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안종문(Ahn Jong-Mun),반병열(Bahn Byong-Youk),신성우(Shin Sung-Woo) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.1
As the social demand is increasing in high-rise building, high-strength concrete(HSC) is issued. HSC has a lot of merits in strength. But, HSC shows brittle failure mode which has to be enhanced in ductility. So, the ductility can be improved by confinement of transverse tie, which is affected by amount, spacing, strength and configuration of lateral reinforcement and compressive strength of concrete. More experimental results in wide range of test parameters for HSC columns have to be accumulated to evaluate performance of HSC columns. Furthermore, the HSC column is overestimated as a current design code is almost based on the test results of normal strength concrete(NSC). Thus, code provisions for both design of HSC columns and confinement effect of HSC columns are demanded.<br/> An experimental study was conducted to investigate the behavior of reinforced concrete columns confined with various configuration of reinforcement. A total of 30 specimens were tested under monotonically increasing concentric compression. The test parameters included were the volumetric ratio of transverse reinforcement(ph = 0.49~2.65), tie configuration(S-type, SO-type, SR-type) and concrete compressive strength (23.4, 43.7, 70.3MPa). Test results indicate that behavior of reinforced concrete columns is influenced on the tie configuration and concrete compressive strength with almost equal volumetric ratio of transverse reinforcement and approximately equal tie spacing, and on the volumetric ratio of transverse reinforcement.
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