75504 2712-8172 4 22 2011 1-57

RAR RUS 5-9 Guchinsky Ruslan 6602693779 Peter the Great St. Petersburg Polytechnic University Petinov Sergey sergei.petinov@gmail.com

29 Politechnicheskaya St., St. Petersburg, 195251, Russia

Fatigue of Fillet-welded Joint Assessment by the FEA Simulation of Damage Accumulation Fatigue strength evaluation of non-continuous incomplete penetration fillet-welded joints transferring stress flow by the S-N criteria incorporating the «Hot-spot stress» or «Notch-stress» approaches is dubious since the characteristic stress at the crack initiation location is not established by the rules for fatigue design. Application of the linear fracture mechanics (LMF) technique meets a problem of numerical modeling the crack three-dimensional shape and front extension, which becomes insoluble when the crack approaches the outer surface of weld bead and propagates along the seam. Apart from that, considering material plasticity beyond the initial phase of crack extensions from the cavity is off the frames of the principles of the LMF. An approach based on the FEA simulation of fatigue damage accumulation is suggested and applied to evaluate the crack initiation at the cavity and propagation in the non-continuous fillet-welded joint. The crack initiation at the cavity, its three-dimensional shape formation and evolution are simulated taking into account the elastic-plastic cyclic deformation of weld material until almost complete failure of the joint. The results of analysis are in good agreement with published experimental data. 10.5862/MCE.22.5 fillet-welded joints fatigue of welded joints FEA-based simulation of fatigue strain-life criterion for fatigue fatigue damage accumulation technique https://engstroy.spbstu.ru/article/2011.22.1/ petinov_fatigue.pdf

RAR RUS 10-15 Peter the Great Saint Petersburg Polytechnic University, PRDI “Venchur” Ulybin Alexey ulybin@mail.ru

Polytechnicheskay, 29

On the Choice of Concrete Strength Inspection Methods of Ready-built Structures The classification of concrete strength estimation methods used in the inspection of buildings and structures is given. Instrumentation working hours, the cost of equipment and work performance for different methods are considered. Use requirements of nondestructive inspection methods for concrete strength estimation according to normative document are analyzed. The experimental data about measurement inaccuracy of different nondestructive inspection methods are given. Guidelines on the choice of concrete strength inspection methods for objects of the inspection of buildings are given. 10.5862/MCE.22.1 concrete strength nondestructive inspection methods inspection of buildings https://engstroy.spbstu.ru/article/2011.22.2/ ulybin_control.pdf

RAR RUS 16-21 M-6585-2013 6508103761 0000-0002-1196-8004 Peter the Great Saint Petersburg Polytechnic University Vatin Nikolai vatin@mail.ru

Polytechnicheskay, 29

Peter the Great Saint Petersburg Polytechnic University Petrosov Dmitriy dpetrosov@mail.ru

29 Politechnicheskaya St., St. Petersburg, 195251, Russia

CJSC “ProfTsement-Vektor” Kalachev A. Ramboll Lahtinen Pentti pentti.lahtinen@ramboll.fi Use of ashes and ash-and-slad wastes in construction The use of ash waste saves expenses on main materials without compromising the quality of the product, while solving the problem of disposal of ash materials. The aim of this work is classification of ashes and evaluation its use in construction. Classification of ash-and-slad wastes based on type of burned coal, way of incineration, flame temperature, way of ash disposal is made. The chemical composition and behavior of shale ash, its main deposits, its advantages as a mineral concrete admixture are analysed. Fly ashes are divided into siliceous ashes and basic ashes. Various application areas of ash-and-slad wastes in construction are considered, the examples of its use are given. 10.5862/MCE.22.2 concrete strength nondestructive inspection methods inspection of buildings https://engstroy.spbstu.ru/article/2011.22.3/ petrosov_zola.pdf

RAR RUS 22-25 ”NTTs ”Geotekhnologii SPB” Ltd Ustyan Nagapet nagapet_ustyan@mail.ru Geocontainers in road building and hydraulic engineering construction Geocontainers are structural loops made of high-strength geotextile. In the course of construction they are filled by ground or inert material on-site. The geomatrix is the next step in the development of geocontainers. It is the cellular structure made of geotextile, the cellules are connected by lacing or by thermal welding. The aim of the article is to acquaint the reader with this type of geomaterials, possibilities of its use in different areas of construction. The technology of using geocontainers and geomatrix in road building and hydraulic engineering is considered. Recommendations for its using in frozen soils and in swamps are given. 10.5862/MCE.22.3 geocontainer geomatrix geotextiles geosynthetic materials https://engstroy.spbstu.ru/article/2011.22.4/ ustyan_geocontainers.pdf

RAR RUS 26-32 CJSC «RSU-103» Slepchenok V. Group of companies «Sto Tretiy Trest» Petrakov Gennadiy p@103trest.ru Increasing the energy efficiency of thermal insulation of heat network pipelines in Northern and Northeastern regions of Russia For cities of Northern and Northeastern regions of Russian Federation located in harsh climatic conditions it is necessary to modernize the heat networks intensively to ensure economic efficiency and reliability of heat supply. The heating pipes with polyurethane foam insulation have a considerable advantage in comparison with other types of thermal insulation constructions; this is showed by service experience of existing heating systems. The article is about the analysis of the energy efficiency of increase the thickness of the insulating covering of heat pipes of the heat main line projected from the Apatity heat electropower station to the central heat station in the town Kirovsk of Murmansk region. The heat losses will decrease on 33 % in case of the use of steel pipes GOST 30732-2006 with thickened polyurethane foam insulation (with the carbon dioxide blowing). The heat losses will decrease on 7,3 Gkal/y. (7,8 millions of rubles in monetary terms in 2011 year) with increasing thickness of the insulation on 50 mm (from 85 mm to 135 mm). 10.5862/MCE.22.4 heat networks heat supply pipelines in polyurethane foam insulation energy saving energy efficiency heat losses https://engstroy.spbstu.ru/article/2011.22.5/ petrakov_teploizolyaciya.pdf

UNK RUS 33-39 Odessa National Polytechnic University Orobey V. Odessa National Polytechnic University Suryaninov Nikolay sng@mbei.opu.ua Substantive provisions of Numeral-analytical boundary elements method Substantive propositions of the new method of design calculation, that got the name "Numeral-analytical of boundary elements method", offered by authors, are brought. A method consists of development of the fundamental system of decisions (analytically) and Green functions (also analytically) for every examined task. For the account of certain border terms, or terms of contact between the separate modules (the separate element of the system is so named) the small system of linear algebraic equalizations, that must be decided numeral, is made. Discretisation only of border of the area occupied by an object, sharply diminishes the order of the system of resolvent equalizations; there is possibility of decline of regularity of the decided task. A method is strictly reasonable mathematically, as uses the fundamental decisions of differential equalizations, and, means, within the framework of the accepted hypotheses allows to get the exact meaning of parameters of task (efforts, moving, tensions, currents, frequencies of eigentones, critical forces of loss of stability et cetera) into an area. Simplicity of logic of algorithm, good convergence of decision, high stability and small accumulation of errors at numeral operations, are marked also. 10.5862/MCE.22.6 boundary element method finite elements method Havesaid function Cauchy problem spline-function fundamental functions https://engstroy.spbstu.ru/article/2011.22.6/ suryaninov_MGE.pdf

RAR RUS 40-47 Institute of Mechanics and Seysmic Stability of Structures Usarov M. umakhamatali@mail.ru The problem of bending the thick orthotropic plate of three-dimensional formulation Usarov, M.K. The problem of bending the thick orthotropic plate of three-dimensional formulation. Magazine of Civil Engineering. 2011. 22(4). Pp. 40-47. (rus). DOI: 10.5862/MCE.22.7. 10.5862/MCE.22.7 three-dimensional problems theory of bending elasticity theory of plates displacement stress strain strength differential equation https://engstroy.spbstu.ru/article/2011.22.7/ usarov_izgib.pdf