Abstract
In this paper, two analysis models, a uniform shear warping model and a nonuniform shear warping model for the thin-walled beam's flexural behavior are developed, which can show the precise distribution of normal stress and shear stress within the beam section including the shear lag phenomena. The mechanism of boundary condition of the developed shear warping models and their relation for the Timoshenko's beam model are discussed and clearly verified. By using the St. Venant's semi-inverse method, the uniform and nonuniform warping functions are defined. By two examples, the usefulness of the proposed analysis model is shown.
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