33407 2304-6295 3 54 2017 1-128

RAR RUS 7-17 Peter the Great St. Petersburg Polytechnic University Nikolaeva Inna inna4i4n@mail.ru

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

Peter the Great St. Petersburg Polytechnic University Ogorodov Leonid l.ogorodov@mail.ru

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

Peter the Great St. Petersburg Polytechnic University Yakovleva Elena helena47@mail.ru

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

Creep polytetrafluoroethylene modifications under various loading conditions Based on the experimental results, we construct an equation of mechanical states, taking into account instantly elastic, viscoelastic, and viscoplastic momentary-elastic strain components using the constancy of the volume of the material terms of the similarity of deviators stresses and strains, as well as the introduction of parameters which are functions of the form of the stress deviator. Equation satisfactorily describes the creep strain at stationary time-dependent static and cyclic loading. An experimental study of deformation and creep in polytetrafluoroethylene (PTFE) in a linear and plane stress was performed. In the process of the experiments true stress was supported, taking into account deformations. It was build the equations of mechanical state, taking into account instantly elastic, viscoelastic, instantaneous-plastic and visco-plastic components of the total deformation. The equation used to describe PTFE strain (F-4, F-4D, F-4D0) when stationary and non-stationary mode cyclic loading in flat tension condi-tions with condition constant volume of material and similarity of deviators of stresses and strains, as well as with the introduction of the parameters that are functions of the form of the stress deviator. Relevant and difference from the works of other authors are research results creep PTFE modifications at values true stress reaches the limit. The data on the limit creep PTFE modifications included. 10.18720/CUBS.54.1 69 creep polytetraftorethylene mechanical equation of states statics cyclical plane stress ultimate strains https://unistroy.spbstu.ru/article/2017.54.1/ 1_yakovleva_54.pdf

RAR RUS 18-34 Peter the Great St. Petersburg Polytechnic University Slepchenko Pavel 23Birdhouse@gmail.com

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

Sinyakov Leonid Influence of temperature and humidity conditions on building structures of basements The article is devoted to the actual problem of disruption of the normal temperature and humidity conditions in the basements of the old building stock in St. Petersburg. The article considers the main causes of disruption of the normal temperature and humidity conditions and its impact on the building construction of the residential units. The following defects and damages of structures in basements of old building stock are analysed: violation or lack of due system of ventilation, violation or lack of waterproofing the basements, formation of cracks in the base body, malfunctioning of drainage system, the increase of ground waters level, leakages of external and internal sanitary networks. We also consider the negative consequences of violation of normal temperature and humidity conditions of basements, namely chemical, physical and biological damages, which can lead to destruction of building constructions; as well as the change of physicomechanical characteristics of soil in the bases of foundations. It was concluded that the overwhelming number of injuries leading to disruption of temperature and humidity of basements occur during their operation. It was also pointed to the economic feasibility of the use of basements after restoring normal operating conditions in the central historical part of St. Petersburg. 10.18720/CUBS.54.2 69 temperature and humidity conditions a breach of the normal temperature and humidity conditions basements old building stock building constructions defects and damage of building constructions https://unistroy.spbstu.ru/article/2017.54.2/ 2_slepchenko_54.pdf

RAR RUS 35-46 Peter the Great St. Petersburg Polytechnic University Shlychkova Darita darita_egypt@mail.ru

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

O-6995-2019 6508103761 0000-0002-1196-8004 Peter the Great St. Petersburg Polytechnic University Vatin Nikolai Ivanovich vatin@mail.ru

St. Petersburg, Russian Federation

Structured steel plates This article contains information about a new structure surface of the steel sheet metals, provided by threedimensional hexagonal "honeycombs". Some mechanical properties were investigated, such as bearing capacity sandwich structured steel sheets, their possible application in building construction, advantages in comparison with the flat steel sheets. According to the research, the structured sheet metals can bear a several times higher force than the flat plate. It makes possible to use a such kind of structured plates in building, for example, as an alternative to thin-walled lightweight steel flat profiles. The article describes also the difficulties in production process of this cell-structured sheets. The calculation was conducted in FEM- program Abaqus: plates dimensions are 400x400 mm with different cell orientation. Four plate types were tested: the flat plates and structured sheets - with cell rotation 0 °, 45 °, 90 °. The deflection values of plates with the same external load were established 10.18720/CUBS.54.3 691.714 sandwich plates structured sheet metals simply supported beams hexagonal cells lightweight steel construction https://unistroy.spbstu.ru/article/2017.54.3/ 3_shlychkova_54.pdf

RAR RUS 47-62 Peter the Great St. Petersburg Polytechnic University Tarabukina Sardaana s.yurievna@mail.ru

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

Peter the Great St. Petersburg Polytechnic University Simankina Tatiana talesim@mail.ru

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

Peter the Great St. Petersburg Polytechnic University Kirilkina Anna civilengan@gmail.com

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

Thermal block efficiency as external walling The article gives an overview of various enclosing materials and products that are used in monolithic frame construction. Their distinctive features are considered. In addition, as a result of the analytical review, advantages and disadvantages were revealed, the produced nomenclature, production technology, technical characteristics of the thermal block - a three-layered enclosing wall structure, as well as the area of its application. It was noted that the thermal block with the development of design automation, it becomes possible to expand the zone of use of this material, manufacturing it for operation in different climatic regions of the world, taking into account specific features. 10.18720/CUBS.54.4 69 thermal block three-layer wall panel effective insulation material three-layer external walls external walls energy saving energy efficiency https://unistroy.spbstu.ru/article/2017.54.4/ 4_tarabukina_54.pdf

RAR RUS 63-70 57191531019 Brest State Technical University, Brest, Belarus Derkach Valery Nikolaevich v-derkatch@yandex.ru

Brest, Belarus

Branch of RUE Institute BelNIIS Demchuk Igor 7263712@mail.ru

Scientific-technical Centre,267/2, Moskovskaya str., Brest, 224017 Belarus

West Pomeranian University of Technology Szczecin Orlovich Roman orlowicz@mail.ru

al. Piastów 17, 70-310 Szczecin, Poland

The mechanism of damage non-bearing facing multilayered masonry walls The article describes typical damages of the facing layer from the slit ceramic brick in multilayered wall. It was found that the use of increased strength mortars for masonry of the facing layer leads to an increase of tensile and shear stresses in the brick at the temperature and humidity actions. It is shown that the mortar of the facing layer should be sufficiently strong in compression and still enough plastic. Low- strength mineral mortars have a low modulus of elasticity which increases the masonry crack growth resistance in temperature and humidity actions. Recommendations on increase crack growth resistance of facing layer have been presented. 10.18720/CUBS.54.5 69 facing layer mortar temperature and moisture action numerical simulation crack growth resistance https://unistroy.spbstu.ru/article/2017.54.5/ 5_derkach_54.pdf

RAR RUS 71-79 AAH-2547-2019 7801686579 0000-0001-7011-8213 Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russian Federation Barabanshchikov Iurii Germanovich ugb@mail.ru

St. Petersburg, Russian Federation

Peter the Great St. Petersburg Polytechnic University uznetsova Valeria kuznetsova_vy@mail.ru

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

Peter the Great St. Petersburg Polytechnic University Khakimova Viktoria viktory.andreevna@mail.ru

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

Protective properties of anticorrosive coatings of steel thin-walled profiles for walling Light steel thin-walled structures (LSTS), in particular with thermoprofiles, are widely used in construction of buildings and structures of various applications. These structures possess high heat-saving parameters, at the same time, durability of these structures may be limited by low corrosion resistance of steel. According to the latest amendments in the documentary standards, zinc coated thermoprofiles without additional paint coating may be used as load-bearing structures only in non-aggressive conditions. In this investigation we have established that the use of zinc coated steel with additional paint coating is much more effective measure of protection of steel articles against corrosion than separate zinc and paint coating. As a result of methods for corrosion testing, it was established, that the most effective measure of protection of steel articles against corrosion in aggressive conditions is the use of zinc coated steel with additional paint coating. These samples have been just slightly corroded during the test period (230 days). 10.18720/CUBS.54.6 69 thin-walled zinc coated steel profiles thermoprofile corrosion corrosion testing protective paint coating https://unistroy.spbstu.ru/article/2017.54.6/ 6_kuznetsova_54.pdf

RAR RUS 80-92 Peter the Great St. Petersburg Polytechnic University Potapov Ivan ivanpot@rambler.ru

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

Peter the Great St. Petersburg Polytechnic University Potapov Stepan stepan5700@mail.ru

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

Peter the Great St. Petersburg Polytechnic University Romanenko Michail rmv@hotmail.ru

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

Cost Efficiency of Dwelling Construction with Account of Cities Factors The process of urbanization is widely spread. New city territories are being built-up with residential buildings. These territories are located in the city center as well as on its outskirts. Therefore, developers should think about cost efficiency of the residential building construction which depends on the kind of building site. The main goal is to analyze the cost efficiency of the residential building construction in central districts of SaintPetersburg and on its outskirts. It is necessary to calculate a number of parameters characterizing the cost efficiency of the constructing such kinds of objects and take into account factors influencing on these parameters. These factors are location of construction objects in different parts of the city and, thus, different height restrictions, different average construction cost and different land acquisition cost]. After getting the results of the analysis [the conclusion will be made why the construction of residential building can be considered more appropriate in Krasnoselsky District (on the outskirts of the city) and less appropriate in Petrogradsky District (the center of the city) from the economic point of view. After all it will be possible to define economic feasibility of residential building construction in different parts of the city. This pattern will be also true for many other big cities. 10.18720/CUBS.54.7 69 thrust line cost efficiency residential building payback period profitability index net present value (npv) https://unistroy.spbstu.ru/article/2017.54.7/ 7_potapov_54.pdf

RAR RUS 93-104 Kazakh Leading Academy of Engineering and Construction Inc Bryantsev Alexandr Bryancev8989@mail.ru

28. street Ryskulbekov. Almaty. 050043. Republic of Kazakhstan

"AstanaStroyKonsalting" LLP Absimetov Vladimir Absimetov47@mail.ru

17/3, st. Brusilovskiy, Kazakhstan, Astana, 010000

AAH-3368-2019 56091980300 0000-0003-3850-424X Peter the Great St. Petersburg Polytechnic University Lalin Vladimir Vladimirovich vllalin@yandex.ru

St. Petersburg, Russian Federation

Effective application of I-beams with corrugated webs in the industrial building This article is devoted to analysis of cost-effectiveness and reasonable replacement of basic structures (columns, crane beams, roof beams, bridge beams) of hot-rolled I-beams with parallel faces of flanges of the industrial building using the overhead crane, lifting capacity of Q–5t on welded I-beams with corrugated webs. The main objective of this article is to justify the effective application of I-beams with corrugated webs in the industrial buildings. Frame calculation of the industrial building performed in the software system LIRA SAPR– 2015 has been considered. The results of calculation were presented, namely charts of maximum displacement from the load. The strength test of accepted sections of structural elements of the industrial building was conducted with the circuit jam at the basement cut level for the first and second limiting conditions. A comparative analysis of hot-rolled steel I-beams with parallel flange faces of welded I-beams with corrugated walls has been performed according to criteria: weight and costs. The cost-effectiveness of I-beams with corrugated webs was proved. Savings in terms of metal weight for the entire industrial building and reduced cost of structures are the main results of this article. 10.18720/CUBS.54.8 69 corrugated I-beam efficiency cost-effectiveness industrial building analysis https://unistroy.spbstu.ru/article/2017.54.8/ 8_bryantsev_54.pdf

RAR RUS 105-128 Peter the Great St. Petersburg Polytechnic University Bulatov Georgiy gybulatov@mail.ru

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

Peter the Great St. Petersburg Polytechnic University Voronina Natalia tata_101@mail.ru

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

Factors affecting the efficiency of full-strength tubular pile The article contains the criteria that give the opportunity to make a quantitative estimates of efficiency optimize a steel tubular pile by materials consumption. The objective of optimize is to reduce the material consumption for the manufacture of pile. On the basis of the studies presented in this article, the following conclusions can be reached. 1) Mathematical model is proposed to ensure the full-strength of pile; 2) Considers the influence of various factors onto the efficiency of the optimize, including: different outside diameters, geotechnical profile, burial depth of pile; 3) There are graphs and tables, which may also be used for approximate estimates of solutions to practical problems. 10.18720/CUBS.54.9 69 friction pile tubular pile pile capacity optimize of foundations full-strength pile efficiency of pile https://unistroy.spbstu.ru/article/2017.54.9/ 9_voronina_54.pdf