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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 91
Edited by: B.H.V. Topping, L.F. Costa Neves and R.C. Barros
Paper 137

A Single Equation Yield Surface of an I-Section for Bimoment and Biaxial Bending Moments

A. Shoaib and R.P. West

Department of Civil, Structural and Environmental Engineering, Trinity College, University of Dublin, Ireland

Full Bibliographic Reference for this paper
A. Shoaib, R.P. West, "A Single Equation Yield Surface of an I-Section for Bimoment and Biaxial Bending Moments", in B.H.V. Topping, L.F. Costa Neves, R.C. Barros, (Editors), "Proceedings of the Twelfth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 137, 2009. doi:10.4203/ccp.91.137
Keywords: yield surface, single equation, bimoment, biaxial bending moments, finite element analysis, verification.

A single equation yield surface is presented under the combined action of bimoment and biaxial bending moments to model the plastification of structural I-sections. The proposed single yield surface equation represents a smooth, continuous and convex surface in three dimensional space. To verify the single equation yield surface, a finite element study is performed using LUSAS with four-noded isoparametric thick shell elements. When the verification of the yield surface equation was satisfactorily performed using finite element analysis, this technique was then used to fill the gaps which existed in a previous solution. The proposed single equation is easy to implement in a computer-based elasto-plastic analysis and is therefore recommended for general use.

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