In order to visualize the effect of shaped sections on the joints, and to provide some experience for the safety design of bolted timber joints with slotted-in shaped steel plates, a CFRP-bolted timber joints with slotted-in corrugated steel plates was proposed, and uniaxial paralleling tensile tests were carried out under orthogonal parametric design conditions. The tests reveal that the joints have multiple force characteristics, which mainly include the forms of timber shear damage, transverse to tension-type fracture (TL fracture), end compression crush, CFRP fracture and bolt bending. The joints have no obvious yielding stage, and mainly undergo the elastic stage, the fracture failure transition stage and the fracture failure stage. Based on the orthogonal parametric analysis, the degree and the pattern of different factors on the proposed joint were obtained. Results show that the ultimate strength and ductility are more significantly influenced by each factor than the elastic stiffness, and the wave angle and the wave height are the main factors. The ultimate strength fluctuates with the increase of the wave height and is negatively correlated with the wave angle, while the ductility is negatively correlated with the wave angle and the wave height.
Xuan GUO,Zhonggen XU,Yatao ZHAO,Danyun ZHONG. Orthogonal experimental study on mechanical properties of CFRP-bolted timber joints with slotted-in corrugated steel plates. Journal of ZheJiang University (Engineering Science), 2024, 58(4): 847-856.
Fig.1Design details of specimen for CFRP-bolted timber joints with slotted-in corrugated steel plates
因素
水平
λ/mm
35、40、45、50
h/mm
10、15、20、25
θ/(°)
48、58、68、78
t/mm
90、120、150、180
n
0、1、2、3
Tab.1Factors and levels
编号
λ/mm
h/mm
θ/(°)
t/mm
n
CSJ1
35
10
48
90
0
CSJ2
35
15
58
120
1
CSJ3
35
20
68
150
2
CSJ4
35
25
78
180
3
CSJ5
40
10
58
150
3
CSJ6
40
15
48
180
2
CSJ7
40
20
78
90
1
CSJ8
40
25
68
120
0
CSJ9
45
10
68
180
1
CSJ10
45
15
78
150
0
CSJ11
45
20
48
120
3
CSJ12
45
25
58
90
2
CSJ13
50
10
78
120
2
CSJ14
50
15
68
90
3
CSJ15
50
20
58
180
0
CSJ16
50
25
48
150
1
Tab.2Type of specimens for CFRP-bolted timber joints with slotted-in corrugated steel plates
Fig.2Experiment loading of specimen for CFRP-bolted timber joints with slotted-in corrugated steel plates
Fig.3Area division schematic
Fig.4Experiment phenomena of specimens for CFRP-bolted timber joints with slotted-in corrugated steel plates
Fig.5Simplified mode of double cantilever beam fracture
Fig.6Deformation form of bolts
失效模式
试件编号
S Ⅰ
S Ⅰ、S Ⅲ
S Ⅲ
S Ⅲ、S Ⅳ
S Ⅳ
端部承压
—
—
—
CSJ6
CSJ9
TL断裂
CSJ1、CSJ2
—
CSJ5
—
—
CFRP断裂
CSJ12
CSJ11、CSJ14
—
CSJ3、CSJ16
—
端部剪切
CSJ7、CSJ13
CSJ8
—
CSJ4、CSJ10、CSJ15
—
Tab.3Failure modes of specimens for CFRP-bolted timber joints with slotted-in corrugated steel plates and yield modes of bolts
Fig.7Load-displacement curve of specimen
Fig.8Definitions of main mechanical property parameters
试件
ke/(kN·mm?1)
Fy/kN
Δy/mm
Fmax/kN
Δu/mm
D
CSJ1
3.86(4.83)
40.78(4.63)
14.11(7.51)
46.81(6.94)
52.63(7.42)
3.73(11.59)
CSJ2
4.22(6.98)
43.22(4.01)
13.74(4.60)
52.31(3.99)
57.22(3.06)
4.17(6.62)
CSJ3
4.25(8.76)
43.88(3.27)
13.46(5.76)
50.89(2.82)
34.75(4.34)
2.58(4.59)
CSJ4
4.11(3.74)
43.00(3.76)
15.95(8.13)
54.27(6.23)
26.33(7.67)
1.65(5.18)
CSJ5
4.39(10.64)
55.95(4.59)
16.59(4.91)
66.92(3.79)
72.84(7.70)
4.39(3.55)
CSJ6
4.51(12.72)
63.20(7.09)
18.16(6.33)
74.07(7.12)
75.78(7.13)
4.29(7.05)
CSJ7
3.65(3.98)
34.22(4.80)
11.82(4.63)
43.86(5.85)
18.16(5.46)
1.53(9.40)
CSJ8
3.73(1.55)
39.23(3.64)
15.31(3.82)
47.85(4.54)
20.20(4.59)
1.32(0.93)
CSJ9
4.72(7.54)
53.78(8.68)
16.02(4.05)
62.29(7.19)
42.51(4.94)
2.65(8.28)
CSJ10
4.21(3.45)
47.92(5.95)
14.72(6.09)
54.05(3.11)
21.12(6.23)
1.43(5.56)
CSJ11
4.31(4.66)
45.83(4.04)
13.94(4.21)
57.32(3.90)
40.36(5.23)
2.90(7.28)
CSJ12
3.67(2.46)
36.15(6.75)
14.98(5.29)
45.06(4.80)
29.00(1.66)
1.93(4.02)
CSJ13
3.91(3.71)
45.13(6.34)
15.46(7.77)
47.12(7.87)
31.57(8.37)
2.04(10.40)
CSJ14
4.22(8.66)
44.77(3.46)
15.81(3.59)
50.24(4.66)
38.34(6.16)
2.42(5.02)
CSJ15
4.33(5.99)
39.96(5.15)
14.93(13.21)
44.78(8.91)
36.88(10.61)
2.48(12.79)
CSJ16
3.75(4.79)
43.48(2.14)
19.66(2.81)
51.05(4.62)
48.40(4.11)
2.46(4.92)
Tab.4Mechanical property parameters of specimens for CFRP-bolted timber joints with slotted-in corrugated steel plates
力学性能参数
因素（来源）
Q
df
MS
VS
Sig
ke
λ
0.070
3
0.023
0.254
0.048
h
2.179
3
1.060
11.494
0.002
θ
0.129
3
0.043
0.465
0.025
t
3.050
3
0.683
7.414
0.000
n
0.140
3
0.047
0.506
0.017
Fmax
λ
346.140
3
115.380
21.792
0.030
h
1060.310
3
353.437
66.755
0.000
θ
955.105
3
318.368
60.131
0.000
t
603.177
3
201.059
37.975
0.000
n
416.372
3
138.791
26.214
0.020
D
λ
5.349
3
1.783
268.445
0.000
h
14.880
3
4.960
746.823
0.000
θ
22.003
3
7.334
1104.279
0.000
t
1.574
3
0.525
78.985
0.010
n
2.424
3
0.808
121.672
0.003
ke
误差
2.950
32
0.092
—
—
Fmax
169.425
32
5.295
—
—
D
0.213
32
0.007
—
—
ke
总计
798.269
48
—
—
—
Fmax
119 369.595
48
—
—
—
D
365.434
48
—
—
—
Tab.5Variance analysis of main mechanical property parameters
Fig.9Multiple comparison of significant factors
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