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• Numerical Investigation on Load-carrying Capacity of High-strength Concrete-encased Steel Angle Columns

• 저자: 김창수, 황현종

• Abstract: To investigate the load-carrying capacity of high-strength concrete-encased steel angle (CES-A) columns, in which corner steel angles are encased in concrete and transmit column loads directly, a numerical study was performed by using a proposed analysis model. The proposed model considered the strain compatibility, confinement effect, local buckling, and premature cover-spalling, and was verified against previous experimental study results. To investigate the effect of design parameters, a parametric study was conducted, and based on the parametric study results, a simple approach was also discussed to predict the residual strength (2nd peak load) after spalling of concrete cover at corners (1st peak load). The numerical investigations showed that when steel contribution and confinement efficiency are high, CES-A columns exhibit relatively large load-carrying capacity even after cover-spalling, due to the maintained strength of confined concrete and yielding of steel angles, and the proposed simple approach gave a good prediction for the residual strength.

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• 기둥이음 오차흡수를 위한 대형구멍 단부강판 접합방법(Oversized Hole End-Plate Connection for Column Splice with Misalignment)

• 저자: 임종진, 엄태성, 이승환, 김대경

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• 고강도 앵글을 이용한 매입형 합성기둥의 구조성능평가(Performance Evaluation of Encased Composite Column using High-Strength Angles)

• 저자: 김진용, 김대경, 임종진

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• 매입형 합성기둥에 사용된 앵글 단부강판접합부의 수치적 연구(Numerical Study of Bolted End-Plate Splice of Angles Applied in Encased Composite Columns)

• 저자: 김정현, 엄태성, 김대경, 임종진

• 저자: 엄태성, 양종민, 김대경, 임종진, 이승환

• Abstract: This study investigates a bolted end-plate splice of steel angles for encased composite columns. For the splice, two end plates, each of which is welded at the end of the spliced angle, are butted to each other, and connected in tension by one or three high-strength bolts. Since the centroids of the angle and bolt sections do not coincide, the deformation and prying force occurring at the connection need to be considered for design. Thus, the minimum thickness of end plate is proposed based on the yield line theory, and the tensile strength of the connection decreased by the prying force is estimated. The strength and failure mode of the connection are investigated through the direct tension tests of bare angle splice, and flexural tests of encased composite column with angle splice. The tests have shown that the connection is susceptible to slip and fracture in the threaded portion of bolt. In addition, the proposed minimum end-plate thickness and connection strength agree well with the test results.