Journal of Applied Engineering Science & Technology
Volume 2, Numéro 2, Pages 91-97
2016-12-22
The Effective Length Estimation Of Columns In Semi-rigid Jointed Braced Frames
Authors : Meghezzi-larafi Ismail . Tati Abdelouahab .
Abstract
This paper presents a theoretical and exact procedure for the stability analysis of braced steel frames, taking in account the flexibility effect of the beam-column connections. In order to determine the effective length factor (K-factor). The isolated subassembly approach is used to establish the buckling governing equation. In this study, the relative stiffness coefficient at the isolated column ends is provided by the remainder members of the structure, rather than of the relative stiffness factor in the alignment chart method. A computer program for plane structure analysis is used to evaluate the relative stiffness coefficients. To illustrate the accuracy of the established transcendental equation, K-factor values for the case of fully rigid connections, are compared to the exact and the French rules results. The effect of the type of transfer elements between the frame members, in term of fixity factors is investigated. Moreover, the effect of restraining conditions, provided by the whole frame structure, in term of relative stiffness coefficients, is also studied. The obtained results revealed that the buckling critical loads of the columns in frames of rigid members are significantly affected by the fixity factors variation, unlike in flexible structures.
Keywords
Effective length factor; Semi-rigid connection; Braced frame; Relative stiffness coefficient
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