人工林杨木材性对单板层积材强度的贡献率*

Abstract

Abstract:

The concept of contributivity was put forward in this paper.It can be used to measure the contribution ratio of solid wood properties to LVL strength.The contributivity of 3 poplar clones from plantation was studied and the results shows that poplar with good solid wood properties or LVL with thick veneers gives high contributivity.The average contributivity of good poplar 69, poplar 72 and poor poplar 63 is 74.34%, 67.48%and 64.72%, respectively.When LVL is assembled with the veneers of 3.565mm, 2.614mm and 1.545mm in thickness, the average contributivity is 74.00%, 67.48%and 58.06%, respectively. In addition, the contributivity of shear strength, modulus of elasticity and toughness is approximated to 80%, which is higher than that of the other 3 properties.

Key words: Poplar, Solid wood, Laminated veneer lumber(LV L), Wood property, Strength, Contributivity

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Fucheng Bao,Feng Fu. CONTRIBUTIVITY OF PLANTATION POPLAR WOOD PROPERTIES TO LVL STRENGTH[J]. Scientia Silvae Sinicae, 1999, 35(2): 87-94.

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Figures/Tables 6

Table 1

Allocation of sample logs"

Table 1

Table 2

Testing methods of poplar solid wood and LVL properties"

Table 2

Table 3

Properties of poplar solid wood and LVL from different clones"

Table 3

Table 4

Contributivity of different clone poplar solid wood properties to LVL strength"

Table 4

Table 5

Properties of poplar 72 solid wood and LVL with different thickness veneers"

Table 5

Table 6

Contributivity of poplar 72 solid wood properties to different thickness veneer LVL strength"

Table 6

References 8

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2	Hoover W L , et al. Material design factors for hardwood laminated veneer Number. Forest Prod.J, 1987. 37, 15- 23.
3	JAS协会.1991.结构用单板层积材.日本农林水产省
4	JAS协会.1989.结构用胶合板.日本农林水产省
5	中华人民共和国国家标准.1991.木材物理力学性质试验办法.GB 1927~1943~91
6	成俊卿等著.1992.中国木材志.北京:中国林业出版社.48~ 49
7	成俊卿主编.1985.木材学.北京:中国林业出版社.679~ 680
8	《高技术新材料要览》编辑委员会编.1993.高技术新材料要览.北京:中国科学技术出版社.502~ 504

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