单向带抗剪键叠合板的受力性能试验

doi:10.13229/j.cnki.jdxbgxb20181062

Abstract

Abstract:

In order to study the mechanical characteristics of the laminated slab with shear keys, a static test with 7 slabs was carried out and an supplementary analysis was made by finite element method. The results show that different types of shear keys can ensure the reliability of the interface of the laminated slab to enable its mechanical characteristics close to the cast-in-place slab. The concrete is firmly bonded between cast-in-place layer and precast layer, and between shear key and precast layer, which has a good integrity. The simply supported laminated slab with shear keys can be approximately calculated according to the once force bearing component when the span is less than 3.2 m. When the contact between the precast base plate and the cast-in-place layer is made in a friction manner, the yield load of the laminated slab increases and the yield displacement decreases with the increases in the number of rows of shear key, the number of columns of shear key and the cross-sectional area. The number of columns of shear key has a more obvious influence. When the above three factors increase to a certain extent, the influence is no longer obvious. After a certain number of shear keys are arranged, the strength grade of the concrete of shear key, the strength grade of the concrete of cast-in-place layer, and the friction coefficient have little influence on the bearing capacity of the laminated slab and the yield displacement. Finally, the stiffness formula of the laminated slab with shear keys is established.

Key words: civil engineering, laminated slab, shear key, mechanical properties, influence factor, stiffness formula

CLC Number:

TU375.2

Ming LI,Hao-ran WANG,Wei-jian ZHAO. Experimental of loading-bearing capacity of one-way laminated slab with shear keys[J].Journal of Jilin University(Engineering and Technology Edition), 2020, 50(2): 654-667.

Figures/Tables 27

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编号	构造形式	板长/mm	板宽/mm	板厚/mm	板混凝土强度等级	抗剪键形式	抗剪键行间距/mm	抗剪键列间距/mm	抗剪键混凝土强度等级
SJ1	现浇板	2 410	1 220	100	C25	-	-	-	-
SJ2	叠合板	2 410	1 220	100	C25	弧形	300	320	C30
SJ3	叠合板	2 410	1 220	100	C25	弧形	300	450	C30
SJ4	叠合板	2 410	1 220	100	C25	弧形	300	560	C30
SJ5	叠合板	2 410	1 220	100	C25	-	-	-	C30
SJ6	叠合板	2 410	1 220	100	C25	正方体	300	450	C30
SJ7	叠合板	2 410	1 220	100	C25	内置钢筋笼弧形	300	450	C30

组别	编号	开裂荷载/kN	极限荷载/kN
第一组	SJ1	19.2	32.3
	SJ3	18.5	30.9
	SJ5	18.1	28.8
第二组	SJ2	18.7	31.5
	SJ3	18.5	30.9
	SJ4	18.3	30.0
	SJ5	18.1	28.8
第三组	SJ3	18.5	30.9
	SJ6	18.6	31.2
	SJ7	18.9	32.0

板编号	板跨度/m	B_s/10³(kN·m²)	B_c/10³(kN·m²)	B_s/B_c
SJ8	2.4	3.94	3.83	0.029
SJ9	2.6	4.26	4.15	0.031
SJ10	2.8	4.67	4.49	0.037
SJ11	3.0	5.14	4.89	0.042
SJ12	3.2	5.65	5.38	0.047
SJ13	3.4	6.22³	5.84	0.062
SJ14	3.6	6.84	6.29	0.081
SJ15	3.8	7.62	6.81	0.105
SJ16	4.0	8.25³	7.17	0.134

板编号	抗剪键行数	抗剪键列数	抗剪键行间距/mm	抗剪键列间距/mm	抗剪键面积/mm²	抗剪键强度等级	现浇板强度等级	摩擦因数
SJ	4	6	300	450	100×100	C30	C25	0.8
R-6	6	6	180	450	100×100	C30	C25	0.8
R-3	3	6	450	450	100×100	C30	C25	0.8
R-2	2	6	900	450	100×100	C30	C25	0.8
L-10	4	10	300	250	100×100	C30	C25	0.8
L-8	4	8	300	321	100×100	C30	C25	0.8
L-5	4	5	300	563	100×100	C30	C25	0.8
L-4	4	4	300	750	100×100	C30	C25	0.8
A_k-150	4	6	283	440	150×150	C30	C25	0.8
A_k-120	4	6	293	446	120×120	C30	C25	0.8
A_k-80	4	6	300	450	80×80	C30	C25	0.8
A_k-40	4	6	300	450	40×40	C30	C25	0.8
C_k-40	4	6	300	450	100×100	C40	C25	0.8
C_k-20	4	6	300	450	100×100	C20	C25	0.8
C_x-35	4	6	300	450	100×100	C30	C35	0.8
C_x-20	4	6	300	450	100×100	C30	C20	0.8
f-0.6	4	6	300	450	100×100	C30	C25	0.6
f-0.4	4	6	300	450	100×100	C30	C25	0.4
f-0	4	6	300	450	100×100	C30	C25	0

板编号	B_d/10³（kN·m²）	B_d/B_x	r
SJ	3.67	0.91	0.082
R-6	3.78	0.94	0.122
R-3	3.58	0.92	0.061
R-2	3.47³	0.86	0.041
L-10	3.87	0.96	0.136
L-8	3.74	0.93	0.109
L-5	3.58	0.89	0.068
L-4	3.46	0.86	0.054
A_k-150	3.94	0.98	0.184
A_k-120	3.86	0.96	0.118
A_k-80	3.54	0.86	0.052
A_k-40	3.31	0.82	0.013

Experimental of loading-bearing capacity of one-way laminated slab with shear keys

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