木質壁パネルの強度性能

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概要

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• Tests were carried out to examine the influence of the construction variables on the structural performance of load-bearing wall panels used in prefabricated wooden houses. Six types of framings were constructed of spruce wood (Fig. 1), and the framing members were cut out for each section, 4. 5 by 7 cm, except for the bottom members, which were each 7 by 7cm (Fig. 2). The skin materials of 6 mm lauan plywood were jointed on both sides or on one side of the framing according to the type of the specimens. In Figs. 4, 5 and 8 the schemata of loading specimens are shown respectively. The bending tests were carried on over the span of 220 cm with the load applied at each quarter point. The racking tests were performed without installation of the tie rods as of ASTM standard. The loading was repeated with increased load till a certain specific stage was reached and still continued evenly to the failure of the material (Fig. 7). The compression tests were performed of the specimens, except specimens SR_1, with the load applied on their center line of thickness of the specimens, using the knife edges on both their ends as equipment. The specimens SR_1 were tested in accordance with ASTM standard. The results of these tests are summarized as follows : In the bending tests the ratio of the observed flexural rigidity to what was calculated is various with the arrangement of framing members, the method of plywood-timber joints and the form of stressed skin construction (Tables I, III and IV). This fact shows that the effective breadth of the skin has considerable effect on the flexural resistance of the panel. In the racking tests on glued and nail-glued specimens without opening it is shown that the racking load is little affected by the difference in the framing construction, so long as the deformation at the upper end is horizontally equal to 1/100 of the height of panel (P_<1/100> kg/m) (Table II). The racking resistance of nailed specimens is weaker than that of glued specimens (Tables II, III and Fig. 7). In the racking tests of specimens with opening the position of the opening makes larger difference to the racking resistance than the opening ratio does (Table III and Fig. 3). The glued specimens (SRC, ERD, SRG) being equipped with powerful plywood skin and reinforced frame around the opening, show but little decrease in the racking resistance. In the compression tests it is shown that the buckling load increases so far as there is increase in the vertical members of framing. The value of the buckling load calculated by Euler's formula for the pin end column, substituting the observed flexural rigidity, is in good agreement with what was observed, though with a few exceptions (Table IV)

• 社団法人日本材料学会の論文
• 1971-11-15

著者

• 山井 良三郎

  農林省林業試験場

関連論文

• アピトン材の横圧縮変形性能に就いて(林産の部)(第60回日本林學會大會並に第5回九州支部大會)
• 構造用木材の応力等級区分について(木質材料小特集)
• 木質壁パネルの強度性能
• 木材資源の現状と将来の建築技術 (建築生産の工業化をめぐる材料の問題)
• 木材の強度特性について
• 木材の圧縮異方性について
• 511. 木材の横圧縮変形性能について(第2報)(第64回日本林学会大会)(ON THE 64 th MEETING OF THE JAPANESE FORESTRY SOCIETY)
• 316. 木材の横圧縮変形性能について(1)(第63回日本林学会大会講演要旨)

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