| 摘要 |
PROBLEM TO BE SOLVED: To provide a composite beam assembly material which is free from any trouble encountered in nailing operation and adequately displays its improved effects of bending performance with a steel material or steel sheet. SOLUTION: In a composite beam assembly material for a residential building obtained by embedding and bonding a steel bar 11 (or a steel sheet) into an interstice between the layers of a wooden lamina 10, the steel material 11 (steel sheet) is combined with the inner sides of the lamina 10 positioned at the top and the bottom in the thickness direction. In addition, the lamina 10 used as an outer layer A which is 1/8 the thickness of the beam material from its upper and lower face, is set to 85×10<3> kgf/cm<2> or more in terms of Young's modulus in flexture. Further, the Young's modulus in flexture of the lamina 10 used as an intermediate layer B which is 1/8 the thickness of the inner beam material from the outer layer A is set to 75×10<3> kfg/cm<2> or more and that of the lamina 10 used as an inner layer C which is 1/2 the thickness of the inner beam material from the intermediate layer B is 65×10<3> kfg/cm<2> or more.
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