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- 저자 : ( Masahiro Inayama ) (검색결과 2 건)
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< 전시-P-31 > Experimental Study of Partial Compressive Strength to Lateral Face of CLT
( Marina Totsuka ),( Kenji Aoki ),( Masahiro Inayama ) 한국목재공학회 2019 한국목재공학회 학술발표논문집 Vol.2019 No.1
Partial compressive properties to lateral face in Cross Laminated Timber (CLT) is important when we calculate a criteria of connections. However, the technical knowledge of studies on compression behavior of lateral face in CLT is still limited. In this study, we cleared the partial compressive properties, yield strength and initial and secondary stiffness, to lateral face by compression tests of CLT which are made of Japanese cedar. There were 24 types of specimens which have variety in width of an applied loading devices, location of applied loading devices, with or without edge bonds and side margins. As a result of experiments, the width of the applied loading device and the side margin have potent influence on the compressive yield strength and initial and secondary stiffness. It is assumed that the influence by the width of the applied loading device is size effect. The effect gets bigger when the width of the loading plates decreases. Also the side margin effect gets bigger when the width of the loading plates decreases. Additionally, the specimen which has over 100mm in side margin can be considered with infinite length. On the other hand, the perimeters of location of applied loading devices and with or without edge bonds has not potent influence on the compressive yield strength and initial and secondary stiffness.
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( Kenji Aoki ),( Akihiko Miyake ),( Hiro Kawahara ),( Masahiro Inayama ) 한국목재공학회 2019 한국목재공학회 학술발표논문집 Vol.2019 No.1
In Japan, referenced shear strength of glued-laminated timber is specified in MLIT (Ministry of Land, Infrastructure, Transport and Tourism) Notification No. 1024 in 2001, and there is a difference of strength depending on the direction of stress acting on the material. According to the current Japanese building code, the shear strength in the width direction is set to a small value of 0.78 to 0.88 times to that in the lamination direction. However, there is no technical basis at the time when the standard was established, so early verification and improvement are demanded from researchers and engineers of wooden structure. In this research, three-point bending test, full-scale block shear test and JIS (Japanese Industrial Standard) block shear test on glued-laminated timber were conducted. The glued-laminated timber was made of Japanese cedar, Japanese cypress, Scots pine and Douglas fir. Comparing the average value of the shear strength obtained by each test method, it was found that the shear strength in the width direction has the same or higher value than the lamination direction, and there is no tendency like the current building code. Comparing each test method, it was found that different characteristic values were obtained due to influence of size effect and notch effect.
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