斜螺钉2种角度不同组合形式对钢板-正交胶合木剪切性能的影响

doi:10.11707/j.1001-7488.20220317

Abstract

Abstract:

Objective: This study was implemented to make a kind of steel-to-cross-laminated timber joint connected by self-tapping screws, and to explore the influences of different combinations on the mechanical properties of the joint. Based on the comparison between the existing theoretical models and the experimental values, the calculation model was optimized. Method: Six groups of shear tests with different combinations were carried out for self-tapping screws with angles of 45° and 90° by changing the screw tapping angles and combination forms, and loaded at a uniform speed of 1 mm·min^-1 according to the American standard ASTM D1761-12. The failure modes of the joints subjected to shear were recorded and analyzed, and the load-displacement curves, load-carrying capacity, stiffness and energy dissipation of each specimen were compared. Result: The main failure modes of the specimens were two screws cut off at the same time, the screws not cut off but plastic hinges produced, and the screws not cut off but pulled out at the same time. For all the 6 groups, there was a failure mode in which one side of the screws were cut off. In addition, there was a failure mode in which the screws for the group J-Cross45°T and S-Double45°T were pulled out instead of being cut off, and in group S-45°T-45℃ there was a failure mode in which plastic hinges were produced instead of being cut off. In this test, the load-carrying capacity and stiffness of groups J-Cross45°T, J-Double45°T were S-Double45°T were much higher than those of groups S-45°T-45℃, S-90°-45℃ and S-90°-45°T.The displacement corresponding to energy dissipation and load-carrying capacity of group S-90°-45℃ was the maximum. Conclusion: Among the 6 groups of specimens, Group S-Double45°T might have the best comprehensive mechanical performance, while group S-90°-45℃ could be suitable for the joints with high seismic requirements in the building.

Key words: inclined self-tapping screws, steel plate, cross-laminated timber(CLT), shear capacity

CLC Number:

TU366.2

Zhiyuan Chen,Shuo Wang,Xinmeng Wang,Liuliu Zhang,Bin Zhou,Hui Huang,Zeli Que. Effects of Different Combination Forms of Inclined Self-Tapping Screws with Two Angles on Shear Performance of Steel-to-Cross-Laminated Timber[J]. Scientia Silvae Sinicae, 2022, 58(3): 159-166.

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L/ mm	d/ mm	d_L/ mm	d_K/ mm	K/ mm	抗弯屈服强度特征值 Characteristic value of yield bending strength/MPa	抗拉强度特征值 Characteristic value of tensile strength/MPa	抗拉力特征值 Characteristic value of tensile resistance/kN
140.00	6.00	4.00	8.40	5.50	1 000.0	1 100.0	13.8

指标		组A Group A	组B Group B	组C Group C	组D Group D	组E Group E	组F Group F
Index		J-Cross45°T	J-Double45°T	S-Double45°T	S-45°T-45℃	S-90°-45℃	S-90°-45°T
F_max/N	AVG	49 457.07	55 120.94	55 578.82	29 451.35	24 672.44	33 101.16
	SD	2 836.72	5 168.86	3 836.08	2 191.53	1 760.66	441.43
	COV	5.74	9.38	6.90	7.44	7.14	1.33
V_max/mm	AVG	5.21	5.17	4.35	5.48	13.376	4.08
	SD	0.54	0.77	0.42	0.98	2.50	0.89
	COV	10.32	14.92	9.6	17.88	18.69	21.91
K/(N·mm^-1)	AVG	10 126.50	10 265.52	10 173.55	5 211.56	2 156.08	6 310.93
	SD	2 066.76	2 430.33	626.98	1 235.88	251.21	714.33
	COV	20.41	23.67	6.16	23.71	11.65	11.32
Energy/J	AVG	143 766	126 661	139 209	54 944.36	203 234.2	62 265.95
	SD	21 506.12	25 053.98	42 067.94	12 934.79	47 948.82	23 816.96
	COV	14.96	19.78	30.22	23.79	23.59	38.25

组合形式 Combination forms	F_max/N	K/(N·mm^-1)	Energy/J
45°T-S	25 483.33	5 538.13	60 038.02
45℃-S	4 027.53	548.854	40 413.73
90°S	17 479.63	1 545.99	88 674.23

[1]	Qiao Li,Zhiqiang Wang,Zhijun Liang,Long Li. Flexural Behavior of Hybrid Cross-Laminated Timber Fabricated from Construction Oriented Strand Board and Spruce-Pine-Fir [J]. Scientia Silvae Sinicae, 2021, 57(11): 158-168.
[2]	Zhaohui Wang,Yangbo Lü,Beiqing Ge,Zhongli Zhang,Guannan Su,Zhaopeng Tian. Bearing Performance of Dowel Connection with Slotted-in Steel Plates in the Structural Component of Japanese Cedar under Load Perpendicular to Grain [J]. Scientia Silvae Sinicae, 2020, 56(7): 123-134.
[3]	Feibin Wang,Xinmeng Wang,Shuming Yang,Guichao Jiang,Zeli Que,Haibin Zhou. Effect of Different Laminate Thickness on Mechanical Properties of Cross-Laminated Timber Made from Chinese Fir [J]. Scientia Silvae Sinicae, 2020, 56(11): 168-175.

Effects of Different Combination Forms of Inclined Self-Tapping Screws with Two Angles on Shear Performance of Steel-to-Cross-Laminated Timber

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