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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 4/5
Edited by: B.H.V. Topping
Paper XVIII.1

Improved Convergence of the Influence Coefficient Method

R. Carneiro de Barros

Department of Civil Engineering, Universidade do Porto, Portugal

Full Bibliographic Reference for this paper
R. Carneiro de Barros, "Improved Convergence of the Influence Coefficient Method", in B.H.V. Topping, (Editor), "Proceedings of the Third International Conference on Civil and Structural Engineering Computing", Civil-Comp Press, Edinburgh, UK, pp 151-157, 1987. doi:10.4203/ccp.4.18.1
In recent years offshore oil production structures have been posing new problems for designers. The tendency to design lighter and more slender tubular members and structures, revealing greater efficiency in the use of steel, makes buckling an important failure mode.

An efficient, theoretical model of cylindrical steel tubular members subjected to the biaxial bending moments combined with axial compression is presented. The model is based on the Influence Coefficient Method, as used for the analysis of the space behaviour and strength of long and intermediate length beam-columns. A more rigorous estimation of the buckling state of end-restrained imperfect tubular spatial beam-columns is achieved, used the constrained displacement length method. Within the requirements of engineering accuracy the load deflection paths of tubular beam-columns, under no-sway conditions, are determined permitting to examine their maximum strength and behaviour.

The validity of the analytical model is established by comparisons with results of an experimental study. The present method is suitable for use in the calculation of the effective length factors of tubular beam-columns with end-restraints, initial imperfections, eccentricities of the loading and residual stresses.

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