Composite-oriented Variable Section Design and Buckling Strength of Long Columns

Abstract

The elastic compressive buckling loads of composite-oriented designed long columns which have hollow variable sections and are simply supported at both ends were analyzed. As column shapes, three types of linearly tapered, parabolic and sinusoidal shapes were taken into consideration. The fabrication of such cylindrical columns with variable diameter and variable thickness are reasonably carried out with unique tailor-made feasibility of fibrous composites. It was assumed that the sectional area of each column is constant over its whole length and some dimensional restrictions were introduced in order to prevent the local wall buckling and to understand its merits concretely. The Euler type buckling loads for various columns were analyzed by FEM. It was found that the variable section column designs give higher buckling strength than straight uniform section designs and suggest favourable weight saving.