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Structural Performance of Concrete-encased Steel Columns using 800MPa Steel and 100MPa Concrete  

Kim, Chang-Soo (서울대학교 건축학과)
Park, Hong-Gun (서울대학교 건축학과)
Choi, In-Rak (포항산업과학연구원 건축해양연구본부)
Chung, Kyung-Soo (포항산업과학연구원 건축해양연구본부)
Kim, Jin-Ho (포항산업과학연구원 건축해양연구본부)
Publication Information
Journal of Korean Society of Steel Construction / v.22, no.5, 2010 , pp. 497-509 More about this Journal
Abstract
Five concrete-encased steel columns using high-strength steel($f_{ys}$=801MPa) and high-strength concrete($f_{ck}$=97.7MPa) were tested to investigate the eccentric axial load-displacement relationship. Test parameters included the type, yield strength, and spacing of lateral reinforcement, and also the eccentricity of axial load. To analyze the behavior of the column specimens, the nonlinear sectional analysis using strain-compatibility and confinement effect was performed. To examine the applicability of existing design codes for the composite sections using high-strength materials, the test results were also compared with the predictions by the nonlinear analysis and the design codes. The confinement effect of lateral reinforcement increased the ductility of concrete, and the moment capacity of the column specimens increased with the ductility of concrete. The prediction by the nonlinear analysis gave good agreement with the test results. On the other hand, the ACI 318 neglecting lateral confinement effect underestimated the strength of the column specimens, and the Eurocode 4 using complete plastic capacity of steel section overestimated.
Keywords
concrete-encased steel; composite column; high-strength steel; high-strength concrete; eccentric loading;
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