近代木造建築における筋かいと木ずり漆喰を併用した耐力壁の破壊特性と耐力発現機構に関する一考察

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  • EXPERIMENTAL STUDY ON LATERAL PERFORMANCE OF SHEAR WALL OF MODERN TIMBER ARCHITECTURE COMBINED WITH BRACE AND PLASTER USING WOOD LATH
  • キンダイ モクゾウ ケンチク ニ オケル スジカイ ト キズリ シックイ オ ヘイヨウ シタ タイリョクヘキ ノ ハカイ トクセイ ト タイリョク ハツゲン キコウ ニ カンスル イチ コウサツ

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 In this study, in-plane shear tests of the seismic shear walls of modern timber architecture combined with brace and plaster using wood lath were conducted, and the failure mode, deformation performance and strength properties were discussed.<br> The specimens are shown in Fig. 1 and Table1. Two types of the steel plate are used for the joints of the brace (see Fig. 2 and Fig. 3). Specimen1 is the wall using the only brace with the joint steel plate as shown in the existing architecture. Specimen2 is the wall using the only brace with the reinforced steel plate in joint. Specimen3 is the only plaster wall using wood lath. Specimen4 is the wall combined with brace (existing joint steel plate) and plaster using wood lath. Specimen5 is the wall combined with brace (reinforced steel plate) and plaster using wood lath.<br> The results obtained from this study are summarized as follows.<br> In the Specimen1, the joint steel plates were rotated in the early drift angle (see Photo3), and axial force were not acted on the tensile brace. At the drift angle of 1/30rad, the beam was broken (see Photo4) by bending moment because the compressive brace pushed up the beam.<br> In the Specimen2, the strength properties were dramatically improved (see Fig. 8) because of the reinforced steel plate in joint. However, the bending fracture of the beam, which is the same as shown in Specimen1, occurred at the drift angle of 1/50rad.<br> In the Specimen3, many cracks occurred at the corner of the plaster because of compressive stress (see Fig. 11). The strength of the plaster was the highest at the drift angle of 1/100rad, and the load decreased rapidly after that of 1/100rad. However, the load increased again after that of 1/50rad because wood lath was contacted with columns (see Fig. 10).<br> In the Specimen4, the diagonal crack in the central area of plaster occurred in first, and then the crack at the corner of the plaster occurred (see Fig. 13). However, the number of the cracks at the drift angle of 1/100rad was lower than that of Specimen3.<br> In the Specimen5, the cracks at the corner of the plaster occurred at the drift angle of 1/75rad (see Fig. 15). It is considered that the compressive stress will decrease by increasing the stiffness of the brace.<br> The strength of the walls combined with brace and plaster shows good agreement with the sum of each strength of brace and plaster using wood lath.

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