This paper introduces the theoretical,experimental and finite element method results investigations of sinusoidally and trapezoildally corrugated webs I-section girders.The linear elastic and non-linear inelastic behaviors of these I-girders are considered,in which the in-plane bending moment,shear strength and out-of-plane flexural-torsionai buckling capacities are illustrated.Some proposed designing formulas for calculating and verifying these capacities are presented.