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• PHC 파일을 기둥재로 적용하기 위한 실험적 연구

– 저자 : 김성진, 김성배, 이창남, 목진오, 허건영, 이병락, 김상섭

The purpose of this study was to apply PHC column in underground parking lot. The load is transferred to the concrete core from a steel beam through the contacted face between an in-filled concrete and the inner surface of a steel
tube. And a Push-out test was performed to investigate the load transfer mechanism. The main parameters considered for this study included thickness of steel tube, a welding quantity, interval of shear key. Test results were summarized
to confirmed load transfer behavior between the concrete and steel tube for each experimental parameter, using the analytical approach to verify experimental results.

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• 단순지지 TSC 합성보의 부착강도가 휨 내력에 미치는 영향에 관한 실험적 연구

– 저자 : 박영수, 허재성, 서동기, 이창남, 김상섭

Recently developed TSC beam is composite structure. Stud bolts were used as shear connectors at the composite beam to resist the horizontal shear forces occurred between concrete slab and U type steel beam. In this study, interface delamination test was conducted to know relationship between bond strength which is affected by crack of concrete and flexural strength of TSC composite beam. Form oil and sand were used for four specimens to generate interface and compared with two standard specimens.

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• PHC 파일에 부착한 밴드플레이트의 부착강도에 관한 연구

– 저자 : 김성배, 김성진, 김상섭

The purpose of this study was to apply column with PHC pile. The operated load on PHC pile are transferred to the concrete core from a steel beam through a contacted face between an in-filled concrete and the interior surface of a steel band plate. And a push-out test was performed to investigate the load transfer mechanism and the bond strength of band plate. The main parameters considered for this study included thickness of steel band plate, a welding quantity, interval of shear key. Test results were summarized to confirmed load transfer behavior between a concrete and steel band plate for each experimental parameter, using the analytical approach to verify experimental results.

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• 앵글과 철근을 조립한 PSRC 합성기둥의 휨 실험

– 저자 : 엄태성, 황현종, 박홍근, 이창남, 김형섭

PSRC column is a concrete encased steel angle column. In the PSRC column, the steel angles placed at the corner of the cross-section resists bending moment and compression load. The lateral re-bars welded to steel angles resist the column shear and the bond between the steel angle and concrete. In the present study, current design procedures in KBC 2009 were applied to the flexure-compression, shear, and bond design of the PSRC composite column. To verify the validity of the design method and failure mode, simply supported 2/3 scaled PSRC and correlated SRC beams were tested under two point loading. The test parameters were the steel angle ratio and lateral bar spacing. The test results showed that the bending, shear, and bond strengths predicted by KBC 2009 correlated well with the test results. The flexural strength of the PSRC specimens was much greater than that of the SRC specimen with the same steel ratio because the steel angles were placed at the corner of the column section. However, when the bond resistance between the steel angle and concrete was not sufficient, brittle failures such as bond failure of the angle, spalling of cover concrete, and the tensile fracture of lateral re-bar occurred before the development of the yield strength of PSRC composite section. Further, if the weldability and toughness of the steel angle were insufficient, the specimen was failed
by the fracture of the steel angle at the weld joint between the angle and lateral bars.