Analytic Solutions of Shear Lag on Steel-Concrete Composite T－girder under Simple Bending

The composite T-girders include concrete flange plates and steel beams, which are connected by shear connectors. The longitudinal stress about concrete plate is due to non-uniform distribution on cross section because of the shear lag effect. A differential equation of longitudinal forces at transverse section flange and cantilever flange is separately established according to the strain compatibility and the force equilibrium conditions about a composite T-girder. The method of separation of variables is used to solve the differential equation about the simply supported composite T-girder. The shear lag coefficient is detrmined by the ratio between stress calculated by this method and stress odetrmined by elementary beam theory. An example of such calculation is given to approve its applicability.

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