Current revision of the fundamental Eurocode for design of civil engineering structures

Vestnik MGSU 9/2018 Volume 13
  • Marková Jana - Klokner Institute, Czech Technical University (CTU), in Prague, 7 Šolínova, Prague 6, 166 08, Czech Republic ssociated Professor; ORCID ID 0000-0002-9674-0718, Klokner Institute, Czech Technical University (CTU), in Prague, 7 Šolínova, Prague 6, 166 08, Czech Republic, 7 Šolínova, Prague 6, 166 08, Czech Republic.
  • Holický Milan - Klokner Institute, Czech Technical University (CTU), in Prague, 7 Šolínova, Prague 6, 166 08, Czech Republic Professor; ORCID ID 0000-0001-5325-6470, Klokner Institute, Czech Technical University (CTU), in Prague, 7 Šolínova, Prague 6, 166 08, Czech Republic, 7 Šolínova, Prague 6, 166 08, Czech Republic.
  • Sýkora Miroslav - Klokner Institute, Czech Technical University (CTU), in Prague, 7 Šolínova, Prague 6, 166 08, Czech Republic Associated Professor; ORCID ID 0000-0001-9346-3204., Klokner Institute, Czech Technical University (CTU), in Prague, 7 Šolínova, Prague 6, 166 08, Czech Republic, 7 Šolínova, Prague 6, 166 08, Czech Republic.

Pages 1036-1042

The present, globally-applicable revision of the fundamental EN 1990 Eurocode for the design of buildings and civil engineering structures is briefly summarised. General requirements are further elaborated with respect to structural resistance, serviceability and durability. In addition, provisions for robustness, sustainability and fire safety are included. An appropriate level of structural reliability should consider the consequences and possible causes of failure, public aversion and costs associated with reducing the risk of failure. However, the choice concerning the reliability level is left to national interpretation. The target reliability indexes are indicated for one-year and 50-year reference period, with no explicit link to the design working life being provided in the final draft of prEN 1990. It is proposed that the consequences of structural failure be organised into five categories; however, without providing recommendations on the target reliability indices for the lowest and highest consequence class. Supplementary guidance on structural robustness is proposed in prEN 1990, Annex E. A structure should have a sufficient level of robustness that it will not be damaged to an extent disproportional to the original cause. The working life design should be considered for time-dependent performance of the structures. Ultimate and serviceability limit states should be verified for all relevant design situations. Apart from the commonly-used partial factor method, which comprises a basic method for structural verification, additional guidance is also given for application of non-linear methods. The partial factors have been newly-calibrated with the aim of achieving a more balanced reliability level for structures from different materials and loading effects.

DOI: 10.22227/1997-0935.2018.9.1036-1042

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PREDICTION OF REMAINING SERVICE LIFE OF ASPHALT PAVEMENTS

Vestnik MGSU 3/2018 Volume 13
  • Kirillov Andrey Mikhailovich - Automotive-road college Candidate of Physical and Mathematical Sciences, Lecturer, Automotive-road college, 5 Chekmeneva st., Sochi, 354051, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Zavyalov Mikhail Aleksandrovich - Lomonosov Moscow State University Doctor of Technical Sciences, Associate Professor, Faculty of Global Processes, Lomonosov Moscow State University, 1, bdg 51, Leninskie Gory, Moscow, 119991, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 356-367

Subject: methods for predicting the remaining service life of asphalt pavements based on development of pavement’s functional state model and established threshold values of benchmark parameters for each level of pavement degradation. Research objectives: substantiate the method for predicting the remaining service life of asphalt pavements based on the uniformity of their specific heat values. Materials and methods: the application of the uniformity of the specific heat values of pavement and the index of thermophysical uniformity as criterion parameters, was demonstrated. Results: the use of approximating function describing the evolution of the index of thermophysical uniformity to assess the current condition of pavement and to predict its further deterioration is justified; calculation formulas were obtained to determine the remaining service life of pavements. Conclusions: methods for determining the remaining service life of asphalt pavements are proposed. Knowledge of the remaining service life should facilitate strategic decision-making with regard to required road repair and maintenance, and thereby lead to a more efficient use of existing resources.

DOI: 10.22227/1997-0935.2018.3.356-367

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Environmental assessment of a city on the model of energy-ecological efficiency

Vestnik MGSU 12/2014
  • Kuzovkina Tat’yana Vladimirovna - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Construction of the Objects of Thermal and Nuclear Power, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; +7 (495) 781-80-07; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 172-181

This article gives an overview of the analytical methodology for assessing the environmental safety in construction, the existing government programs in energy saving, and the analysis of the actual state of the investigated problem, proposed a method of assessment of environmental safety efficiency criteria of a city. The analysis is based on the data on housing and communal services of the City of Moscow. As a result of the consideration of the government programs and methods of assessing the environmental security in construction the conclusion was made that none of the programs reviewed and non of the methods include consideration of the relationship between environmental parameters of environmental security and energy efficiency (indicators of them are considered separately from each other). In order to determine the actual state of environmental safety analytical review was performed of energy efficiency programs of the government in Moscow and the methods of assessing the environmental safety of a construction. After considering a methodology for assessing the environmental safety of a construction, the author proposes to use the model for determining the indicator of efficiency of the city to ensure the environmental safety of the processes of life-support of the city, which takes into account the dependence of the parameters of environmental safety and energy efficiency. The author describes the criteria for selecting thr data on energy and environmental efficiency of the city. The article shows the sequence to identify the criteria for determining the indicator of efficiency of the city. In the article the author presents the results of ecological assessment of Moscow on the energy-ecological efficiency model, using the model defined performance indicators of the city to ensure environmental safety processes of life support of the city. The model takes into account the dependence of environmental safety parameters, environmental and energy efficiency. The correlation analysis of the effectiveness of the city of Moscow, the graphs for the regression assessment models of the data are described. The coefficient of efficiency indicators correlation of city support and the coefficient of life safety in the city are calculated. Performance indicator for Moscow in 2009-2012 is defined, which reflects the dependence of the processes of life support and life sustenance of the city. The proposed approach to the assessment of environmental safety may be used in the development of governmental programs on energy saving, as well as in the preparation of regulatory documents.

DOI: 10.22227/1997-0935.2014.12.172-181

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Thermal regime of enclosing structures in high-rise buildings

Vestnik MGSU 8/2018 Volume 13
  • Musorina Tatyana A. - Peter the Great St. Petersburg Polytechnic University (SPbPU) postgraduate student, Hydraulics and Strength Department, Peter the Great St. Petersburg Polytechnic University (SPbPU), 29 Politechnicheskaya s., St. Petersburg, 195251, Russian Federation.
  • Gamayunova Ol’ga S. - Peter the Great St. Petersburg Polytechnic University (SPbPU) Senior lecturer, Department of Construction of Unique Buildings and Structures, Peter the Great St. Petersburg Polytechnic University (SPbPU), 29 Politechnicheskaya s., St. Petersburg, 195251, Russian Federation.
  • Petrichenko Mikhail R. - Peter the Great St. Petersburg Polytechnic University (SPbPU) Doctor of Technical Sciences, Professor, Head of the Hydraulics and Strength Department, Peter the Great St. Petersburg Polytechnic University (SPbPU), 29 Politechnicheskaya s., St. Petersburg, 195251, Russian Federation.

Pages 935-943

Subject of research: the main heat loss occurs through the building fence. In the paper, the object of research is enclosing structures with different thermal conductivity. The problem of moisture accumulation in the wall is quite relevant. One of the main problems in construction is saving on building materials and improper design of building envelope. This in turn leads to a violation of the heat and humidity regime in the wall. This paper presents one of the methods to address this issue. Purpose: description of heat and humidity conditions in the wall fence of high-rise buildings. It is also necessary to analyze the relationship between the thermophysical characteristics. Materials and methods: the temperature distribution in the layers will be analyzed on the basis of the structure consisting of 10 layers; the layer thickness is 0.05 m. Materials with different thermal conductivity were used. Each subsequent layer differed in thermal conductivity from the previous one by 0.01. Next, these layers are mixed. The calculation of the humidity regime includes finding the temperature distribution along the thickness of the fence at a given temperature of the outside air. The quality factor of the temperature distribution is the maximum average temperature. This research are conducted in the field of energy efficiency. Results: the higher the average wall temperature, the lower the air temperature differs from the wall temperature. In addition, the higher the average temperature of the wall, the drier the surface inside the wall. However, moisture accumulates on the surface inside the room. The working capacity of multilayer enclosing structures is determined by the temperature distribution and distribution of moisture in the layers. Conclusions: moisture movement through the fence is due to the difference in the partial pressure of water vapor contained in the indoor and outdoor air. A layer with minimal thermal conductivity should be located on the outer surface of the wall in a multi-storey building. The maximum change in the amplitude of temperature fluctuations is observed in the layer adjacent to the surface by periodic thermal effects. It is also taken into account that the process of heat absorption has a great influence on the temperature change in the thickness of the wall fence to the greatest extent within the layer of sharp fluctuations (outer layer). The Central part of the wall (bearing layer) will be the driest. These calculations are satisfied with the design of the ventilated facade.

DOI: 10.22227/1997-0935.2018.8.935-943

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