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Development of a Nonlinear Concrete Model for Internally Confined Hollow Members Considering Confining Effects  

Han, Taek Hee (고려대학교 공학기술연구소)
Youm, Eung Jun (고려대학교 토목환경공학과)
Han, Sang Yun (고려대학교 강구조협동과정)
Kang, Young Jong (고려대학교 사회환경시스템공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.19, no.1, 2007 , pp. 43-52 More about this Journal
Abstract
There is a growing range of applications for concrete-filled steel tube (CFT) member because of its superior performance. But a CFT member may be uneconomical or has weight problems because it is fully filled with concrete. In this study, a new type of member, called internally confined hollow (ICH) CFT member, was developed to solve the high cost and weight problems of the CFT member. To determine stress-strain model of the concrete in an ICH CFT column, possible failure modes of an ICH CFT column were suggested and confining pressure was derived from equilibriums for each failure mode. From the derived equations, a computer program was coded and parametric studies were performed for some examples. Analytical results showed that internally confined concrete has enhanced strength and ductility compared with those of unconfined or biaxially confined concrete.
Keywords
nonlinear; concrete model; CFT; confined concrete; confining effect;
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