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• 고강도강을 적용한 콘크리트 채움 U형 하이브리드 합성보 휨성능 평가(Flexural Testing of Concrete-filed U-shape Hybrid Composite Beams with High-strength Steel)

저자: 소현준, 박창희, 이철호, 이승환, 김형섭, 오하늘

In this research, the flexural test of concrete-filled U-shape hybrid composite beam, in which SS400 and SM570 steel plates were applied in the web and bottom flange of U-shape steel section respectively, were performed. For evaluating flexural performances, four full-scale specimens were designed considering strain compatibility method and fabricated according to KBC 2009 and AISC 2010 specification. Specimens were tested under four point loading configuration, which generate uniform moment in the center of the composite beam. The test parameters were the effect of hybrided U-shape steel section with a high strength steel in bottom flange and longitudinal variation of steel grade and section via welding splice. Among the test, S3 and S4 are key specimens. S4 is composed of two 6mm-thick cold formed Z section as web and a 12mm-thick SM570 plate as bottom flange by flare welding. S3 has the identical section with S4 except that homogeneous SS400 U-shape steel section is applied at the end part of beam for increasing structural efficiency. The major test results showed that all specimens exhibit the plastic moment capacity and sufficient ductility with end rotation ranging from 0.021 to 0.023radian.