Abstract
Stability analysis of laminated composite columns with bending-extension coupling is presented, Previous work by other authors considered that the stability of the column is governed by a symmetric bifurcation and used a “reduced bending stiffness.” A perturbation analysis is employed in this work to investigate the primary equilibrium path using linear, quadratic, and cubic approximations. Equilibrium and stability of the column is studied using the total potential energy approach. The results show that bending-extension coupling causes a nonstraight prebuckling equilibrium path. No critical states are detected along a cubic path, thus excluding the possibility of bifurcation into a half-wave mode or into a one-wave mode shape.
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