Nonlinear Analysis of Flexural Behavior of Composite Materials Laminated Beam

In order to analyze bending whole process of composite laminated beam more accurately,considering nonlinear constitutive relation of various materials,a new laminated beam element was formulated based on classical lamination theory and finite element method.The laminated beam element stiffness equation was obtained.The bending whole process of a steel-concrete composite test beam and concrete beams strengthened with carbon under vertical load were analyzed by step loading method.It was validated by experiments that the calculated results of composite beam deflection had a good agreement with test results.It is concluded that this equation is rational and believable,and the equation provides a feasible design theory for practical engineering calculation,and the research provides a new method for theoretical research of composite beam.