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

Cheng Haigen*, Jiang Weichao
School of Civil Engineering, East China Jiaotong University, Nanchang, Jiangxi, 330013, P.R. China.

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© 2015 Haigen and Weichao;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the School of Civil Engineering, East China Jiaotong University, Nanchang, Jiangxi, 330013, P.R. China; Tel:!13879104029; E-mail:


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.

Keywords: Composite T-girders, longitudinal stress, differential equations, shear lag coefficient, steel-concrete.