The objective of this paper is to propose a simplified procedure for estimating the degree of imperfection in the incomplete composite beam with fixed ends under the uniform load. The degrees of imperfection concerning the longitudinal force, horizontal shearing force, deflection and the moment inertia of the section of the beam are estimated by using the logarithms plot between the rigidity of shear connectors and the parameter composed of the sectional properties and the beam span, which is derived by solving the differential equation of the incomplete composite beam.
