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낮은 압축력을 받는 철근콘크리트 기둥의 내진성능에 대한 띠철근 상세의 영향
김철구,박홍근,엄태성,김태완 한국지진공학회 2015 한국지진공학회논문집 Vol.19 No.4
Various non-seismic tie details are frequently used for one- and two-story small buildings because the seismic demand on their deformation capacities is not relatively significant. To evaluate the effects of the non-seismic tie details on the seismic performance of reinforced concrete columns, six square columns with a cross section of 400 × 400 mm and six rectangular columns with a cross section of 250 × 640 mm were tested. The anchorage details at both ends and spacing of tie hoops, along with the cross-sectional shape and the magnitude of axial load, were considered as the primary test parameters. Test results showed that square columns had higher stiffness and lower lateral deformation rather than rectangular columns. Both lap spliced tie and U-shaped tie provided comparable or improved seismic performance to 90° hook tie in terms of maximum strength, ductility, and energy dissipation. The predicted curves with modeling parameters in ASCE41-13 were conservative for test results of lap spliced tie and U-shaped tie specimens since plastic behavior after flexural yielding could not be considered. For economical design, ASCE41-13 should be revised with various test results of tie details.
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김철구,박홍근,김태완,엄태성 한국지진공학회 2016 한국지진공학회논문집 Vol.20 No.6
In regions of low-to-moderate seismicity, various types of lap splices are used for longitudinal reinforcement of columns at the plastic hinge zones. The seismic performance of such lap spliced columns, such as strength, deformation capacity, and energy dissipation, is affected by material strengths, longitudinal re-bar size, confinement of hoops, lap splice location, and lap splice length. In the present study, cyclic loading tests were performed for columns using three types of lap splices (bottom offset bar splice, top offset bar splice, and splice without offset bend). Lap splice length(40db and 50db) was also considered as test parameters. Ties with 90-degree end hooks were provided in the lap splice length. The test results showed that strength, deformation capacity, and energy dissipation of columns significantly differed depending on the details and the length of lap splices. The bottom offset bar splice showed high ductility and energy dissipation but low strength; on the other hand, the top offset bar splice and the splice without offset bend showed high strength but moderate ductility and energy dissipation.
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김철구,김영문,박홍근 한국콘크리트학회 2022 콘크리트학회논문집 Vol.34 No.1
증기양생 경량기포 콘크리트(ALC) 블록은 모르타르와 접합되어 구조체를 형성하기 때문에 ALC 프리즘의 구조성능이 중요하다. 본 연구에서는 이러한 ALC 프리즘의 직접전단부착강도에 대해 실험적으로 평가하였다. 주요 실험변수로 ALC 블록 강도, 계면 압축력, 유리섬유(GFRP)와 다우얼 철근 보강 여부를 고려하였다. 실험결과, 전단부착강도는 ALC 블록 압축강도가 낮고 줄눈 모르타르 강도가 높은 경우 증가하였다. ALC 블록 계면에서의 압축응력이 증가할수록 전단부착강도는 증가하였고, 최대하중 이후 잔류응력도 함께 증가하였다. 벽면 GFRP 보강은 최대하중 이후 잔류응력을 향상시켰다. 전단부착강도를 증가시키기 위해서는 계면 사이 다우얼 철근을 보강하는 것이 가장 효과적이었다.
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