33407 2304-6295 9 60 2017 1-57

RAR RUS 7-21 Lomonosov Moscow State University Sudakova Maria m.s.sudakova@yandex.ru

GSP-1, Leninskie Gory, Moscow, 119991, Russia

Lomonosov Moscow State University Kalashnikov Alexey x_kalash@mail.ru

GSP-1, Leninskie Gory, Moscow, 119991, Russia

Lomonosov Moscow State University Terentieva Evgeniya genia_teren@mail.ru

GSP-1, Leninskie Gory, Moscow, 119991, Russia

GPR tomography as applied to delineation of voids This work presents the evaluation effectiveness of the GPR tomography for characterization of square voids in engineering structures. One of the columns of the iconic main building of the Moscow State University was selected as a target object with known configuration. Given that the heterogeneity of the column complicates the interpretation of GPR data acquired in reflection mode, transmission tomographic ray coverage was employed. Mathematical modelling and tomographic inversion to locate real objects were carried out. The radar tomography and the common-offset GPR geometry techniques are compared with respect to the acquired information about location, shape and dimensions of the void inside the column. The tomography results are characterized by high precision and are more reliable compared to the results of single-fold GPR survey. 10.18720/CUBS.60.1 69 non-destructive testing electromagnetic methods forward and inverse problem solving mathematical modeling ground penetrating radar tomography https://unistroy.spbstu.ru/article/2017.60.1/ 1_Terentyeva_60.pdf

RAR RUS 22-30 Peter the Great St. Petersburg Polytechnic University Shatornaya Alexandra alexandrashatornaya@gmail.com Peter the Great St. Petersburg Polytechnic University Chislova Maria animashki1@mail.ru

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

Peter the Great St. Petersburg Polytechnic University Drozdetskaya Marina drozdetskayama@yandex.ru

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

Peter the Great St. Petersburg Polytechnic University Ptuhina Irina irena_ptah@mail.ru

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

Efficiency of 3D printers in Civil Engineering This article studies the efficiency of new technology – concrete 3D printer. The creators of this equipment argue that it can save significant amount of funds, when used for building construction. This research looks into how 3D printer can save time needed for building frame construction and how it may affect the total construction cost. In this article you can see the results of calculation of labor and material costs for two types of houses: printed with a 3D printer and made of aircrete blocks. Moreover, the percentage of profit, based on potential time saved and the total cost of a single-story building were calculated. As a result of the research, it was concluded that 3D printers will be beneficial for construction companies engaged in large-scale low-rise construction. 10.18720/CUBS.60.2 69 3D print construction printer construction optimization aircrete https://unistroy.spbstu.ru/article/2017.60.2/ 2_Shatornaya_60.pdf

RAR RUS 31-41 Peter the Great St. Petersburg Polytechnic University Khrestianovskaia Mariia mariachernyh@gmail.com Radionova Julia conly@mail.ru Peter the Great St. Petersburg Polytechnic University Gabitova Gulnara gabitovaga@gmail.com

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

Radiant heating and cooling systems based on capillary micro tubes Radiant heating and cooling systems based on capillary micro tubes have been gaining much popularity due to large operational area, space saving, small difference between temperatures of flowing water and air inside the room and consequently improved energy efficiency. The objective of this review is to find out fields of applying capillary micro tubes, to discover advantages and limitations and analysis of future development. Based on research results it can be concluded that heating system based on capillary mats is an effective and promising solution for residential and public buildings. 10.18720/CUBS.60.3 69 Radiant heating and cooling systems capillary tubes mat capillary micro tubes hydronic heating systems low temperature heating energy efficiency https://unistroy.spbstu.ru/article/2017.60.3/ 3_Khrestyanovskaya_60.pdf

RAR RUS 44-57 S-4618-2017 57194431559 0000-0003-4992-2084 Peter the Great Saint Petersburg Polytechnic University Galyamichev Alexander Viktorovich galyamichev@yandex.ru

Saint-Peterburg, Russian Federation

Wind load and its action on facade structures This article provides reasoned recommendations for determining the wind load on various types of facade structures (ventilated facades and architectural glazing structures) based on the analysis of special technical conditions and foreign normative documents. Several questions was asked to the existing and current in Russian Federation normative documentation: Russian Set of Rules SP 20.13330.2016 "Loads and actions" and Russian State Standard GOST R 56926-2016 "Window and balcony structures of various functional purposes for residential buildings. General technical conditions" with comments and proposals for changes to the current national standard. The analysis of the most disadvantageous effect of the peak wind load on multi-span beam systems was made in this research, based on the conditions for the first and second limit states. The article provides recommendations for the value of the maximal permissible deformations of translucent structures and hinged ventilated facades. 10.18720/CUBS.60.4 69 facade structures wind load ventilated facades translucent structures loads and impacts https://unistroy.spbstu.ru/article/2017.60.4/ 4_Galyamichev_60.pdf