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구속효과를 고려한 내부 구속 중공 철근콘크리트의 비선형 재료 모델 개발
한택희(Han Taek Hee),윤기용(Yoon Ki-Yong),이창수(Lee Chang-Soo),강진욱(Kang Jin-Ook),이명섭(Lee Myeoung-Sub),강영종(Kang Young-Jong) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
When concrete is confined triaxially, its strength and toughness are enhanced. Hoop reinforcements or transverse reinforcements laterally confine concrete in a R.C member. But biaxially confined concrete, such as concrete in a hollow R.C member, does not have much enhanced strength and toughness. In this study, a new-type member, which is a hollow R.C member named as an ICH(Internally Confined Hollow) R.C member, was developed to overcome the low ductility of the hollow member and the low strength of the hollow R.C member. A material nonlinear model for the concrete in an ICH R.C member was developed and coded as a computer program based on Mander"s concrete model. Analysis results were verified with experimental results and the developed analysis model showed reasonable and accurate results.
한택희(Han Taek Hee),염응준(Youm Eung-Jun),윤기용(Yoon Ki-Yong),강진욱(Kang Jin-Ook),이명섭(Lee Myeoung-Sub),강영종(Kang Young-Jong) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Concrete in a R.C column has enhanced strength and ductility because it is confined by transverse reinforcements. But R.C columns are designed based on linear analyses by stress block method without the confining effect or the nonlinearity of the concrete. These make the significantly difference between the analysis results and the experimental results. And also ICH R.C column(Internally Confined Hollow R.C column), a new-typed column, has enhanced moment capacity and axial strength by a settled steel tube when it is compared with a hollow R.C column. Thus in this study, nonlinear P-M interaction models for a general R.C column and an ICH R.C column were developed considering the confining effect on the concrete in a column. With the developed model, parametric studies were performed and the developed column models showed reasonable and accurate results.