Effect of Lamina Property and Lamination Pattern on Bending Properties of Laminated Lumber Composed of Several Softwoods with the Same Modulus of Elasticity

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  • ラミナ特性や断面構成が同等の曲げヤング係数を有する異樹種異等級構成集成材の曲げ性能に及ぼす影響
  • ラミナ トクセイ ヤ ダンメン コウセイ ガ ドウトウ ノ マゲ ヤング ケイスウ オ ユウスル イジュシュイトウキュウ コウセイ シュウセイザイ ノ マゲ セイノウ ニ オヨボス エイキョウ

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In the present study, bending properties (modulus of rupture (MOR), modulus of elasticity (MOE), bending work (W), and Janka plastic modulus (Z)) were investigated for 10-ply laminated lumber composed of several softwood species. Sugi (Cryptomeria japonica D.Don) laminae were used for the inner 8 layers, and hinoki (Chamaecyparis obtusa Sieb. et Zucc.) or karamatu (Larix Kaempferi Carriere) laminae were used for the outermost 2 layers. In addition, laminated lumber members composed of 10 sugi laminae were also produced. In order to obtain the same MOE in all laminated lumber members, laminae were graded and then arranged for manufacturing the laminated lumber. Although the MOE showed almost the same value in all laminated lumber members, significant differences in MOR, W, and Z were recognized among the types of laminated lumber. In all types of laminated lumber, W and Z were mainly effected by deflection at the plastic region. In addition, W and Z were effected by the bending property of species forming the inner layers as well as that of the species forming the outermost layers.

Journal

  • Mokuzai Gakkaishi

    Mokuzai Gakkaishi 56 (3), 172-181, 2010

    The Japan Wood Research Society

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