No 6 (2016)

The new forms of building structures are widely used for modern social buildings, exhibi- tion pavilions, sport and industrial erections. The possibility to create new forms of thin space shell structures on the base of normal cyclic surfaces is considering in the paper. The thin- walled shells formed by the system of the circles as well as by the system of right lines are the mostly comfortable for the erection on the building sites or for formation of the details of the structures. The normal cyclic surfaces are allowed to construct many different forms of the space structures. It is possible to create new space structures on the base of cyclic surface with combination of cylindrical or other surfaces.

The author researches the stress-strain state of a single-storey brick building with an internal partition under static pulling load in the overlap level, and the impact on the strength of having a wooden frame construction in the supporting walls

An alternative method of displacements is introduced into the theory of so-called forecast internal energy losses. This theory is inevitably accompanied by the alternating sign of force loading for structural building materials. Previously, the author proposed the methods of evaluation for such energy losses basing on the level of the stress state. In contrast to these methods new method is looking for a difference of work of loading and unloading forces for displacement designs.

In the paper, a problem of natural vibration of a bar inhomogeneous in thickness and length made of different modulus material and lying on two Pasternak -type foundation is considered. The equation of motion is the fourth order complex partial differential equation. The solu- tion of the problem is constructed by means of method of operation of variables and of the Bubnov - Galerkin orthogonalization method. At specific values of characteristic parameters, the calculation in conducted and the results are represented in the form of tables and graphs of dependence between annular frequency and inhomogeneity parameters The results of calcula- tions show that account of inhomogeneity of elasticity modulus density and also mediums resistance essentially influences' on the value of annular frequency.

The results of calculations of the stress-strain state of iron Cable holder (console) type of CCHI used in the cabling to pass wells with the use of a complex of programs «Ansys». Theo- retically, the possibility of reducing the number of characteristic size (thickness of the bed, the thickness and shape of ribs) while retaining the strength characteristics of standard parts, which can significantly reduce the weight of the product, and therefore the cost of manufac- ture is confirmed.

This study is part of the development of a model of hydraulic calculation of controlling reserves control in drinking water supply systems. To that end, the general expressions of the cumulative curves of gravity water supply and pumped water supply as well as the ones of the distribution over time were formulated. It appears from this study that for a peak coefficient Kp between 1.2 and 1.4, the cumulative consumption evolves linearly and for Kp ranging from 1.45 to 2.5 the cumulative consumption follows a polynomial curve of degree 3. Then, there is a relationship between the respective totals of gravity water supply and pumped water supply and the total of the cumulative consumption, which superimposed have enabled the establish- ment of the mathematical model for determining the volume of the controlling reserves.