No 2 (2011)

Researches of parametres of the air environment indoors for the purpose of definition of influence of the conditioner of type Split-system on air exchange are conducted.

In this paper offered a new method for forecasting the condition of reinforced concrete pipelines, which are located under the roads. It has a practical value in the absence of special diagnostic equipments and robotics.

Design techniques with use of mathematical package MathCAD of following parametres of wind action are presented: fundamental basic wind velocity, directional factor, structural factor and value of wind force (wind pressure).

The results of research of operational reliability of the process of construction of monolithic reinforced concrete walls in the inventory folding large formwork are presented. It is established that the main factor in reducing the infallibility of industrial equipment is the careless attitude of the production staff.

Analysis and design of device for reduction of harmful pressure oscillations is described in this article. Is used characteristics method with constant time step.

The article presents the results of theoretical and experimental research which allow to give engineering-based recommendations about determination of wave characteristics in interaction with local side narrowing of the riverbed and improve methods of calculation and designing of hydraulic and engineering objects, water supply and drainage system.

The results of computer modeling of the behavior of shear walls of a building under the action of explosion loads are presented in this paper. The modeling was performed with the ANSYS software. Comparative analysis of two types of shear walls is carried out: ordinary reinforced concrete shear walls and composite shear walls with the external reinforcement of high-strength low-alloy steel plate.

The article concerns the questions of forming of the modified Coon's surfaces with inclined plane or space curved support lines on four angle plan. Using the inclined curved lines as support lines for construction of modified Coon's surfaces allows to receive many new forms of space constructions. There regards questions of erecting of the space lines on given curved four angle plan. There shown drawings of modified Coon's surfaces made with the help of 'MathCad' system.

The results of experimental researches on load-carrying ability determination of eccentrically compressed columns of medium and great flexibility were analysed and generalized. Test procedure of the load-carrying ability of the eccentrically compressed columns for condition of strength and stability taking into consideration the real properties of the materials was improved.

The problem of synthesis of control system is considered. It is shown that classical statement of the problem does not provide satisfactory quality of control. The corrected statement of the problem where solution guaranties high quality of control for any initial conditions is proposed.

It has been studied how semi-synthetic motor oil affects the polarization of polyvinyl chloride samples. It has been defined that the oil components influence the process of polyvinyl chloride polarization. We have showed that the input and exhaust motor oil contains polar components which bring to the density growth of the polyvinyl chloride charge being guided by the electric field direction. The injected charges initiate a chemical interaction of oil components. The water higher rate containing in the exhaust oil is reflected in the parameters of charge density of the samples, as well as of the activation energy of the electrically active defects.