Engineering structures stability against progressive collapse

The calculating stability of an engineering structure against progressive collapse is considered in this article. The calculations results are analyzed. A dangerous emergency scenario was developed and measures were developed to prevent the progressive building collapse in the structures local destruction in accordance with the regulatory documents requirements for such an object. The most dangerous design schemes are considered to assess the structure stability against progressive collapse. A scenario for calculating stability against progressive collapse in the case of local failure has been selected, and a consistent action algorithm has been obtained that makes it possible to perform a calculation for resistance to progressive collapse., The kinematic method of the limit equilibrium theory for structures with elastic-plastic materials properties is used to calculate the resistance to progressive collapse. It corresponds to the turning the system into a plastic kinematic chain, the links movement is carried out due to the plastic flow of the system's links. Two types of undamaged structures were identified to assess the building resistance to progressive collapse: neighbouring beams and columns, in which local destruction impact does not cause a qualitative change in the stress state, but leads to an increase in stresses and forces (neighboring beams, columns); pavement slabs resting on a beam and welded through embedded parts to a beam that has lost its original support, and located above a local fracture, the stress state changes. The conclusion is made about the requirements that should be met in order to conclude the calculation justification so it can be said that resistance to progressive collapse is ensured. It has been established that the calculations performed confirm the object stability - the drainage chamber to progressive collapse in the local destruction as an emergency situations result

Mathematical modeling of groundwaters pressure distribution in the underground structures by cylindrical form zone

A mathematical model is developed for studying the distribution of groundwater pressure and its variation in the zone of underground structures of a cylindrical shape. Based on the created model, the influence of the thickness of the aquifer, the soil porosity, the filtration coefficient, the viscosity coefficient and the piezoelectric conductivity coefficient on the pressure that groundwater exerts on the lower part of the underground structure is investigated. The analysis of the possibility of pushing the structure and breaking the foundation under the influence of pressure caused by groundwater is analyzed. Analytical formulas are obtained for estimating the stresses in the foundation and predicting the possibility of its destruction

University Rankings

The article gives the analysis of university rankings and defines the differences in evaluation methods and indicators of world ranking agencies, presents new approaches to making global rankings. It defines the position of MGSU in Russian universities TOP-100 ranking. University rankings are not simply information, but the evaluation instrument of quality of education, initiating the improvement of ranking position. It’s important for Russian Universities claiming for higher positions in the world rankings. MGSU position in universities ranking made the University administration consider thoroughly the University positioning in the system of higher education, in the categories of education and science and among possible employers of the university graduates

Indoor air quality requirements for civil buildings in russian regulations in comparison with international green standards

A new trend combining the concept of "green" buildings with the idea of preserving and strengthening peoples’ health in order to eliminate sick building syndrome and building related illnesses has been observed worldwide. The COVID – 19 pandemic consequences outlined the necessity of updating the regulatory framework considering health preserving built environment principles in order to create sustainable and comfortable living environments. Indoor air quality directly correlates with human health: exposure to polluted air increases the risk of cardiovascular disease, myocardial ischemia, angina pectoris, hypertension and heart disease. It is known that indoor air quality depends not only on ambient air quality, but also on indoor sources of chemical and biological pollutants. Existing regulatory framework does not cover the civil buildings indoor sources of air pollution topic. This article discusses the terms of the Russian national technical and hygienic standards concerning the indoor air quality. A comparative analysis of the Russian Federation regulatory framework that refers the civil buildings indoor air quality with international "green" standards was carried out. Based on the analysis, the necessity to update the Russian regulatory framework is highlighted