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...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 εGCH=βεsteel,where the value of β is equal to 1.1-1.3 according to the test results.展开更多
为了研究低强混凝土配筋柱在碳纤维增强聚合物(CFRP)加固后的受压行为,使用ABAQUS软件对低抗压强度的钢筋混凝土柱进行数值模拟及参数分析,采用三维实体单元和三维桁架单元分别对混凝土柱及钢筋进行建模,采用混凝土损伤塑性模型考虑基...为了研究低强混凝土配筋柱在碳纤维增强聚合物(CFRP)加固后的受压行为,使用ABAQUS软件对低抗压强度的钢筋混凝土柱进行数值模拟及参数分析,采用三维实体单元和三维桁架单元分别对混凝土柱及钢筋进行建模,采用混凝土损伤塑性模型考虑基体压缩和拉伸的损伤。结果表明:相比配筋柱,采用3 mm CFRP护套加固的低强钢筋混凝土柱的承载力提高34%。对于不同基体强度的混凝土配筋柱,CFRP护套存在最优加固厚度。展开更多
基金Project(11B033)supported by the Foundation for Excellent Young Scholars of Hunan Scientific Committee,ChinaProject(116001)supported by the Consultative Program of the Chinese Academy of Engineering+1 种基金Project(11JJ6040)supported by the National Natural Science Foundation of Hunan Province,ChinaProject(2010GK3198)supported by the Science and Research Program of Hunan Province,China
文摘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 εGCH=βεsteel,where the value of β is equal to 1.1-1.3 according to the test results.
文摘为了研究低强混凝土配筋柱在碳纤维增强聚合物(CFRP)加固后的受压行为,使用ABAQUS软件对低抗压强度的钢筋混凝土柱进行数值模拟及参数分析,采用三维实体单元和三维桁架单元分别对混凝土柱及钢筋进行建模,采用混凝土损伤塑性模型考虑基体压缩和拉伸的损伤。结果表明:相比配筋柱,采用3 mm CFRP护套加固的低强钢筋混凝土柱的承载力提高34%。对于不同基体强度的混凝土配筋柱,CFRP护套存在最优加固厚度。
