A sereis of formulae is proposed for predicting the buckling coefficient of a web plate on the launching shoe which is practicized during the girder erection process with the launching (or push out) method. The formulae are established from the authors' FEManalyses on the patch loaded web plate, and the magnitude of the in-plane bending moment, shear force and so on can be took into the account. Through the formulae, the estimation of the buckling strength of a web plate on a launching shoe can be made easily.
