Influence of Bending-extension Coupling on Buckling of Composite Columns

Stability aMlysis 0/ lambuUed composite columns with bending-mension coupling is pr~. sented. PnVioIU work by other authors considered tluzt the stability 0/ th~ colum" is govemedby a symmetric bifurcation andusedG " redueed bending stil/ness. " A p~rturbation tUUJlysLt is employed in this work to investigau 1M primary equilibrium path using linear, fUtUlratie, and cubk tlpproxinUltions. Equilibrium antl slilbility 0/ the colum" is studied using the toIIIlpountial eM,." ¥ProtlCh. The results show that bendillg-enension coupling causes a nonstnJight prebuckling equilibrium path. No critical states tu. deucted along G cubk path, thus excluding the possibi1ity 01 bifurcaJion into G hal/-WtlJ1. mod~ or illto G one-wave mode shape.