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A characteristic feature of the soil-steel structure, unlike conventional bridges, is greatly infl uenced by the backfi ll ground and the road surface as a load-bearing elements. In the model of soil-steel structure there are two structural parts: steel shell with corrugated pates and backfi lling ground with road surface. The interaction between them is modeled as an contact interaction (interface), which is a normal and tangential force to the surface of the shell. These normal interactions are variable during the construction phase as well as during operation. In this paper the collocation condition is use to determine these interactions, based on the fact that the calculation result obtained from the model of the geometry of the shell is to be consistent in the result of the measurement of the movement of the collocation point in real structure. The physical characteristics of the soil in layers of backfi ll and especially the technology of laying and compacting is to taken into account and this is the advantage of this algorithm. The results of these analyzes can be the basis for comparing the eff ectiveness of conventional geotechnical models.

Estimation of the interaction effects of backfill on the shell in the soil-steel structure based on deformation of the shell