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Lateral buckling of semi-continuous frames: From theory to practice
An original formulation for lateral buckling analysis of semi-continuous frames and partially end restrained members by finite element method (FEM) is presented. The formulation developed has been implemented to the concept of advanced structural analysis for steel framed structures. Three connection classes and the moment-angular slip characteristics described by a multi-linear and a suitable probabilistic based non-linear analytical formulae, have been identified and proposed for the advanced frame analysis. The refined 2D advanced analysis discussed here includes inelastic behaviour, large in-plane deflections, joint semi-rigid properties and flexural-torsional mode of failure for complete structural system. The fixity factor based approach adopted in this work is used in order to trace the frame both in-plane bending deflection response and out-of-plane critical points on the structure primary equilibrium path. A simple incremental technique was adopted and the tangential in-plane fixity factors have to be updated at the beginning of each incremental step. The member inelastic behaviour associated with the in-plane plastic hinge response is being introduced in a conventional way. FEM out-of-plane analysis includes the connection out-of-plane fixity factors associated with the initial stiffnesses due to minor axis bending and warping. Member out-of-plane shear deformations produced by minor axis non-uniform bending and non-uniform torsion have been conveniently accounted for in the non-classical shape functions derived for the semi-rigidly connected member line finite element. The basis for computer program implementation has therefore been created by the development of the computer program PHINGE-R, a modified version of PHINGE developed by Liew and Chen. The verification of the lateral buckling FEM model developed and some examples of elastic frame ultimate load have been presented and discussed.
Lateral buckling of semi-continuous frames: From theory to practice
An original formulation for lateral buckling analysis of semi-continuous frames and partially end restrained members by finite element method (FEM) is presented. The formulation developed has been implemented to the concept of advanced structural analysis for steel framed structures. Three connection classes and the moment-angular slip characteristics described by a multi-linear and a suitable probabilistic based non-linear analytical formulae, have been identified and proposed for the advanced frame analysis. The refined 2D advanced analysis discussed here includes inelastic behaviour, large in-plane deflections, joint semi-rigid properties and flexural-torsional mode of failure for complete structural system. The fixity factor based approach adopted in this work is used in order to trace the frame both in-plane bending deflection response and out-of-plane critical points on the structure primary equilibrium path. A simple incremental technique was adopted and the tangential in-plane fixity factors have to be updated at the beginning of each incremental step. The member inelastic behaviour associated with the in-plane plastic hinge response is being introduced in a conventional way. FEM out-of-plane analysis includes the connection out-of-plane fixity factors associated with the initial stiffnesses due to minor axis bending and warping. Member out-of-plane shear deformations produced by minor axis non-uniform bending and non-uniform torsion have been conveniently accounted for in the non-classical shape functions derived for the semi-rigidly connected member line finite element. The basis for computer program implementation has therefore been created by the development of the computer program PHINGE-R, a modified version of PHINGE developed by Liew and Chen. The verification of the lateral buckling FEM model developed and some examples of elastic frame ultimate load have been presented and discussed.
Lateral buckling of semi-continuous frames: From theory to practice
Längsknickung halbkontinuierlicher Stahlrahmen: Von der Theorie zur Praxis
Gizejowski, M.A. (author) / Barszcz, A.M. (author) / Uzoegbo, H.C. (author)
Structural Steel Developing Africa, 1996 ; 121-129
1996
9 Seiten, 5 Bilder, 12 Quellen
Conference paper
English
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