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Charakterystyczne cechy sprężenia w obiektach gruntowo-powłokowych

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Michalski J. B. , Michalski B.

tom Nr 8

215-244

The aim of the paper is to draw attention to special features of tensioned corrugated soil-steel structure during construction and service. These features can be described through geometric measures of a deformed structure. Through analysis of those one can learn about the tensioned stage of the soil-steel structure including safety and effectiveness of tensioning. Deformation of a shell, during construction stage of a soil-steel bridge, is analyzed in this paper. Characteristic displacement is a vertical flexion in the shell key, defined as an uplift. This is considered to be the effect of shell compression. During exploitation, due to the influence of live loads, the shell deflects, which reduces the uplift and bending moments. This reduces flexural stresses in the shell, increasing safety of the structure. Thus the uplift of the shell has a positive effect, similar to prestressing of a concrete beam. Comparison of reactions and displacements of two completely different bridge structures shows similarity of their mechanical behavior, though type of prestressing is different. The results of comparative analysis of technological indices for prestressed, composite and soil-steel bridges are also given in the paper.