短繊維補強コンクリート（構造）Ⅱ／新材料・新工法（構造）／補修・補強（構造）Ⅰ

[2198] Behaviors of Pretensioned PC Beams Strengthened in Shear Using Externally Bonded CFRP Sheets

座長(土木)：栗橋祐介
座長(建築)：金久保利之
講演者：Thi Thu Dung NGUYEN¹, 松本浩嗣², 山田雅彦³, 二羽淳一郎² (1.Tokyo Institute of Technology, Civil Engineering 2.東京工業大学Civil Engineering 3.富士ピー・エスTechnical Section)

キーワード：CFRP sheets, CFRPシート, debonding, prestressed concrete beam, shear strengthening, せん断補強, プレストレストコンクリートはり, 剥離

This paper discusses the performance of pretensioned prestressed concrete beams strengthened in shear using externally bonded CFRP sheets. The shear capacity and stiffness in the post-cracking region were increased with smaller spacing between the strips of CFRP sheets. Furthermore, the strip spacing, wrapping types and thickness of CFRP sheets influenced failure behaviors of the strengthened PC beams. Besides, the equations in the design guidelines of ACI and JSCE overestimated the shear capacity carried by bonded CFRP sheets for strengthening PC beams.