75504 2712-8172 4 14 2010 1-60

RAR RUS 5-12 Wuhan University of Technology Mariko Ousmane ousmanemarik@yahoo.fr Experimental analysis and flexural behavior of reinforced-concrete beams reinforced with Glass-fiber-reinforced-polymers This article was removed because of the case of plagiarism. 10.18720/MCE.14.3 reinforced-concrete beams glass-fiber-reinforced-polymers https://engstroy.spbstu.ru/article/2010.14.1/ mariko_glass-fiber.pdf

RAR RUS 13-16 Cherepovets State University Paranicheva Natalya natashasunny@yandex.ru Cherepovets State University Chernova K. Fixed textile shutters One of the main socio-economic problems in Russia is the high cost and the poor condition of housing. Such goals as cost reduction, reducing installation time and increasing the service life of structures are accomplishing by creating new technologies of erecting buildings and developing ways ofquickconstruction, using different types of fixed formwork. One of themis textstone. Textstone is an artificial construction stone, containing on the outer surface the reinforcing fine-mesh shell with multifunctional properties, formed by the interwoven threads of a vigorous fixed formwork textile material (basalt, linen, silica and other glass yarns) adhered by binding material. The innovative construction technology of production and installation of a new generation of textstone buildings has been registered as a brand TextStone. The fundamental difference between texstone and reinforced concrete and all known building materials is that the whole outer surface of solidified light binders is protected by strong, vigorous and fixed formwork made from inexpensive textile materials. Manufacturing textile shells allows using it as an internal finishing material, reducing or eliminating the cost of finishing work. The use of fixed textile construction shutters during the construction of buildings has obvious technical, economic, operational, sanitary and environmental benefits: short construction time (from 3 to 10 days), compact packaging and light weight of fabric shells, high fire resistance, frost resistance, ease of engineering services installation in the hollow communicating shells; minimal amount of finishing, roofing, heat and noise insulation works. Texstone is a durable solid monolithic construction that provides high viability and earthquakes, hurricanes wind, solar sultriness and frost resistance. Material complies with all sanitary and environmental requirements. Due to such physical, mechanical, operational, sanitary and ecological characteristics of the structure, long life and reduced assembly time textstone has great prospects for development and application in the future. 10.18720/MCE.14.2 textstone fixed shutters textile shutters quick construction reducing cost of construction https://engstroy.spbstu.ru/article/2010.14.2/ paranicheva_tekstopalubka.pdf

RAR RUS 17-20 South-Urals State University Nikonorov Stanislav nikonorov-sv@mail.ru South-Urals State University Tarasova O. Early loading of floor monolithic slabs with removable forms This article considers the technology of early loading monolithic slabs using beam and rack timbering. The main principle is the next: after the concrete is cured to the required strength, the forms are removed and the support shores are installed for load transfer to the underlying floor slab. Such technique allows to form stripping at 60% concrete strength with shoring the upper floor slab on the two underlying ones. The suggested technique results in reduced concrete cure time. The calculation of frame under erection to justify the technique in this question showed that floor slabs endure the load during erection with the concrete strength being 60% of the design value. The same principle was applied during erection of a cast-in-place building. The cast-in-place concrete was cured to 60% strength and supported by shores, which were installed on the two underlying decks. In this case floor slab camber did not exceed the standard camber allowed. 10.18720/MCE.14.1 concrete monolithic slabs concrete curing time concrete strength increasing early loading https://engstroy.spbstu.ru/article/2010.14.3/ nikonorov_monolit.pdf

RAR RUS 21-30 Nonprofit partnership “AVOK – Severo-Zapad” Sotnikov Anatoliy asotnikov2005@yandex.ru Mathematical and stereographic analysis of intensity of solar radiation and openings shading for the building SLE calculation Modern administrative and public buildings have increased and sometimes excessive glazing area. Stained glass often takes the height from floor to ceiling, and in the corner room window area can construct 30 - 40% of the total area of the external and internal enclosures. Without discussing the visual appeal of these fronts, let us pay attention to the thermal protection from heat loss in winter and heat income in the summer. It is known that the heat transfer coefficient of the window is 4-5 times greater than the wall, and heat radiation has intensity up to 700-800 W/m2. For such rooms and buildings should be specified the design temperature for heating in winter. Traditionally in Russia, "5-day" temperature can lead to deviations of the room temperature, which will exceed permissible levels. The periodicity of radiation exposure needs to apply a harmonic analysis in its description. More generally, taking into account the shading from this or neighboring buildings we need harmonic analysis in more general view. Finally, the time of beginning and the end of irradiation can only be determined on the basis of stereographic trajectories of the Sun. All this taken together will allow finding a more accurate way of calculation of radiative heat influxes into the room and determining the time of its insolation. 10.18720/MCE.14.8 intensity of solar radiation shading radiative heat influxes buildings with increased glazing area mathematical and stereographic analysis https://engstroy.spbstu.ru/article/2010.14.4/ sotnikov_SKV.pdf

RAR RUS 31-32 Kazakh Head Architectural Constructional Academy Ospanov S. Kazakh Head Architectural Constructional Academy Sahariyeva Asiya asiya_aktobe@mail.ru Saint-Venant principle in geotechnics The problem of determining the stresses in the ground mass are important for calculating the strength, stability of soils, and also their deformation by external forces and its own weight. There are three basic mathematical methods of solving the elasticity theory problem: the direct method, inverse method, semi-inverse method of Saint-Venant. The last one is confirmed by experimental data not only for elastic bodies, but also for more complicated variants, which are the grounds. The validity of this principle is demonstrated through the analysis of structures on elastic foundation. Direct measurements of the compressive stresses under the action of different loads on the soil confirm the results of theoretical solutions. The article shows that the Saint-Venant principle allows to reproduce the desired stress state through the simplified loadings on the model surface. 10.18720/MCE.14.6 Saint-Venant principle soil stresses geotechnics strength stability deformations of soils https://engstroy.spbstu.ru/article/2010.14.5/ sakharieva_sen-venan.pdf

RAR RUS 33-77 Peter the Great St. Petersburg Polytechnic University Bogolepov Igor igor.bogolepov@mail.ru

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

Peter the Great Saint Petersburg Polytechnic University Chen S. chen_xiating@mail.ru

Polytechnicheskay, 29

Magnetic suspension in soundproofing cabins for confidential talks This article discusses the idea of providing sound insulation of the room by using a magnetic suspension. It is based on the invention of the Abrakitov V. E.: sound bridge problem is solved by the avoidance of mechanical contact between the panel and the main structure by a magnetic suspension of sound-insulating vacuum panel. The problem is considered on the example of the cabin for private talks. The implementation of sound insulation from airborne sound is technically uncomplicated task, but there are some problems with the structural component of the sound - the sound energy transfer from box floor to office floor and further through the building structures, sometimes at great distance. Modern methods of eavesdropping can use successfully this way. This paper suggests using a magnetic suspension in soundproof rectangular cabins for confidential talks, which excludes leakage of speech information by more effective isolation of the structural sound. If it is necessary to stop the voice information leakage fundamentally by both air sound and structural sound ways, the authors propose to make a cabin from two steel spherical shells, exhausting all air between the walls and supporting the inner shell by the magnetic suspension in suspended condition. In addition, a spherical cabin is the only effective way of isolation from infrasound. The proposed soundproof rectangular and spherical cabins for confidential talks should be designed, manufactured and tested by experts in the field of acoustic, magnetic suspension, autonomous air regeneration and providing a vacuum. Only in this case the necessary acoustic, technological and operational characteristics of a new hi-tech product will be provided. 10.18720/MCE.14.7 sound insulation magnetic suspension sound propagation structural sound air sound https://engstroy.spbstu.ru/article/2010.14.6/ bogolepov_podveska.pdf

RAR RUS 38-48 "Kitezh" LLC Architecture and Construction Company Zhgutov Vladimir abc.kitezh@gmail.com

St. Petersburg, Russia

Mathematical and computer simulation of nonlinear free vibrations of elastic shallow shells with step-variable thickness Shells as building elements are widely used in various fields of engineering. For example, in industrial and civil construction they are used as roofs and ceilings for structures with large spans (circuses, markets, railway stations, warehouses and hangars), various ramps, awnings and canopies. Often, thin-walled part of the shell (here and after - the thin envelope) is reinforced by ribs in one or two directions, or has variable holes, bulges, cuts. In such thin envelopes deflections that are commensurate with the thickness of the shell itself, can be formed even under load, which is far from the critical values. The study of these shells containing ribs, linings and openings (here and after - envelopes with step-variable thickness) is of considerable interest in the design of the structures. In this paper, the nonlinear equations of motion of envelopes with step-variable thickness (in the case of Kirchhoff-Love model) are found. In these equations the geometric nonlinearity, discrete arrangement of ribs and cuts, shear and torsional rigidity of the ribs are taken into account. The proposed equations allow us to investigate the shell under the action of both dynamic and shock loads. In addition, technique for determining the amplitude-frequency characteristics of nonlinear free vibrations of a shell, considered as a system with n degrees of freedom is developed and realized in the form of computer program. 10.18720/MCE.14.5 envelopes with step-variable thickness thin envelope vibrations deflections amplitude-frequency characteristic equations of motion https://engstroy.spbstu.ru/article/2010.14.7/ zhgoutov_obolochki.pdf

RAR RUS 49-58 Peter the Great St. Petersburg Polytechnic University Sokolov Vladimir sva0808@rambler.ru

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

A probabilistic method for estimating the technical state of reinforced concrete monolithic slabs of old urban area buildings The paper considers the reinforced concrete monolithic floors, realized like beam-type construction. The slab is represented as a complex construction system of some intermediate level, which is a constructive element of the next higher level - the old industrial buildings of urban area in St. Petersburg. Overlay consists of the main beams (Gk), secondary beams (Wk), slabby sections (Fk) and columns (Lk), which are considered as subsystem elements. The methodology, based on technical diagnostics theoretical apparatus using probabilistic methods of recognition of complex technical systems states, is proposed for the analysis of elements condition and for determination the categories of the technical state. Diagnosis is performed by statistical methods using the generalized Bayesian formula. The analysis of the obtained results is executed using the apparatus of information theory, in particular using the concepts of information entropy, after calculating the posterior probabilities of subsystem elements states and the constructive system "overlapping" state by the indicated dependence. The category of the technical condition and the probability of this condition are appropriated to the constructive system "overlap" by the survey and probabilistic analysis results. Then the degree of definiteness of the system V (U) is calculated. The value of V (U) is an input of the "overlap" state in the state of the next, higher level system - building as a whole. 10.18720/MCE.14.4 concrete monolithic floor technical condition the category of technical condition technical diagnostics probabilistic method generalized Bayesian formula posterior probabilities of elements condition information theory information entropy https://engstroy.spbstu.ru/article/2010.14.8/ sokolov_ocenka.pdf

RAR RUS 59-60 Peter the Great Saint Petersburg Polytechnic University Abdullayev Gasym

Polytechnicheskay, 29

The main directions of building processes reliability improving There are different methods to increase the reliability of planning and management decisions in the large structures construction. The article considers the main issues concerning planning or management decisions, including development of methods for assessing the probability of adopted plan and management decisions accomplishment, assessing the level of reliability with combined use of several methods, evaluation of effectiveness of decisions on organizational technological reliability in the construction of large and complex structures. Based on these issues, the following approaches to improve reliability are proposed: development methods of efficient work organization, creation of time and resources reserves, duplication of the most important inter-related works (work chains). The article also discusses what additional costs are required to improve the organizational and technical reliability of the design decisions development and implementation and what positive economic results could be achieved. 10.18720/MCE.14.9 lanning and management decisions organizational and technical reliability large and complex building structures https://engstroy.spbstu.ru/article/2010.14.9/ abdullaev_nadezhnost'.pdf