The paper considers the problem of optimization of the rectangular box section of the double beam bridge crane. Reduction of the girder mass is set as the objective function. The constrained optimization applied in Matlab Optimization Toolbox was used as the methodology for determination of optimal geometrical parameters of the rectangular box section. The criteria of permissible stresses, local buckling of plates, static deflection, permissible period of oscillation, minimum plate thickness and production feasibility were applied as the constraint functions. Verification of the used methodology was carried out through numerical examples and the comparison with some existing solutions of cranes was made. Numerical result shown that the mathematical model of optimization was exact and the algorithm effective.

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