釘打ちされた面材大壁の面材のせん断座屈とせん断破壊を考慮したせん断設計法に関する研究

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  • STUDY ON STRUCTURAL CALCULATION METHOD OF NAILED SHEATHED SHEAR WALLS UNDER SHEAR FORCE CONSIDERING SHEAR BUCKLING AND SHEAR FAILURE OF SHEETS
  • クギウチ サレタ メンザイ オオカベ ノ メンザイ ノ センダンザクツ ト センダンハカイ オ コウリョ シタ センダンセッケイホウ ニ カンスル ケンキュウ

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 The stiffness and shear capacity of nailed sheathed shear walls are calculated by summing up the resistance force of nails assuming that sheets don't buckle and are not damaged by shear. High strength shear walls are designed based on calculation without considering the limitation of the existing formulae. The limitation of this formulae is determined in this paper based on experimental and analytical studies.<br><br> Regardless of the material type and size of sheets, the followings are experimentally confirmed.<br><br> 1) The critical shear buckling stress increases as the amount of nails onto sheets increases as shown in Fig. 3, because the boundary condition changes from simply-supported edges to clumped supported edges of sheets.<br><br> 2) The shear strength of sheets decreases when sheets buckle in an early stage as shown in Fig. 4, because ununiformed shear stress in sheets distributes due to the deformation of shear buckling.<br><br> 3) The maximum nailing pitch on a sheet to be attached to a stud for stiffening against shear buckling is N50-@300mm which is obtained by FEM eigenvalue analyses as shown in Fig. 8.<br><br> 4) The critical shear buckling stress of sheathed shear walls stiffening with studs are estimated to be 2τcrp as shown in Table 4, where “τcrp” is the critical shear buckling stress of no stiffening sheathed shear walls with simply-supported edges.<br><br> 5) The formulae to calculate the value of “τcrp” is presented by regression analysis from the calculation chart in Fig. 11.<br><br> 6) The formulae to determine the limitation of the calculation method to design high strength shear walls are presented in Eqs.(3)-(5).<br><br> 7) The quick reference table for plywood sheets are presented in Table 5, eliminating the need of examining the shear buckling.

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