	波纹管直径D/mm	孔径比D/d	有效锚固长度l_a/mm	灌浆料强度/MPa
14-D40-3d-60	14	40	2.86	3d	60
14-D50-3d-60	14	50	3.57	3d	60
14-D60-3d-60	14	60	4.28	3d	60
14-D40-5d-60	14	40	2.86	5d	60
14-D50-5d-60	14	50	3.57	5d	60
14-D60-5d-60	14	60	4.28	5d	60
14-D40-7d-60	14	40	2.86	7d	60
14-D50-7d-60	14	50	3.57	7d	60
14-D60-7d-60	14	60	4.28	7d	60
16-D40-3d-60	16	40	2.50	3d	60
16-D50-3d-60	16	50	3.13	3d	60
16-D60-3d-60	16	60	3.75	3d	60
16-D40-5d-60	16	40	2.50	5d	60
16-D50-5d-60	16	50	3.13	5d	60
16-D60-5d-60	16	60	3.75	5d	60
16-D40-7d-60	16	40	2.50	7d	60
16-D50-7d-60	16	50	3.13	7d	60
16-D60-7d-60	16	60	3.75	7d	60
16-D40-3d-80	16	40	4.28	3d	80
16-D40-5d-80	16	40	3.13	5d	80
16-D40-7d-80	16	40	3.75	7d	80

试件编号	D/d	极限荷载F_u/kN	极限黏结强度τ_u/MPa	破坏形态
14-D40-3d-60	2.86	64.84	35.12	P
14-D50-3d-60	3.57	67.40	36.55	P
14-D60-3d-60	4.28	69.35	37.56	P
14-D40-5d-60	2.86	86.16	28.00	PS
14-D50-5d-60	3.57	87.82	29.01	P
14-D60-5d-60	4.28	92.66	30.11	B
14-D40-7d-60	2.86	90.93	21.11	B
14-D50-7d-60	3.57	90.55	21.02	B
14-D60-7d-60	4.28	91.10	21.15	B
16-D40-3d-60	2.50	92.34	38.31	PS
16-D50-3d-60	3.13	93.12	38.62	PS
16-D60-3d-60	3.75	91.77	38.06	P
16-D40-5d-60	2.50	105.42	26.23	PS
16-D50-5d-60	3.13	116.18	28.91	PS
16-D60-5d-60	3.75	112.48	27.98	PS
16-D40-7d-60	2.50	118.61	21.08	BS
16-D50-7d-60	3.13	117.59	20.90	B
16-D60-7d-60	3.75	118.78	21.11	B
16-D40-3d-80	2.50	97.58	40.41	P
16-D40-5d-80	2.50	119.14	29.65	B
16-D40-7d-80	2.50	118.90	21.13	B

试件	τ_u试/MPa	τ_u计/MPa	τ_u计/τ_u试	l_a^cr/mm	l_a^u/mm	破坏形态
14-D40-3d-60	35.11	37.48	1.06	37.5	73.3	P，Y
14-D50-3d-60	36.55	37.93	1.04	36.1	71.5	P，Y
14-D60-3d-60	37.56	38.83	1.03	34.8	69.7	P，Y
14-D40-5d-60	28.00	27.76	0.99	37.5	73.3	PS，Y
14-D50-5d-60	28.54	28.09	0.98	36.1	71.5	P，Y
14-D60-5d-60	30.11	28.43	0.94	34.8	69.7	B
14-D40-7d-60	21.11	23.59	1.12	37.5	73.3	B
14-D50-7d-60	21.02	23.88	1.14	36.1	71.5	B
14-D60-7d-60	21.15	24.16	1.14	34.8	69.7	B
16-D40-3d-60	38.31	37.26	0.97	47.4	94.1	PS，Y
16-D50-3d-60	39.24	37.65	0.96	45.9	92.2	PS，Y
16-D60-3d-60	38.06	38.05	0.99	44.6	90.4	P，Y
16-D40-5d-60	26.23	27.59	1.05	47.4	94.1	PS，Y
16-D50-5d-60	28.91	27.88	0.96	45.9	92.2	PS，Y
16-D60-5d-60	27.99	28.18	1.00	44.6	90.4	PS，Y
16-D40-7d-60	21.08	23.45	1.11	47.4	94.1	BS
16-D50-7d-60	20.90	23.70	1.13	45.9	92.2	B
16-D60-7d-60	21.11	23.95	1.13	44.6	90.4	B
16-D40-3d-80	40.40	41.13	1.02	34.6	77.0	P，Y
16-D40-5d-80	29.65	30.46	1.03	34.6	77.0	B
16-D40-7d-80	21.13	25.89	1.23	34.6	77.0	B

Experiment on anchoring performance of spiral stirrup-corrugated pipe grout splicing

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