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

摘要/Abstract

摘要：

目的: 制作一种采用自攻螺钉连接的钢板-正交胶合木节点, 探究螺钉不同钉入角度不同组合形式对节点力学性能的影响, 并依据现有的理论计算模型与试验值比较对计算模型进行优化, 为新型连接件的开发和应用提供理论模型和参考。方法: 参考美国标准(ASTM D1761-12)以1 mm·min^-1的速度匀速加载, 对夹角为45°和90°2种自攻螺钉钉入角度进行6种不同组合形式的抗剪试验, 记录分析受剪切节点的破坏形态并对比各组试件的荷载-位移曲线、承载力、刚度和能量耗散。结果: 试件主要破坏模式包括2颗钉同时被剪断、钉未被剪断但产生塑性铰和钉未被剪断但同时被拔出。6组试件均出现一侧钉被剪断的破坏模式, 组J-Cross45°T和S-Double45°T出现钉未被剪断而被拔出、组S-45°T-45℃出现钉未被剪断而产生塑性铰的破坏模式。组J-Cross45°T、J-Double45°T、S-Double45°T的承载力和刚度均远高于组S-45°T-45℃、S-90°-45℃、S-90°-45°T, 组S-90°-45℃的能量耗散和承载力对应位移最大。结论: 对于承载力、刚度、能量耗散和承载力对应位移4个力学性能指标, 钉尖间距影响很小, 不同角度组合影响较大。6组试件中组S-Double45°T的综合受力性能最好, 组S-90°-45℃适用于建筑中对抗震要求较高的节点。

关键词: 斜螺钉, 钢板, 正交胶合木, 剪切性能

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

中图分类号:

TU366.2

陈志渊,王硕,王昕萌,张柳柳,周斌,黄慧,阙泽利. 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[J]. 林业科学, 2022, 58(3): 159-166.

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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参考文献 0

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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

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