A solution for laminated box beams under bending loads using the principle of complementary energy

In this paper, based on the principle of complementary energy, the formulas for calculating the bending stresses, deflection and shear lag effect of the symmetric single-cell thin-walled composite laminated box beams are derived by means of variation calculus. The numerical analysis shows that the procedure in this paper has simple and reliable characteristics and provides a new approach for the practical calculation of laminated box beams under bending loads.