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Steel and Composite Structures
  Volume 5, Number 4, August 2005 , pages 325-340

Structural performance of cold-formed steel columnrnbases with bolted moment connections
K. F. Chung, W. K. Yu and A. J. Wang

    . This paper presents a thorough investigation into the structural performance of cold-formed steelrncolumn bases using double lipped C sections with bolted moment connections. A total of four column baserntests with different connection configurations were carried out, and it was found that section failure under combined bending and shear was always critical. Moreover, the proposed column bases were demonstrated to be structurally efficient attaining moment resistances close to those of the connected sections.rnIn order to examine the structural behaviour of the column base connections, a finite element model wasrnestablished using shell and spring elements to model the sections and the bolted fastenings respectively. Both material and geometrical non-linearities were incorporated, and comparison between the test and thernnumerical results was presented in details. The design rules originally developed for bolted momentrnconnections between lapped Z sections were adopted and re-formulated for the design of column basernconnections after careful calibration against the test data. Comparison on co-existing moments and shearrnforces at the critical cross-sections of the column bases was fully presented. It was shown that the proposed design and analysis method was structurally adequate to predict the failure loads under combined bending and shear for column bases with similar connection configurations.
Key Words
    column bases; bolted moment connections; section failure under combined bending and shear; finite element modelling.
Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, P. R. China

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