No 1 (2017)

ПОЗДРАВЛЕНИЕ РЕКТОРА РУДН Поздравляем главного редактора журнала Строительная механика инженерных конструкций и сооружений (Structural- Mechanics of Engineering Constructions and Buildings)проф. С.Н. Кривошапко, коллектив редакционной коллегии и редакционный совет журнала с присуждением премии INTERNATIONAL GOLD STAR FORQUALIT Yintherea Imof Customer Satisfaction, Innovation and Technology as established in the QC100 TQM model. Желаю всему коллективу дальнейших успехов в работе и надеюсь, что журнал внесет достойный вклад в реализацию Программы стратегического развития РУДН. Ректор РУДН Академик РАО В.М. ФИЛИППОВ

Having taken curvilinear coordinates on the middle surface of shells in the lines of principle curvatures, we can determine the simplest system of 17 governing equations of the linear theory of shells. But sometimes, the problem of analytical determination of the equation of the middle surface in lines of principle curvatures is very difficult task and that is why it is necessary to use the system of 20 governing equations, derived by A.L. Goldenweiser for an arbitrary system of curvilinear coordinates with taking into account the condition of decomposition of the vectors of internal forces and moments and external surface load along the axes of the basic non-orthogonal moving trihedral. Later, the system of 20 governing equations, derived by the author, was published. These equations contain internal force factors and external surface load decomposed along the axes of the basic orthogonal moving trihedral. His paper shows that these both systems of governing equation can transform one into other with the help of the equations of translation, i.e. the both systems of governing equations are equivalent.

Results of a study of thermal power efficiency performed by thermal insulation of enclosing structures of a building of the Peoples' Friendship University of Russia are presented. As a result of thermal imaging survey, the thermal power efficiency of thermal insulation on the technology of ventilated facade is assessed, as well as the areas with high thermal radiation are identified.

The paper considers the development of an analytical model for long-term deformation of a reinforced concrete element with corrosion damage in plane stress state at the contact area between concretes of various grades on the basis of known stress-strain relations and parameters for reinforced concrete in a complex stress state with cracks. The derived flexibility matrix elements allow for taking into account long-term deformation, corrosion damage and shear in contact area between concretes of various grades. The authors give an example of a layered reinforced concrete beam calculation. The results of the calculation have been compared with an experimental study data.

Currently, the Russian rivers created by hydro, ensuring the solution of a large number of tasks that combine issues of livelihood and work of major industrial regions of the country. These facilities have significantly changed the natural regime of rivers and surrounding coastal areas. One of the main problems encountered during the construction and operation of hydro - negative channel processes downstream such as washouts and riverbeds destruction shores. Today this task is urgent, and even acute in some areas. However, some issues of erosion of banks and the reorganization of riverbeds downstream waterworks and their impact on the environment is not well understood. When activated, the lateral erosion develops general erosion processes with heterogeneous composition of sediments. In urban areas there is a risk of contamination of river water and coastal areas, damage to pipelines, dams collapse, flooding and inundation of large areas. The study and assessment of the extent of the dynamics of channel processes, allows us to develop recommendations, methods of forecasting and regulatory relief in order to prevent the negative consequences. It is necessary to solve problems that are important for the protection of rivers and coastal areas, and for the proper functioning of the industry and maintain the security of life of the population in such areas. The research of deformation shores downstream waterworks (for example, Rybinsk), a laboratory model at different levels of releases. The simulation showed that the strain is directly dependent on expenditures. However, if there is a permanent presence of transit charges, and it will be gradually added to the cost of other sources, the strain will be considerably less than the sudden release of water without transit.