No 1 (2012)

Problems of strain concentration and distribution of displacements around the contour of underground structures which are located in anisotropic and transverse isotropic rock massif are solved with numerical solution based on boundary integral equations.

The normal stress distribution due to the axis variable force is determined in the concrete and in reinforcement. The creep and structural damages are accounted. The solution the corresponding relaxation problem is based on the quasi-linear rheological state equation.

The results of calculations of stress-strain state of steel-and-reinforced concrete pressure water pipes of the hydro station are presented. It was made with the help of a method of numerical modeling derived by the author. Numerical results were compared with experimental data obtained before.

The system Maple is used to solve the statics problem of an elastic space statically determinate truss. The algorithm of calculation is given. The inductive method of obtaining solutions for an arbitrary number of rods in the farm is used. The relation of the height of the truss on the length detected the value, for which the deflection increases indefinitely. Optimal truss size is found.

The paper contains a method of calculation of seismic isolation for building on hard suspend. The straight numeral method with discrete and step realization by electronic table Excel was used.

In this paper the problem of modeling the movement of the linear system under the influence of determined and stochastic parametric load had been studied by the example of cable-stayed girder. The aerodynamic stability of similar systems had been analyzed. There are two cases compared when pulsation wind component is Gauss random stationary process with a spectral density of Davenport, and spectral density of Kaimal.

There was made a comparison in this article of rolled metal thin-sheet profiles arch's behavior features, which was loaded with standard wind load on the one hand and with load, obtained by means of computer modeling on the other hand. The research was carried out in the following sequence: first of all there was made a substitution of the metal thin-sheet profiles U-formed arch for the plain arch with an equivalent flexural rigidity, then the load of the arch with wind load in compliance with the calculating data of the wind flow in the virtual wind tunnel and finally execution of analysis and comparison of final results. The arch modeling as well as the virtual wind tunnel modeling was based on the Solid Works software package by means of the method, stated in the previous publications. The theoretical and methodological basis of the research is the Navier-Stokes equation and the equation of the condition of the fluid medium's components. The results are the differentiation of three pressure zones on the arch, depending on wind trajectory and speed, as well as the comparison of the maximal redial arch shifts under two types of wind loads.