Seiichiro Ukyo
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View article: Derivation of the shear modulus on the adhesive layer measured by digital image correlation: study on the tensile shear tests of wood-based materials with veneer
Derivation of the shear modulus on the adhesive layer measured by digital image correlation: study on the tensile shear tests of wood-based materials with veneer Open
In this study, peeling veneers of Japanese cedar and Japanese larch were parallel or cross laminated, respectively, and tensile shear tests were conducted. As a result, for Japanese cedar veneers, significant difference in shear strength w…
View article: Shear strength properties of hybrid (hinoki cypress and Japanese cedar) cross-laminated timber
Shear strength properties of hybrid (hinoki cypress and Japanese cedar) cross-laminated timber Open
In this study, the out-of-plane shear strength of hybrid cross-laminated timber (CLT) with outer layers of hinoki (hinoki cypress, Chamaecyparis obtusa ) and inner layers of sugi (Japanese cedar, Cryptomeria japonica ) is investigated for …
View article: STUDY ON IN-PLANE PERFORMANCE OF CLT DIAPHRAGM CONNECTED WITH METAL PLATE AND SPLINE
STUDY ON IN-PLANE PERFORMANCE OF CLT DIAPHRAGM CONNECTED WITH METAL PLATE AND SPLINE Open
Diaphragm need to have high in-plane strength and stiffness of shear walls to perform in structure. However, it is difficult to regard timber diaphragm as rigid due to characteristics of timber structures. Considering this background, ther…
View article: Evaluation of rolling shear modulus and strength of Japanese cedar cross-laminated timber (CLT) laminae
Evaluation of rolling shear modulus and strength of Japanese cedar cross-laminated timber (CLT) laminae Open
Cross-laminated timber (CLT) panels are fabricated with their layers stacked crosswise. Owing to the low shear modulus and strength in the rolling shear direction, the shear properties of cross-layers influence the overall deflection and s…
View article: Relationship between the Vertical Load Properties of Floors and Human Sensory Evaluations of Walking Vibration in Wooden Schools and Offices II.
Relationship between the Vertical Load Properties of Floors and Human Sensory Evaluations of Walking Vibration in Wooden Schools and Offices II. Open
歩行を加振源とする床の鉛直振動と感覚評価との関係の検討を行い，床の応答加速度と知覚確率，鉛直方向の周波数重み付け加速度レベルとアンケート調査結果および床のたわみ，固有振動数との関係を調べた。床の応答加速度の値3～4cm/s2を上回ると，アンケートで振動を「感じない」と答えた人以外の割合が100％，また，鉛直方向の周波数重み付け加速度レベルが65dBを下回ると，歩行振動を許容できる人の割合が65％以上となった。本研究では歩行振動に対する木造大スパン床の設計目標を提案できる可能…
View article: Relationship between Vertical Load Properties of Floors and Human Sensory Evaluation of Walking Vibration in Wooden Schools and Offices I.
Relationship between Vertical Load Properties of Floors and Human Sensory Evaluation of Walking Vibration in Wooden Schools and Offices I. Open
大スパン床における静的および振動性状を測定することを目的に，4つの木造校舎および2つの木造事務所の床を測定対象として，静的たわみおよび振動の実測を行い，曲げ剛性ならびに固有振動数，減衰比の算定を行った。設計上の床の初期たわみはスパンの約1/430～1/1100，クリープを考慮した床のたわみはスパンの約1/280～1/800であり，1つの小学校を除いていずれもたわみ制限値を下回っていた。また，梁または平行弦トラスの曲げ剛性の実験値は設計値より1.1～3.9倍大きかった。さらに…