Shear tests of timber joints composed of sugi composite glulam beams using newly developed steel connectors |
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Authors: | Tomoyuki Hayashi Masahiko Karube Kouji Harada Toshihiro Mori Tomonori Ohno Kohei Komatsu and Yasuo Lijima |
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Institution: | (1) Engineered Timber and Joints Laboratory, Forestry and Forest Products Research Institute, Kukizaki, 305-8687 Ibaraki, Japan;(2) Yamasa Mokuzai Co., Kimotuki-gun, 893-1206 Kagoshima, Japan;(3) Kuma Koiki Forest Association, Kamiukiana-gun, 791-1223 Ehime, Japan;(4) Wood Research Institute, Kyoto University, Uji, 611-0011 Kyoto, Japan;(5) Institute of Wood Technology, Akita Prefectural University, Noshiro, 016-0876 Akita, Japan |
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Abstract: | A research project supported by the Japan Wood Working Machinery Association has been conducted since 1999 to examine the feasibility of sugi (Cryptomeria japonica D. Don) composite glulam beams reinforced with Douglas fir (Pseudotsuga menziesii Franco) lamination. This study, part of the project, was concerned with the strength properties of timber joints composed of composite glulams using newly developed structural steel connectors. Two types of beam were prepared: 10 plies (inner 6 plies sugi, outer 4 plies Douglas fir) and 8 plies (inner 4 plies sugi, outer 4 plies Douglas fir). Two types of structural steel connector, Haratec and Standard, were used for joining the beam with a post or a girder. The relation between load and deformation of the joints was represented as a typical nonlinear curve. Initial stiffness and maximum load of the joint composed of the composite glulam were in the range between those of sugi and Douglas fir. Strength properties of the joints varied with three variables: type of connector, depth of the glulams, and the type of joint. Thus, the allowable loads for the connectors should be determined for each combination of these variables. |
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Keywords: | Composite glulam Timber joint Structural connector Sugi |
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