Built Environment Research Laboratory

Algiers, Algeria

Built Environment Research Laboratory

Algiers, Algeria
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Ihaddoudene A.N.T.,Built Environment Research Laboratory | Saidani M.,Coventry University | Jaspart J.P.,University of Liège
Engineering Structures | Year: 2017

The present work deals with the effect of beam-column joint flexibility on the elastic buckling load of plane steel frames. A simple and effective mechanical model is proposed and the corresponding stiffness matrix is presented. The model consists in the development of comprehensive approach taking into account, simultaneously, the effects of the joint rigidity, the elastic buckling load, and this for both sway and non-sway frames. As has been shown by previous research, only one element is required over the length of the element to model stability. This is a marked contribution and advantage of the proposed method, as well as its simplicity, and yet accuracy, to solve practical problem with little computational effort. Also, it includes stability functions in the stiffness matrix, something very often ignored by researchers. Numerical results are obtained for frames with various characteristics and support conditions when three illustrative examples from the literature are presented and discussed. The elastic buckling load is found to be strongly affected by semi-rigid joints and reveals that the proposed model is computationally very efficient with the expressions presented being general. The paper makes reference to the Eurocode 3 approach and those of other researchers in comparing the results. The proposed method is found to be more effective and simple to use, and yielding to very good results. © 2017


Adman R.,Built Environment Research Laboratory | Saidani M.,Coventry University
Civil-Comp Proceedings | Year: 2010

The objective of this study is to propose a criterion of stability capable of predicting an impending failure by elastic buckling of an element of a structure consisting of beam-column elements. In this work, the focus is on the effect of the rigidities of springs (rotational and translational), positioned at the ends of an element (beamcolumn) vis-à-vis the stability analysis. The role of the springs is to model the nodal restraints of any element of a given structure. This formulation offers significant practical advantages in the elastic buckling analysis of such structures. This approach is performed through a relationship to several parameters, such as the relative retention factors and the factor K. This relationship can be regarded as particularly reliable as justified by the good results achieved regarding the rupture of several buckling structures that were investigated. Comparison the results obtained by the current study and those from the Eurocode for calculating the effective length factor K shows a substantial difference between the two formulations, particularly in the case of non-braced structures. © Civil-Comp Press, 2010.

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