负弯矩作用下可拆卸预制装配式组合梁力学性能试验

doi:10.13229/j.cnki.jdxbgxb20200825

Abstract

Abstract:

Four detachable prefabricated composite beams are designed and their mechanical properties under the action of negative bending moment are studied by taking shear connection degree and debonding treatment as test parameters. The test results show that：①the shear coupling degree can improve the anti-cracking performance of the detachable composite beam under the action of negative bending moment， but it has little influence on its ultimate bearing capacity and stiffness. ②Partial debonding treatment of anti-shear joints can improve the mechanical properties of detachable composite beams under the action of negative bending moment， delay the development of cracks， and have little influence on the stiffness and ultimate bearing capacity of specimens. However， this treatment has a more obvious effect on the improvement of specimens with complete shear connections. ③Under the action of negative bending moment， the rotation capacity of the detachable composite beam still has a large room for improvement. Both the debonding treatment and the increase of shear connection degree can improve the rotation capacity of the composite beam， which can be further optimized.

Key words: building structure, composite structure, composite beams, negative bending moment, debonding treatment

CLC Number:

TU398.9

Jun CHEN,Shao-xian WANG,Hui XU,Duan-quan MO,Jing-si HUO,Xu-hua DENG. Experiment on mechanical properties of detachable prefabricated composite beams subjected to negative bending moment[J].Journal of Jilin University(Engineering and Technology Edition), 2022, 52(3): 604-614.

Figures/Tables 17

Table 1

Fig.1

Fig.2

Table 2

Fig.3

Fig.4

Fig.5

Table 3

Summary of tests"

试验状态		PHBCB-UB	PHBCB-B	PHBCB-B-S	PHBCB-UB-S
开裂状态	$P 1 / k N$	70	60	76	74
	$P 2 / k N$	120	60	90	150
	$P 3 / k N$	180	90	120	180
	$P 1 / P u$	0.153	0.138	0.166	0.164
	$P 2 / P u$	0.263	0.138	0.196	0.333
	$P 3 / P u$	0.394	0.207	0.262	0.400
	$S 60 / m m$	0.010	0.002	0.002	0.005
$ω l i m$ 状态	$P L / 200 / k N$	375.1	360	391.8	385.6
	$P L / 200 / P u$	0.822	0.827	0.855	0.857
	$ω L / 200 / m m$	13.5	13.5	13.5	13.5
	$a 360 / m m$	0.77	1.23	0.82	0.71
	$S 360 / m m$	0.35	0.573	0.401	0.118
$P u / 2$ 状态	$P u / 2 / k N$	228.2	217.6	229.3	225.1
	$ω 0.5 P u / m m$	5.268	5.458	4.437	4.637
	$ω 0.5 P u / L$	1/513	1/495	1/610	1/580
	$a 240 / m m$	0.39	0.55	0.387	0.387
	$S 240 / m m$	0.193	0.306	0.138	0.054
承载力极限状态	$P u / k N$	456.4	435.3	458.5	450.1
	$ω P u / m m$	35.982	43.31	33.436	36.409
	$ω P u / L$	1/75	1/62	1/81	1/76
	$a 破坏后 / m m$	11.11	13.3	15.6	15
	$S P u / m m$	0.799	0.882	0.812	0.271

Table 3

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Table 4

Characteristic moment value"

试件型号	$M c r / (k N ? m)$	$M y / (k N ? m)$	$M p / (k N ? m)$	$M u / (k N ? m)$	$M c r$	$M y / M u$	$M p / M u$
PHBCB-UB	47.25	243	279	308.070	0.153	0.788	0.905
PHBCB-B	40.5	214.9875	279	293.827	0.137	0.731	0.949
PHBCB-B-S	51.3	250.425	279	309.487	0.165	0.809	0.901
PHBCB-UB-S	49.95	244.89	279	303.817	0.164	0.806	0.918

Table 4

Table 5

R value of rotation capacity"

试件型号	$θ p$	$θ u$	$R = θ u θ p - 1$
PHBCB-UB	0.752	1.869	1.485
PHBCB-B	0.980	2.227	1.272
PHBCB-B-S	0.825	2.150	1.606
PHBCB-UB-S	0.815	2.160	1.649

Table 5

Table 6

Comparison of stiffness and deflection"

试件编号	荷载/kN	试验刚度/（ $1013 ? N ? m m 2$ ）	计算刚度/（ $1013 ? N ? m m 2$ ）	试验刚度/计算刚度	实测挠度/mm	未修正计算挠度/mm	挠度修正量/mm	修正后计算挠度/mm	修正前计算挠度∶实测挠度/%	修正后计算挠度∶实测挠度/%
PHBCB-UB	360.0	1.634	2.04	0.810	9.03	7.25	0.480	7.73	80.28	85.63
PHBCB-B	318.5	1.952	2.04	0.967	6.69	6.42	0.427	6.84	95.88	102.27
PHBCB-B-S	371.0	1.636	2.02	0.811	9.30	7.54	0.394	7.93	81.07	85.31
PHBCB-UB-S	362.8	1.870	2.02	0.827	7.95	7.37	0.385	7.76	92.68	97.53

Table 6

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钢材类型		屈服强度/MPa	极限强度/MPa
钢筋	C6	417.89	742.89
钢筋	C8	377.50	683.99
钢筋	C10	476.93	612.81
钢筋	C12	535.22	654.37
钢梁	翼缘	286.40	419.90
钢梁	腹板	338.04	458.01
连接件	高强螺栓	663.00	835.00

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Experiment on mechanical properties of detachable prefabricated composite beams subjected to negative bending moment

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试件编号	预制板设计强度/MPa	连接件个数	连接件直径/mm	是否脱黏处理	连接件纵向间距/mm	抗剪连接度	预紧力/kN
PHBCB-UB-S	40	36	16	是	150	1.38	25
PHBCB-B-S	40	36	16	否	150	1.38	25
PHBCB-UB	40	26	16	是	210	1	25
PHBCB-B	40	26	16	否	210	1	25