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Abstract. The paper is devoted to the problem of definition of availability index of deforming building construction in atypical cases. The authors revealed a real applicability of the finiteelements analyses package, such as ANSYS, for engineering testing calculations of building constructions and determination of the sites of increased stresses. It was determined that stresses increased up to 7.75 times in the sites with mechanical defects (for steel crane girder); also, the authors revealed the convergence of the calculation results between the finite element method and a usual decision using the strength of materials (in the limits 2-14% for steel truss frame). The equivalent stresses don't exceed the maximum permissible tension for this type of steel. The building constructions have a limited availability index.

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The article deals with experimental research results of reciprocal influence of neighbouring foundations of an existing building and a constructed one on a sand base using their models. The authors determine the distance between them at which sheeting is rational and choose the optimal sheet pile embedment length. The authors conclude that the interaction between the stamps modelling the foundations ceases when the distance between them is more than 2b (b is the foundation width). And when the distance is equal to 2b the best protection from that reciprocal influence is provided by embedding of the sheeting to the depth of 4b.

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