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자료유형
학술저널
저자정보
Rodrigues, Joao Paulo C. (LAETA, Department of Civil Engineering, University of Coimbra) Correia, Antonio J.M. (LAETA, Department of Civil Engineering, Polytechnic Institute of Coimbra) Kodur, Venkatesh (Department of Civil & Environmental Engineering, Michigan State University)
저널정보
한국초고층도시건축학회 International journal of high-rise buildings International journal of high-rise buildings 제7권 제4호
발행연도
2018.1
수록면
313 - 325 (13page)

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Concrete-filled steel tubular (CFST) members are commonly used as composite columns in modern construction. However, the current guidelines for members' fire design (EN1994-1-2) have been proved to be unsafe in case the relative slenderness is higher than 0.5. In addition, the simplified design methods of Eurocode 4 are limited to circular and square CFST columns, while in practice columns with rectangular and elliptical hollow sections are being increasingly used because of their architectural aesthetics. In the last years a large experimental research has been carried out at Coimbra University on the topic. They have been tested concrete filled circular, square, rectangular and elliptical hollow columns with restrained thermal elongation. Some parameters such as the slenderness, the type of cross-section geometry as well as the axial and rotational restraint of the surrounding structure to the column have been tested in order to evaluate their influence on the fire resistance of such columns. In this paper it is evaluated the influence of the boundary conditions (pin-ended and semi-rigid end-support conditions) on the behavior of the columns in case of fire. In these tests it could not be seen a marked effect of the tested boundary conditions but it is believed that the increasing of rotational stiffness increases the fire resistance of the columns.

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