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• 콘크리트채움 U형 강재보 – 콘크리트 기둥 접합부의 내진성능

– 저자 : 황현종, 박홍근, 이철호, 박창희, 이창남, 김형섭, 김성배

In thisstudy,theseismicdetailsofaconcrete-encased,U-shaped steelbeam-to-RC column connection were developed.Three specimens of the beam-to-column connection were tested under cyclic loading to evaluate the seismic performance of the connection. The test parameters were the beam depth and the column section shape. The depths of
the composite beams were 610 and 710 mm, including the slab depth. For the RC columns, a square section and a circular section were used. Special details using diagonal re-bars and exterior diaphragm plates were used to strengthen the connections with the rectangular and circular columns, respectively. The test results showed that the specimens exhibited good strength, deformation, and energy dissipation capacities. The deformation capacity exceeded 4% interstory drift angle,which is the requirement for the Special Moment Frame.

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• 콘크리트채움 U형 강재보-강재기둥 합성 내진접합부에 대한 주기하중 실험

– 저자 : 박홍근, 이철호, 박창희, 황현종, 이창남, 김형섭, 김성배

In this study, seismic resistance of concrete encased U-shaped steel beam-to-steel H-shaped column connections was evaluated.Three specimens ofthe beam-to-column connection were tested undercyclic loading.The compositebeam was integrated with concrete slab using studs. Re-bars for negative moment were placed in the slab. The primary test parameter was the details of the connections, which are strengthening and weakening strategies for the beam  end and the degree of composite action. The depth of the composite beams was 600mm including the slab thickness. The steel beam and there-bars in the slab were weld-connected to the steel column. For the strengthening strategy, cover plates were weld-connected to the bottom and top flanges of the steel beam. For the weakening strategy, avoid using styrofoam box was located inside the core concrete at the potential plastic hinge zone. The test results showed that the fully composite specimens exhibited good strength, deformation, and energy dissipation capacities. The deformation capacity of the beam exceeded 4% rotation angle, which is the requirement for the Special Moment Frame.