EVALUATION OF MODELS AND PROPOSING A NEW MODEL OF CIRCULAR COLUMNS CONFINED WITH DIFFERENT FRP COMPOSITES
Two analytical popular models are employed to find concrete stress-strain relationship of three scalemodel circular columns confined with different types of fiber-reinforced polymer (FRP) composites. The second ascending part of the stress-strain relationship of well confined concrete is evaluated in the light of available database from the existing literature using these models. The results showed that the examined models do not satisfy the criterion that the slope of the second branch of the stressstrain curve of sufficiently confined concrete is independent of FRP types, provided the design confinement modulus is the same. A comparison of predicted values of the second stiffness with the collected test results of 249 cylinder specimens confined with composites revealed the necessity for a more accurate model. A model considering the effect of FRP confinement modulus is proposed.
circular columns confined concrete confinement stiffness FRPs stress-strain relationship
Mohamed Fahmy Zhi-Shen Wu
Urban & Civil Engineering Department, IbarakiUniversity, Nakanarusawa-cho, Hitachi 316-8511, Japan
国际会议
广州
英文
336-344
2009-11-28（万方平台首次上网日期，不代表论文的发表时间）