Part I: Modified Buckling Factor for Columns in Braced and Unbraced Frames with Composite Girders

A. Eltawil, S.; M. Abdrabou, S.; S. Mahmoud, N.

doi:10.21608/bfemu.2022.235650

Part I: Modified Buckling Factor for Columns in Braced and Unbraced Frames with Composite Girders

Document Type : Research Studies

Authors

¹ Msc at Structural Engineering department, Faculty of Engineering, Mansoura University, Egypt.

² Professor of Structural Engineering department, Faculty of Engineering, Mansoura University, Egypt

³ Professor of Structural Engineering department, Faculty of Engineering, Mansoura University, Egypt.

10.21608/bfemu.2022.235650

Abstract

In the current paper, the influence of composite girders on modified buckling factor values was studied in braced and unbraced frames in which the composite girders' far ends were represented as fixed and rigid. Moreover, the derived formulation is based on the modified stiffness parameter and pursues the same assumptions as in the standard effective length factor (K-factor). Furthermore, the slope-deflection method was used to obtain the modified buckling factor formulae for composite girders in braced and unbraced frames. After that, the relationship between the critical buckling factor and beam length has been demonstrated for practical purposes. In addition, the composite girders' effects on effective length parameters are illuminated using illustrative examples that utilize the various girders' far-end conditions. Eventually, we can draw the conclusion that the modified stiffness factor for composite girders must be considered in the calculations of K-factor for braced and unbraced frames in order to achieve an accurate and economical design

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