Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (5): 1509-1520.doi: 10.13229/j.cnki.jdxbgxb20180433

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Mechanical properties of laminated slab with shear keys

Ming LI(),Hao-ran WANG,Wei-jian ZHAO   

  1. School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
  • Received:2018-05-04 Online:2019-09-01 Published:2019-09-11

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Abstract:

In order to study the mechanical properties of laminated slab with shear keys, the necessity of setting shear keys was analyzed based on the experiment and finite element simulation method by comparing the load-deflection curves of the laminated slabs with different number of shear keys. The stress characteristics of the laminated slabs were analyzed by comparing the loading process of the laminated slab with shear keys and the cast-in-place slab. The damage process and the shear force distribution law of the shear keys were analyzed respectively by extracting the shear force of the shear keys, and the simplified calculation equation for the shear force was established. The results show that the shear keys can significantly improve the stiffness and the bearing capacity of the laminated slab. Compared with the cast-in-place slab, when the concrete at the bottom of the laminated slab is cracked and the steel bar is yielded, a significant difference exists in the distribution law of the first principal stress of the concrete at the bottom of the slab, while a similarity occurs in the stress distribution law of the steel bars and the displacement distribution law at the bottom of the slab. With the increase in the load, the shear force of each shear key in the laminated slab increases linearly and then drops suddenly. The shear force of the shear key is bigger as the shear key gets closer to the bearing. At last, the layout method of shear keys is put forward.

Key words: civil engineering, laminated slab, shear key, mechanical properties, distribution law

CLC Number: 

  • TU375.2

Fig.1

Loading system of experiment"

Fig.2

Precast baseplate with shear keys"

Fig.3

Comparison of load-deflection curves among simulation and experiment results"

Fig.4

Comparison of load-steel bar strain curves among simulation and experiment results"

Fig.5

Comparison of mid-deformation diagram among simulation and experiment results"

Table 1

Arrangement of shear keys and parameter information in the laminated slabs"

编号 抗剪键

现浇层

强度等级

预制底板

强度等级

现浇板

强度等级

钢筋

强度等级
有/无 形状 行数 列数 行间距/mm 列间距/mm 强度等级
DH1 无 - - - - - - C25 C25 - HRB335
DH2 有 正方体 2 2 2250 900 C30 C25 C25 - HRB335
DH3 有 正方体 4 4 300 750 C30 C25 C25 - HRB335
DH4 有 正方体 4 8 300 320 C30 C25 C25 - HRB335
DH5 有 正方体 4 10 300 120 C30 C25 C25 - HRB335
XJ1 - - - - - - - - - C25 HRB335

Fig.6

Comparison among load-deformation curves of slabs"

Fig. 7

Comparison of mid-deformation diagram among slabs"

Fig.8

Load-deformation curves of cast-in-place slab and laminated one"

Fig.9

Stress and displacement nephogram of cast-in-place slab and laminated one when concrete is cracked"

Fig.10

Stress and displacement nephogram of cast-in-place slab and laminated one when steel is yield"

Fig.11

Schematic diagram of shear stress direction of element"

Fig.12

Shear keys number in 1/4 area of thelaminated slab（DH4）"

Fig.13

Load-shear curves of each shear key of laminated slab（DH4）"

Fig.14

Load-shear curves of each shear key of laminated slab（DH4-1）"

Fig.15

Load-shear curves of each shear key of laminated slab（DH4-2）"

Table 2

Parameter information and simulation results of laminated slabs"

叠合板编号 抗剪键

现浇层

强度等级

钢筋

强度等级

 叠合板厚度/mm dki /m Vki/kN

V max ki

/kN

 R 1 R 2
编号 行间距/mm 列间距/mm

强度

等级
DH4 K1 300 320 C30 C25 HRB335 100 0.08 -3.74 -6.05 3.31 1.00
K2 300 320 C30 C25 HRB335 100 0.40 -2.35 -3.21 2.08 0.53
K3 300 320 C30 C25 HRB335 100 0.72 -1.53 -1.68 1.35 0.28
K4 300 320 C30 C25 HRB335 100 1.04 -1.13 -1.13 1.00 0.17
DH4-1 K1 300 250 C30 C25 HRB335 100 0.08 -3.54 -5.89 3.51 1.00
K2 300 250 C30 C25 HRB335 100 0.33 -2.45 -3.66 2.43 0.61
K3 300 250 C30 C25 HRB335 100 0.58 -2.06 -2.75 2.04 0.47
K4 300 250 C30 C25 HRB335 100 0.83 -1.35 -1.55 1.34 0.26
K5 300 250 C30 C25 HRB335 100 1.08 -1.01 -1.01 1.00 0.17
DH4-2 K1 300 450 C30 C25 HRB335 100 0.08 -3.98 -6.33 2.97 1.00
K2 300 450 C30 C25 HRB335 100 0.53 -2.38 -2.83 1.78 0.45
K3 300 450 C30 C25 HRB335 100 0.98 -1.34 -1.34 1.00 0.21
DH6 K1 900 320 C30 C25 HRB335 100 0.08 -4.01 -6.29 3.31 1.00
K2 900 320 C30 C25 HRB335 100 0.40 -2.51 -3.39 2.07 0.52
K3 900 320 C30 C25 HRB335 100 0.72 -1.62 -1.77 1.34 0.28
K4 900 320 C30 C25 HRB335 100 1.04 -1.21 -1.21 1.00 0.18
DH7 K1 180 320 C30 C25 HRB335 100 0.08 -3.58 -5.92 3.31 1.00
K2 180 320 C30 C25 HRB335 100 0.40 -2.24 -3.08 2.07 0.52
K3 180 320 C30 C25 HRB335 100 0.72 -1.47 -1.59 1.36 0.27
K4 180 320 C30 C25 HRB335 100 1.04 -1.08 -1.08 1.00 0.18
DH8 K1 300 320 C30 C25 HRB335 120 0.08 -3.11 -5.62 3.32 1.00
K2 300 320 C30 C25 HRB335 120 0.40 -1.92 -2.97 2.07 0.52
K3 300 320 C30 C25 HRB335 120 0.72 -1.33 -1.52 1.36 0.27
K4 300 320 C30 C25 HRB335 120 1.04 -0.98 -0.98 1.00 0.18
DH9 K1 300 320 C30 C25 HRB335 140 0.08 -3.07 -5.34 3.31 1.00
K2 300 320 C30 C25 HRB335 140 0.40 -1.93 -2.79 2.09 0.52
K3 300 320 C30 C25 HRB335 140 0.72 -1.24 -1.13 1.35 0.28
K4 300 320 C30 C25 HRB335 140 1.04 -0.92 -0.92 1.00 0.17
DH10 K1 300 320 C20 C25 HRB335 100 0.08 -3.88 -6.17 3.31 1.00
K2 300 320 C20 C25 HRB335 100 0.40 -2.39 -3.27 2.07 0.52
K3 300 320 C20 C25 HRB335 100 0.72 -1.58 -1.72 1.35 0.27
K4 300 320 C20 C25 HRB335 100 1.04 -1.17 -1.17 1.00 0.17
DH11 K1 300 320 C40 C25 HRB335 100 0.08 -3.69 -5.93 3.32 1.00
K2 300 320 C40 C25 HRB335 100 0.40 -2.31 -3.15 2.09 0.53
K3 300 320 C40 C25 HRB335 100 0.72 -1.49 -1.64 1.36 0.28
K4 300 320 C40 C25 HRB335 100 1.04 -1.09 -1.09 1.00 0.18
DH12 K1 300 320 C30 C20 HRB335 100 0.08 -3.85 -6.13 3.31 1.00
K2 300 320 C30 C20 HRB335 100 0.40 -2.38 -3.26 2.07 0.53
K3 300 320 C30 C20 HRB335 100 0.72 -1.56 -1.71 1.34 0.27
K4 300 320 C30 C20 HRB335 100 1.04 -1.16 -1.16 1.00 0.17
DH13 K1 300 320 C30 C35 HRB335 100 0.08 -3.71 -5.97 3.32 1.00
K2 300 320 C30 C35 HRB335 100 0.40 -2.32 -3.17 2.09 0.53
K3 300 320 C30 C35 HRB335 100 0.72 -1.49 -1.65 1.34 0.28
K4 300 320 C30 C35 HRB335 100 1.04 -1.11 -1.11 1.00 0.18
DH14 K1 300 320 C30 C25 HPB300 100 0.08 -3.93 -6.16 3.32 1.00
K2 300 320 C30 C25 HPB300 100 0.40 -2.45 -3.29 2.07 0.53
K3 300 320 C30 C25 HPB300 100 0.72 -1.56 -1.74 1.36 0.28
K4 300 320 C30 C25 HPB300 100 1.04 -1.19 -1.19 1.00 0.18
DH15 K1 300 320 C30 C25 HRB400 100 0.08 -3.55 -5.97 3.32 1.00
K2 300 320 C30 C25 HRB400 100 0.40 -2.21 -3.17 2.07 0.53
K3 300 320 C30 C25 HRB400 100 0.72 -1.49 -1.65 1.36 0.27
K4 300 320 C30 C25 HRB400 100 1.04 -1.07 -1.07 1.00 0.17

Fig.16

Regression curves of correction coefficient of K 1 and K 2 "

Table 3

Comparison between results from finite element simulation and simplified calculation formula"

叠合板编号 抗剪键编号 抗剪键行间距/mm 抗剪键列间距/mm d/m 模拟V 简化计算V 误差/% 模拟V max 简化计算V max 误差/%
YZ1 K1 300 282 0.08 -3.72 -3.58 3.8 -6.13 -5.92 3.5
K2 300 282 0.36 -2.49 -2.43 2.4 -3.61 -3.68 1.9
K3 300 282 0.64 -1.57 -1.64 4.3 -2.03 -2.13 4.7
K4 300 282 0.92 -1.15 -1.19 3.4 -1.29 -1.33 3.0
YZ2 K1 300 375 0.08 -3.88 -3.79 4.9 -6.29 -6.14 2.6
K2 300 375 0.46 -2.21 -2.24 1.3 -3.04 -3.16 3.8
K3 300 375 0.84 -1.31 -1.36 3.7 -1.54 -1.49 3.2

Table 4

Yield moment and ratio of laminated slabs and cast-in-place slab"

叠合板编号 DH4 DH4-1 DH4-2 DH6 DH7 DH8 DH9 DH10 DH11 DH12 DH13 DH14 DH15
M DH/(kN·m) 5.92 5.98 5.79 5.37 6.11 6.59 7.65 5.91 5.91 5.92 5.91 5.92 5.92
M XJ/(kN·m) 6.17 6.17 6.17 6.17 6.17 6.86 7.97 6.17 6.17 6.17 6.17 6.17 6.17
R 0.96 0.97 0.94 0.87 0.99 0.96 0.96 0.96 0.96 0.96 0.96 0.96 0.96

Fig.17

Curve of shear keys number in unit area and R "

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