engleski

Influence of the shear force and distributed load on the longitudinal ultimate strength

This paper considers assessment of the ultimate bending capacity, i.e. ultimate limit state evaluation in the concept design of the monotonous thin-walled structures predominantly subjected to vertical bending loads during their exploitation. Using an proposed progressive collapse analysis method based on Smith’s approach, various relevant effects of the shear force Q(x) and distributed load q(x) are incorporated into the ultimate bending moment assessment resulting with more sophisticated evaluation of the ultimate bending capacity and more accurate and reliable identification of the critical cross section. Influence of the (ultimate) shear capacity on the (ultimate) bending capacity is discussed, along with the various aspects of the considered problem. Accuracy of the considered approach is discussed and demonstrated on example of the thin-walled box-girder and detailed comparison of the results obtained by the proposed approach and nonlinear finite element method analyses is given.

Longitudinal ultimate strength; Warping; Progressive collapse analysis

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