国产杉木不同层板厚度对正交胶合木力学性能的影响

doi:10.11707/j.1001-7488.20201118

Abstract

Abstract:

Objective: This research was implemented to study the influences of different laminate thicknesses of Chinese fir (Cunninghamia lanceolata) on the mechanical properties of cross-laminated timber (CLT), and to expand the application range of Chinese fir in the field of wood structure construction and further promote the development of CLT in China. Method: Under the premise that the overall thickness of the domestic Chinese fir CLT remains unchanged, the effects of different layer thicknesses on the CLT bending and shearing properties were studied. Combined with the bending test results, the existing CLT statics analysis theory was used to perform the above tests on the CLT specimens. The bending performances under different conditions were also calculated and compared. Result: Under the premise of an unchanging total thickness, bending stiffness of the three-layer CLT specimens was the highest, and the five-layer and seven-layer specimens were reduced by 11% and 18%, respectively. The bending strength of the five-layer CLT specimens was increased by 18% compared with the three-layer specimens, which was 36% higher than that of the seven-layer specimens. The shear strength of the five-layer specimens and the seven-layer specimens was increased by 2.6% and 16%, respectively, over the three-layer specimens. The trend of the theoretical analysis of the bending stiffness was the same as the test results, however, the theoretical analysis of the bending strength showed that the higher the number of layers, the higher the value, the test results showed that the five layers were better than the seven layers. When the five-layer specimens was taken as an example, under the premise of overall thickness unchanged, increasing odd and even layer thickness ratio could effectively improve the bending and shear properties of CLT specimens in a certain percentage range. Theoretical analysis had the same trend as the experimental results. Conclusion: The results showed that under the premise of overall thickness unchanged, the thicker the CLT laminated, the better the bending stiffness was, the worse the shear properties presented, and the single failure mode was. The 5-layer CLT specimen had the best bending strength; within a certain ratio range, increasing the ratio of odd and even layer thickness could effectively improve the bending and shear resistance of the CLT specimen.

Key words: Chinese fir, cross-laminated timber(CLT), laminate thickness, mechanical properties

CLC Number:

TU366.2

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.

Figures/Tables 13

Table 1

Table 2

Table 3

Fig.1

Fig.2

Fig.3

Fig.4

Table 4

Fig.5

Fig.6

Table 5

Fig.7

Fig.8

References 0

	董惟群, 王志强. 正交胶合木及其滚动剪切性能研究现状. 山东林业科技, 2016, 46 (4): 99- 103, 93.
	Dong W Q , Wang Z Q . Development and research of cross-laminated timber and rolling shear properties. Shandong Forestry Science and Technology, 2016, 46 (4): 99- 103, 93.
	龚迎春. 国产日本落叶松正交胶合木制备工艺及力学性能评价. 北京:中国林业科学研究院博士学位论文, 2017,
	Gong Y C . Preparation and mechanical performance of cross-laminated timber made from Larix kaempferi domestically. Beijing:PhD thesis of Chinese Academy of Forestry, 2017,
	郭飞燕. 速生杉木改性及其结构胶合板的设计与制造. 南京:南京林业大学硕士学位论文, 2007,
	Guo F Y . Modification of fast-growing Chinese fir and design and fabrication of structural plywood. Nanjing:MS thesis of Nanjing Forestry University, 2017,
	阙泽利, 李哲瑞, 姜桂超, 等. 交叉层积材(CLT)的开发应用及发展前景. 木材工业, 2015, 29 (6): 22- 26.
	Que Z L , Li Z R , Jiang G C , et al. Review of research and development of cross-laminated timber. China Wood Industry, 2015, 29 (6): 22- 26.
	阙泽利, 李哲瑞, 王菲彬, 等. 中高层木结构用正交胶合木(CLT)在欧洲的研究与发展现状. 建筑结构, 2017, 47 (2): 75- 80, 27.
	Que Z L , Li Z R , Wang F B , et al. Review of research and development status of cross-laminated timber used by medium high-rise structure in Europe. Building Structure, 2017, 47 (2): 75- 80, 27.
	王俊鸿, 吴鹏飞, 周丽丽, 等. 杉木人工林生物量和生产力研究进展. 河北北方学院学报, 2014, 30 (3): 36- 40.
	Wang J H , Wu P F , Zhou L L , et al. Research progress on biomass and productivity of Chinese fir plantation. Journal of Hebei North University, 2014, 30 (3): 36- 40.
	Cao Y , Wang Y L , Wang Z , et al. Application and research progress of overseas cross-laminated timber (CLT) construction. China Forest Products Industry, 2016, 43 (12): 3- 7.
	Frangi A , Fontana M , Hugi E , et al. Experimental analysis of cross-laminated timber panels in fire. Fire Safety, 2019, 44 (8): 1078- 1087.
	Hashemi A , Zarnani P , Mashoudnia R , et al. Experimental testing of rocking cross-laminated timber walls with resilient slip friction joints. Journal of Structural Engineering, 2018, 144 (1): 04017180-1- 16.
	Knorz M , Torno S , Kuilen J W . Bonding quality of industrially produced cross-laminated timber (CLT) as determined in delamination tests. Construction and Building Materials, 2017, 133, 219- 225.
	Park H M , Fushitani M , Sato K , et al. Static bending strength performances of cross-laminated woods made with five species. Journal of Wood Science, 2003, 49 (5): 411- 417. doi: 10.1007/s10086-002-0502-x
	Schneider J , Shen Y , Stiemer S F , et al. Assessment and comparison of experimental and numerical model studies of cross-laminated timber mechanical connections under cyclic loading. Construction and Building Materials, 2015, 77, 197- 212.
	Zhou Q , Gong M , Chui Y H , et al. Measurement of rolling shear modulus and strength of cross laminated timber fabricated with black spruce. Construction and Building Materials, 2014, 64, 379- 386.

性能 Property		测试值 Measured value/MPa	标准差 Standard deviation(%)	变异系数 Coefficient of variation(%)
顺纹抗压强度Compressive strength of parallel to grain		28.3	2.8	14.9
抗弯强度Bending strength		50.8	3.2	16.9
顺纹弹性模量Elastic modulus parallel to grain		7 600	3.1	18.1
横纹弹性模量Elastic modulus perpendicular to grain		262	2.1	12.5
顺纹剪切强度 Shear strength parallel to grain	径面Radial surface	4.9	3.4	14.7
顺纹剪切强度 Shear strength parallel to grain	弦面Chord surface	5.4	2.7	15.6

试件结构 Structure	层板厚度 Thickness of the laminates/mm
3层Three layers	31.7
5层Five layers	19.0
7层Seven layers	13.6

奇数层层板厚度 Odd layer thickness/mm	偶数层层板厚度 Even layer thickness/mm	奇偶层层板厚度比 Odd to even layer thickness ratio
19	19	1.0
21	14	1.5
23	12	1.9

试件编号 No.	层板厚度 Laminate thickness/mm	抗弯刚度 Bending stiffness/(10¹¹N·mm²)	平均值 Mean/(10¹¹N·mm²)	抗弯强度 Bending strength/MPa	平均值 Mean/MPa	抗剪强度 Shear strength/MPa	平均值 Mean/MPa
A-3-1	31.7	1.10	1.14 (1.20)	33	29.7 (48.96)	5.10	5.48
A-3-2		1.14		29		5.24
A-3-3		1.19		27		6.11
A-5-1	19.0	1.17	1.08 (1.05)	35	35.0 (40.03)	5.51	5.62
A-5-2		1.05		33		5.24
A-5-3		1.02		37		6.11
A-7-1	13.6	0.94	1.00 (1.04)	29	25.7 (36.73)	6.71	6.39
A-7-2		0.96		26		6.34
A-7-3		1.10		22		6.11

试件编号 No.	比例 Ratio	抗弯刚度 Bending stiffness/ (10¹¹N·mm²)	平均值 Mean/ (10¹¹N·mm²)	抗弯强度 Bending strength/MPa	平均值 Mean/MPa	抗剪强度 Shear strength/MPa	平均值 Mean/MPa
B-1-1	(1.0)	1.16	(1.30)	35	(40.7)	5.31	5.30
B-1-2	1.0	1.22	1.19	33	32	5.28
B-1-3	(1.2)	1.19	(1.35)	29	(42)	5.32
B-2-1	(1.4)	1.25	(1.39)	35	(43.4)	5.53	5.62
B-2-2	1.5	1.22	1.23	34	35	5.75
B-2-3	(1.7)	1.23	(1.43)	37	(44.6)	5.57
B-3-1	(2.1)	1.27	(1.47)	33	(45.7)	5.91	5.94
B-3-2	19.0	1.22	1.24	38	36	5.78
B-3-3	(2.7)	1.24	(1.50)	37	(46.7)	6.12

Effect of Different Laminate Thickness on Mechanical Properties of Cross-Laminated Timber Made from Chinese Fir

RichHTML

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 13

References 0

Related Articles 15

Recommended Articles

Metrics

Comments

[1]	Yanhe Liu,Jianbo Zhou,Wansi Fu,Bin Zhang,Feihu Chang,Wen He. Preparation and Mechanical Property Evaluation of Glued Laminated Bamboo Based on High Frequency Heating [J]. Scientia Silvae Sinicae, 2020, 56(8): 131-140.
[2]	Yifan Chen,Xiaoli Fu,Huimin Wang,Xiaoqin Dai,Liang Kou,Fusheng Chen,Wensheng Bu. Effects of Understory Removal on Growth Rate of Middle-Aged Chinese Fir with Different DBH Classes [J]. Scientia Silvae Sinicae, 2020, 56(11): 21-30.
[3]	Ju Yuanhua, Ma Xiangqing, Guo Linfei, Ma Yuanfan, Cai Qijun, Guo Futao. Characteristics of Pollutants Released by Combustion of Chinese Fir Litterfall and PM_2.5 Composition Analysis [J]. Scientia Silvae Sinicae, 2019, 55(7): 187-196.
[4]	Wang Chaoqun, Jiao Ruzhen, Dong Yuhong, Hou Lingyu, Zhao Jingjing, Zhao Shirong. Differences in Metabolic Functions of Soil Microbial Communities of Chinese Fir Plantations of Different Ages [J]. Scientia Silvae Sinicae, 2019, 55(5): 36-45.
[5]	Xu Xuelei, Sun Yujun, Zhou Hua, Zhang Peng, Hu Yang, Wang Xinjie. Effects of Thinning Intensity on Understory Growth and Soil Properties in Chinese fir Plantation [J]. Scientia Silvae Sinicae, 2019, 55(3): 1-12.
[6]	Zhang Xiongqing, Wang Hanchen, Lu Lele, Chen Chuansong, Duan Aiguo, Zhang Jianguo. Tree Mortality in Relation to Planting Density, Competition and Climate Factors for Chinese Fir Plantation in Southern China [J]. Scientia Silvae Sinicae, 2019, 55(3): 72-78.
[7]	An Shengnan, Ma Xiaojun, Zhu Lizhi. Preparation and Characterization of the P34HB Composite Reinforced by Wood Flour [J]. Scientia Silvae Sinicae, 2019, 55(3): 125-133.
[8]	Anxin Li,Jianxiong Lü,Jiali Jiang. The Viscoelasticity of Chinese Fir Earlywood in Individual Growth Rings [J]. Scientia Silvae Sinicae, 2019, 55(12): 93-100.
[9]	Guijuan Yang,Haifan Hu,Honggang Sun,Jianguo Zhang,Aiguo Duan. The Influences of Stand Age, Planting Density and Self-Thinning on Relationship between Size Inequality and Periodic Annual Increment in Chinese Fir (Cunninghamia lanceolata)Plantations [J]. Scientia Silvae Sinicae, 2019, 55(11): 126-136.
[10]	Sun Xiaoting, Chang Liang, Tang Qiheng, Ren Yiping, Guo Wenjing. Effects of Isothermal Crystallization on the Properties of Wood Fiber/PLA Composites [J]. Scientia Silvae Sinicae, 2018, 54(3): 97-107.
[11]	Zhou Xianwu, Gao Yulei, Su Minglei, Zhao Rongjun, Lü Jianxiong. Progress of Research on Improvement of Genetic Engineering to Wood Properties [J]. Scientia Silvae Sinicae, 2018, 54(3): 152-160.
[12]	Liu Cangwei, Su Minglei, Wang Siqun, Wang Xinzhou, Zhao Rongjun, Ren Haiqing, Wang Yurong. Cell Wall Mechanical Properties and Microfibril Angle of Phyllostachys edulis in Different Growth Period [J]. Scientia Silvae Sinicae, 2018, 54(1): 174-180.
[13]	Zhan Tianyi, Lü Jianxiong, Zhang Haiyang, Jiang Jiali, Peng Hui, Chang Jianmin. Changes of Time Dependent Viscoelasticity of Chinese Fir Wood and Its Frequency-Dependency during Moisture Desorption Processes [J]. Scientia Silvae Sinicae, 2017, 53(8): 155-162.
[14]	Zhou Chuifan, Lin Jingwen, Li Ying, Liu Aiqin. Effect of Glyphosate Residues in Soil on Physiological Characteristics and Nutrient Absorption of Chinese fir Seedlings [J]. Scientia Silvae Sinicae, 2017, 53(4): 56-64.
[15]	Cui Lingjun, Zhang Xiongqing, Duan Aiguo, Zhang Jianguo. A Hierarchical Bayesian Model to Predict Maximum-Size Density Line for Chinese Fir Plantation in Southern China [J]. Scientia Silvae Sinicae, 2016, 52(9): 95-102.