double linear strain distribution assumption of RC beam strengthened with external-bonded or near-surface mounted fiber reinforced plastic
来源期刊：中南大学学报(英文版)2012年第12期
论文作者：Ren Zhen-hua (任振华) Liu Han-long (刘汉龙) Zhou feng-jun (周丰峻)
文章页码：3582 - 3594
Key words：double linear strain distribution assumption; external-bonded structure, near-surface mounted structure; fiber reinforced plastic; strengthening; concrete beam
Abstract: Rehabilitation of existing structures with fiber reinforced plastic (FRP) has been growing in popularity because they offer superior performance in terms of resistance to corrosion and high specific stiffness. The strain coordination results of 34 reinforced concrete beams (four groups) strengthened with different methods were presented including external-bonded or near-surface mounted glass or carbon FRP or helical rib bar in order to study the strain coordination of the strengthening materials and steel rebar of RC beam. Because there is relative slipping between concrete and strengthening materials (SM), the strain of SM and steel rebar of RC beam satisfies the double linear strain distribution assumption, that is, the strain of longitudinal fiber parallel to the neutral axis of plated beam within the scope of effective height (h0) of the cross section is in direct proportion to the distance from the fiber to the neutral axis. the strain of SM and steel rebar satisfies the equation , where the value of β is equal to 1.1-1.3 according to the test results.
Ren Zhen-hua (任振华) 1, Liu Han-long (刘汉龙) 1, Zhou feng-jun (周丰峻)2
(1．Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering
(Hohai University), Nanjing 210098, China；
2. The fourth Engineer Scientific Research Institute of the Headquarters of the General Staff, Beijing 100850, China)
Abstract:Rehabilitation of existing structures with fiber reinforced plastic (FRP) has been growing in popularity because they offer superior performance in terms of resistance to corrosion and high specific stiffness. The strain coordination results of 34 reinforced concrete beams (four groups) strengthened with different methods were presented including external-bonded or near-surface mounted glass or carbon FRP or helical rib bar in order to study the strain coordination of the strengthening materials and steel rebar of RC beam. Because there is relative slipping between concrete and strengthening materials (SM), the strain of SM and steel rebar of RC beam satisfies the double linear strain distribution assumption, that is, the strain of longitudinal fiber parallel to the neutral axis of plated beam within the scope of effective height (h0) of the cross section is in direct proportion to the distance from the fiber to the neutral axis. the strain of SM and steel rebar satisfies the equation , where the value of β is equal to 1.1-1.3 according to the test results.
Key words:double linear strain distribution assumption; external-bonded structure, near-surface mounted structure; fiber reinforced plastic; strengthening; concrete beam
