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積層構成が異なる箱形断面CFRP梁の曲げ挙動に関する研究

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Title: 積層構成が異なる箱形断面CFRP梁の曲げ挙動に関する研究
Other Titles: FLEXURAL BEHAVIOR OF CFRP BOX BEAMS WITH DIFFERENT LAMINATE STRUCTURES
Authors: 櫻庭, 浩樹1 Browse this author
松本, 高志2 Browse this author →KAKEN DB
林川, 俊郎3 Browse this author →KAKEN DB
Authors(alt): Sakuraba, Hiroki1
Matsumoto, Takashi2
Hayashikawa, Toshiro3
Keywords: CFRP
box beam
laminate structure
stiffness
strength
flexure
Issue Date: 20-Feb-2012
Publisher: 土木学会
Journal Title: 土木学会論文集A1(構造・地震工学)
Volume: 68
Issue: 1
Start Page: 73
End Page: 87
Publisher DOI: 10.2208/jscejseee.68.73
Abstract: 本研究では,積層構成が異なる箱形断面CFRP梁の4点曲げ載荷実験を行い,積層構成の違いが梁の曲げ挙動に与える影響を明らかにすることを目的としている.本実験では,6種類の積層構成を用いて供試体を作製した.供試体は,梁軸方向:梁周方向:斜交方向(±45º,1体のみ±60º)の単層板の比率を変化させている.梁の初期剛性は2:0:1(±45º)とした供試体で最大となり,載荷条件に対して適切な梁軸方向と斜交方向の比率が重要であることを示した.梁軸方向直ひずみとせん断ひずみは,積層理論と梁理論から算出した理論値が実験値とよく一致し,積層構成の違いによる影響が明確に示された.耐荷力は早期に生じた損傷により各供試体の差が顕著ではなかったが,梁周方向よりも斜交方向の単層板を用いる方が耐荷力向上に有利であった。
The objective of this study is to investigate the flexural behavior of CFRP box beams with six different laminate structures. Those six laminates have 25 or 24 laminas, and they have the proportion of longitudinal, transverse, and diagonal laminas (±45°, except for one laminate of ±60°) as 1:1:0 (L1T1), 1:0:2 (L1D2), 1:0:1 (L1D1), 1:1:2 (L1T1D2), 2:0:1 (L2D1), and 1:0:2 (±60°) (QISO60). They were tested under four point bending. The bending tests show that L2D1 exhibits the highest stiffness, followed by L1D1, L1D2, QISO60, L1T1D2, and L1T1. The specimens show the difference of measured longitudinal normal strain and shear strain among them as they have the different lamina proportions. L2D1and L1D2 show the smallest longitudinal strain and shear strain since L2D1and L1D2 have the largest number of longitudinal laminas and diagonal laminas, respectively. In addition, the measured strains agree well with the theoretically calculated ones based on classical lamination theory and beam theory. The flexural strength increases in the case of having the diagonal laminas when compared to L1T1 which consists of the longitudinal and transverse laminas. QISO60 exhibits the highest flexural strength although all the specimens had a premature damage near loading plates.
Relation: http://www.jsce.or.jp/collection/index.html
Type: article
URI: http://hdl.handle.net/2115/51712
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松本 高志

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