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• 콘크리트채움 U형 합성보의 소개

– 저자 : 이창남, 김법렬

최근 들어 건축재료를 효율적으로 이용하기 위한 합성구조 설계 사례가 중가하고 있다.합성구조는 상이한 두 가지 이상의 재료를 이용하여 물랑대비 구조성능을 향상시키는 것이다 일반적인 합성보의 형태는 H형 강재보와 상부 슬래브로 구성된 것이며， 근래 들 어 다양한 형태의 합성보가 개발되었다 대표적인 합성보는 U형 강재 합성보다 이는 (주)샌구조연구소에서 개발한 신공법 및 신기술 중 하나로 TSC 합성보로 명영하였으며， 개요와 특성， 적용사례 등을 간략히 소개하고자 한다

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• 콘크리트채움 U형 합성보와 선조립기둥의 내진접합부 성능실험

– 저자 : 김형섭, 이창남, 이승환, 김법렬

In this paper, the connection details of the prefabricated RC/SRC columns and a concrete-encased U-shaped steel beam is presented, and their seismic resistance performance is evaluated through a full-scale test. One of the life-scale column specimens for the test is a prefabricated RC column built with reinforcing bars, and the other one is a prefabricated SRC column built with L-shaped angle steels and reinforcing bars. Both of the columns are fully fabricated at factory by precise shop welding, so they don’t need on-site bar arrangement and temporary supports. Although there were many other seismic resistance performance evaluation tests with the forenamed columns and beams, but most of the previous tests were mainly arranged to demonstrate the performance of the connections as the special moment frame (SMF). However, in majority of real-world cases special moment frame is generally not common due to high cost and low workability. This paper presents more practical connection details of beam-to-column connections which accord with the intermediate moment frame (IMF) conditions as defined in the Korea Building Code 2009 (KBC2009) and, also, presents the result of the test which proves the aforementioned claim by using the life-scale specimens and finite element analysis.

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• Cyclic Seismic Testing of Composite Concrete-Filled U-shaped Steel Beam to H-Shaped Column Connections

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

In this study, the cyclic seismic performance of a concrete-filled U-shaped steel beam to H-shaped steel column connections was experimentally
evaluated. The concrete-filled U-shaped steel beams were compositely attached to the concrete floor slab. The test was conducted in two stages. The first testing program was carried out on one-sided moment connections to find the most promising connecting scheme. The strengthening scheme, or welding steel plates to the beam bottom flange with minimized stress concentration, was shown to be the most satisfactory, and it was used in the second-stage test on two full-scale cruciform specimens. Considering the unique constructional nature of the proposed composite connections, the critical limit states such as weld fracture, local buckling, concrete crushing, and rebar buckling were carefully addressed in designing specimens. Test results showed that the connection details and design procedures proposed in this study can successfully control the critical limit states mentioned previously. The proposed connection detail successfully pushed the plastic hinging to the tip of the strengthened zone as intended in design, thus effectively protecting the more vulnerable beam-to-column welded joint. The specimens typically exhibited a maximum story drift capacity of more than 5.5% rad, exceeding the minimum limit of 4% rad required of special moment frames. Four of the five specimens tested in this study eventually failed because of a low-cycle fatigue fracture across the beam bottom flange at a high story drift greater than 5.0% rad.