RESISTING PERFORMANCE AND FRACTUAL BEHAVIOR BY SILL EMBEDMENT DURING EARTHQUAKES

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  • AKIMOTO Sho
    (Former) Grad. Stud., Graduate School of Engineering, Shinshu University
  • ISODA Hiroshi
    Prof., RISH, Kyoto University / Visiting Researcher, BRI, Dr.Eng.
  • MATSUDA Masahiro
    Assist. Prof., Faculty of Eng., Shinshu University, Dr.Eng.
  • TSUCHIMOTO Takahiro
    Chief Research Engineer, Dept. of Building Materials and Components, Building Research Institute, Dr.Agr.

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Other Title
  • 地震力により部分圧縮を受ける土台の抵抗能力と破壊性状
  • ジシンリョク ニ ヨリ ブブン アッシュク オ ウケル ドダイ ノ テイコウ ノウリョク ト ハカイ セイジョウ

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Abstract

 Characteristic of partial compression perpendicular to the grain is known as having a high ductility comparing with compression parallel to the grain, bending and tension. Experimental and theoretical studies have been carried out to evaluate strength and stiffness and consider the structural design. The current strength value is derived from the experimental study. It is difficult to define the strength directly in the compression perpendicular to the grain due to hardening in the final stage of compression test. The strength is defined as the 1.5 time of yield strength of the tests. As the results of the behavior of normal partial compression, confirmation to the partial compression can be ignored in the in the allowable stress design for wooden house. But we don't have enough data for them in the severe compression and when displacement is given to the specimen until 20mm in the condition of standard testing method, the strength of 1.5 times of yield strength is not always obtain from the test. To avoid the damage during moderate earthquake, the limit of strength is also required.<br> In this study, many partial compression tests under large deformation were conducted to grasp the damage and safety limit and to evaluate the strength value. The specimen consists of full surface, edge part and center part compression of the sill with/without column and so on. The shaking table tests were also conducted to confirm the damage and safety limit. Results of these static and dynamic loading tests are summarized as follows;<br> <br> 1) The strength obtained from all material tests is satisfied with the strength value in accordance with Japanese Building Standard Law, but the strength in a few of full surface compression dropped the load after the given deformation of 60mm.<br> 2) Safety capacity for supporting vertical load is confirmed under more than strength value in the shaking test. Safety limit deformation is proposed around 20mm and it is 1.16-1.82 time of timber and 1.40 to 2.34 times of glulam in the current strength.

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