The basic principles of the normal sections calculation of reinforced concrete and fiber reinforced concrete bending elements are considered. In the article the power and deformation methods of calculation of reinforced concrete and fiber concrete elements of rectangular cross-section are presented. The deformation model of the calculation of reinforced concrete and fiber concrete elements is presented in the framework of the method of calculation resistance of the section. This method makes possible from the common methodological positions to perform calculations of reinforced concrete and fiber concrete elements. Namely, to select reinforcement and to determine the carring capacity. The proposed deformation model for calculating fiber concrete elements is based on generally accepted preconditions. A hypothesis of plane cross sections is accepted as fair. The deformation diagram of compressed concrete is described by a nonlinear function with established parametric points. Distribution of stresses in stretched concrete is taken rectangular with corresponding coefficients which are taken depending on the type of deformation diagram. Determination of the carring capacity of fiber concrete elements occurs under extreme deformation criteria. Two cases of destruction of the investigated elements are considered. The first case is the destruction due to the achievement of limiting deformations in the concrete of the compressed zone with the simultaneous achievement of the fluidity limit in the working reinforcement. The second case is the destruction due to the achievement of limiting deformations in the concrete of the compressed zone without reaching the fluidity limit in the working reinforcement. Both cases of calculation are reduced to one functional dependence. This avoids the delimitation of different calculation cases. The main no dimensional modifier is the mechanical coefficient of reinforcement. According to the developed method, examples of calculations of reinforced concrete, fiber reinforced concrete elements and fiber concrete elements with longitudinal reinforcement are executed. The possibility of a spread variant design of reinforced concrete and fiber concrete elements is shown.

расхода водослива с щироким порогом в области малых напоров. Вестник МГСУ, 2013. №4. С. 167-171. Рязанцев А.И. ИСПОЛЬЗОВАНИЕ ВОДО-СЛИВОВ С ШИРОКИМ ПОРОГОМ В ВОДНЫХ ОБЪЕКТАХ ЛАНДШАФТНОЙ АРХИТЕКТУРЫ. В работе рассматриваются вопросы расчета водосливов с широким порогом для случаев их использования в объектах ландшафтной архитектуры. Ключевые слова: водослив с широким порогом, водослив практического профиля, малый напор, коэффициент расхода, ландшафтная архитектура.

Regulation of surface runoff in urban areas with temporary delay by infiltration basins of rainwater in the places of their precipitation and with gradual drainage through the existing reservoirs of small diameters is the most appropriate under the conditions of intensive building development, wear and imperfection of surface drainage systems, especially combined sewerage. Evaluation of application conditions and basic parameters of infiltration basins in surface drainage regulation was carried out on the basis of own experimental studies of infiltration basin fragment with upper typical vegetation layer, numerical computer modeling of surface runoff formation in urban areas, its regulation using infiltration basins and analysis of previous studies. Its water absorption, filtration and clearing indicators were defined on the basis of experimental studies. The self-regenerative restoring function of a vegetative layer, working conditions under the flooded and not flooded conditions were established and defined. According to the amount of suspended solids, BOD, oxidation, pH and dissolved oxygen, the quality of rain runoff when filtering water through the upper vegetation layers of infiltration basins decreases to the normative values.

The results of the theoretical analysis of the turbulent movement of water in pipelines are given. It is proposed to evaluate the parameters of turbulent flows based on the indicators of molecular and turbulent viscosity with the introduction of the conditional relative thickness of the boundary layer into the calculations. The dependencies of the logarithmic law of the distribution of averaged velocities in the cross-sections of pipelines have been clarified. Unlike similar formulas of the semi-empirical theory of turbulent motion, they correspond to the boundary conditions on the pipeline wall. New theoretical dependencies between the main parameters of turbulent flows in pipelines were obtained. It is proved that the magnitude of the coefficients of hydraulic friction is determined by two parameters: the conditional relative thickness of the boundary layer and the proportionality factor, which takes into account the change in tangential stresses in the turbulent flow. The adequacy of the obtained dependencies is confirmed by their correspondence to the experimental data of the hydraulic dependencies of turbulent flows, on the basis of which the current standards for hydraulic calculations of water pipes were developed. For hydraulically smooth pipes, an explicit dependence was obtained for hydraulic friction coefficients in a wide range of Reynolds numbers (from 7 10³ to 10⁷). It almost completely corresponds to the well-known Prandtl-Colebrook’s formula, which has an implicit form. Numerical values and analytical dependencies between parameters of turbulent flow in hydraulically smooth pipelines are determined. It was established that with an increase in the Reynolds number, the values of both the conditional and absolute thicknesses of the boundary layer decrease, and with the increasing of the pipe diameters, they grow. It is shown that the thickness of the boundary layer depends on the type and magnitude of the roughness of the inner surface of the pipes and it is decisive when other parameters of turbulent flows in pipelines are evaluating.

20. Олійник О.Я. Моделювання і розрахунки біоло¬гічної очистки стічних вод на краплинних біофільтрах/ О.Я. Олійник, О.А. Колпакова // Екологі¬чна безпека та природокористування.-К., 2014.-Вип.16.-С.68-86. Олейник А.Я., Айрапетян Т.С. РЕКОМЕН-ДАЦИИ К ОПРЕДЕЛЕНИЮ ПАРАМЕТ-РОВ ДЛЯ РАСЧЕТА КИСЛОРОДНОГО РЕЖИМА В АЭРОТЕНКАХ С ПРИКРЕП-ЛЕННЫМ БИОЦЕНОЗОМ. Для аэротенков c прикрепленным и взвешенным биоценозом представлены рекомендации для определения параметров и коэффициентов для расчета процесса окисления органических загрязнений с учетом кислородного режима. Данные рекомендации позволяют пользоваться разработанной инженерной методикой для расчета аэротенков усовершенствованной конструкции и определять лимитирующие факторы. Ключевые слова: кислородный режим, аэротенк, активный ил, прикрепленная биомасса (биопленка), концентрация загрязнений и кислорода, исходные параметры, расчет, оценка, анализ. Oleynik A.Ya., Airapetian T.S. RECOMMENDATIONS FOR THE DETERMINATION OF PARAMETERS FOR THE CALCULATION OF THE OXYGEN REGIME IN AERO-TANK-MIXERS WITH ATTACHED AND SUSPENDED BIOCENOSIS. For aerotanks with an attached and suspended biocenosis, recommendations are given for determining the parameters and coefficients for calculating the process of oxidation organic pollutants including the oxygen regime. These recommendations allow you to use the developed engineering methodology for the calculation of aerotanks of an improved design and to determine the limiting factors.