Global buckling of composite laminated box beam

摘要

Based on the theory of first-order shear deformation beam,the equivalent constitutive Eq.of composite laminated box beam is established.The analytical formula of equivalent bending stiffness and equivalent torsional stiffness characterized by the stiffness coefficient of laminated plates are derived.The critical loads of bending instability and torsional instability are obtained by solving the integral buckling equilibrium differential Eq.of composite laminated box beam under axial load.The variation of critical load under different ply layers and different ply angles is analyzed.