AlfaBuild

RAR RUS 2101-2101 0000-0001-8138-332X All-Russian Research Institute for Civil Defence of the EMERCOM of Russia (the Federal Science and High Technology Center) Nigmetov Gennady Maksimovich tagirmaks@mail.ru vniigochs@vniigochs.ru

Russia, Moscow, st. Davydkovskaya, 7

57195595288 0000-0002-1737-6624 All-Russian Research Institute for Civil Defence of the EMERCOM of Russia (the Federal Science and High Technology Center) Savinov Andrew Maksimovich savandr198@mail.ru vniigochs@vniigochs.ru

Russia, Moscow, st. Davydkovskaya, 7

0000-0003-0543-8768 All-Russian Research Institute for Civil Defence of the EMERCOM of Russia (the Federal Science and High Technology Center) Nigmetov Temir Gennadevich t.nigmetov@ya.ru vniigochs@vniigochs.ru

Russia, Moscow, st. Davydkovskaya, 7

https://orcid.org/0000-0001-9369-8214 Saint-Petersburg state university of architecture and civil engineering Savin Sergei Nikolaevich savinsn@gmail.com intern.depart@spbgasu.ru

Saint-Petersburg, Russia

https://orcid.org/0000-0001-8522-6110 Ministry of Emergency Situations of the Republic of Armenia Simonyan Ashot ashot.simonyan1988@gmail.com mes@mes.am

Armenia, Yerevan Tsitsernakaberdi Highway, 8/1 Building

Dynamic-geophysical tests of the technical condition and earthquake-resistance of historical buildings The object of research is historical structures, assessment of their technical condition and seismic resistance. Historical buildings are at great risk of destruction not only due to aging and wear of structures, but also due to the impact of dynamic and static loads of natural and man-made impacts, the intensity of wear can significantly increase and the building can become unsafe. The most dangerous are dynamic loads associated with vibration impact on structures from the passage of heavy vehicles and impacts from earthquakes. To assess the technical condition of historical buildings required a reliable non-destructive method of natural oscillations for assessing the degree of their wear and seismic resistance. That is, the method of researching historical structures should be non-destructive. It is proposed to use new non-destructive dynamic-geophysical method based on background microseismic vibrations of soil construction system for the integral assessment the technical condition and earthquake-resistance of historical buildings. The result of non-destructive studies by the method of dynamic-geophysical testing of historical structures will be an assessment of their technical condition and seismic resistance. 10.57728/ALF.21.1 69 Buildings Vibration analysis Nondestructive testing Non-linear dynamic analysis Natural frequencies https://alfabuild.spbstu.ru/article/2022.21.1/

REV RUS 2102-2102 F-1412-2016 57192116976 0000-0001-7511-2355 National Research Moscow State University of Civil Engineering Shushunova Natalia Sergeevna

129337, 26, Yaroslavskoye Shosse

T-2699-2017 57202819498 0000-0001-5702-217X Federal State Budgetary Educational Institution of Higher Education "Russian University of Chemical Technology named after D.I. Mendeleev" Shushunova Tatyana Nikolaevna serg-1167@yandex.ru

125047, Moscow, Miusskaya square, 9

Role of green roofs in increasing the economic efficiency of the agricultural sector of the Russian economy. A review The object of research is green roofs in the agricultural sector of the Russian economy. The purpose of this work is to analyze the green roofs and their function to mitigate the effects of climate change: floods caused by heavy rainfall or waves of unbearable heat, which are increasingly affecting residents of megacities. Method. The modern approach is used to analyze the green roofs and urban farms with current market indicators in Russian Federation and in the global market. The theoretical and methodological tools in this article are the principle of economic theory, which allow to substantiate ways to increase the economic efficiency of the agricultural sector of the economy of our country. Among the significant eco-directions, which implemented by Russian developers, the most popular are the economical work with water and the creation of additional recreational spaces on the rooftops. Results. This research examines the ecological sustainable technologies in the agricultural sector of the Russian economy and green marketing analysis of alternative organic farming. 10.57728/ALF.21.2 69 Green building Green roof technology Economic efficiency Sustainable development Organic farming Energy efficiency https://alfabuild.spbstu.ru/article/2022.21.2/

RAR RUS 2103-2103 0000-0003-0746-2091 National Polytechnic University of Armenia Chibukhchyan Hovhannes hovhannesch@gmail.com

Armenia, Yerevan, Teryan 105, 0009

Increasing the strength of thin-walled stainless steel parts The object of research is the parts and assemblies of modern construction machines and mechanisms is important for reducing operating costs, increasing productivity, reducing downtime for repairs, improving their quality and competitiveness, which naturally imposes strict requirements on their mechanical properties, reliability, strength, and durability. The use of simple manufacturing technologies is also of great importance. One of the effective ways to increase the mechanical properties of thin-walled parts of surface-plastic deformation (PPD), among which a special place is occupied by methods of PPD using ultrasonic vibrations (UV). The purpose of the work is to improve the physical and mechanical characteristics of their thin-walled parts using the technology of bilateral ultrasonic smoothing of their working surfaces. Method. A new method of ultrasonic bilateral hardening of thin-walled sheet materials has been developed, which makes it possible to obtain blanks in the form of sheet materials hardened on both sides, from which thin-walled machine parts are obtained by pressure treatment methods. Results. Experimental studies have established simplified quadratic mathematical models of the dependences of the microhardness of the hardened layers and the depth of their penetration on the technological parameters of the ultrasonic smoothing process. It is shown that bilateral ultrasonic processing of thin-walled plates increases their axial stiffness by up to 49.6% with a simultaneous increase in their plasticity, which makes it possible to significantly improve the conditions for stamping complex machine parts from such plates. It is established that using the technology of bilateral ultrasonic hardening of sheet blanks for the manufacture of them by methods of processing materials by pressure allows up to 20...30% to improve the weight characteristics of manufactured thin-walled machine parts. 10.57728/ALF.21.3 69 Strength Ultrasonic treatment Thin-walled part Mathematical model Microhardness Mechanical properties https://alfabuild.spbstu.ru/article/2022.21.3/

RAR RUS 2104-2104 0000-0003-0406-7360 Volga State University of Technology Salihov Muhammet Gabdulhaevich SalihovMG@volgatech.net

Lenin Sq., 3, Yoshkar-Ola, Russia, 424000

0000-0002-0787-4259 Volga State University of Technology Veyukov Evgenij Valerianovich VeukovEV@volgatech.net

Lenin Sq., 3, Yoshkar-Ola, Russia, 424000

0000-0002-0404-8445 Volga State University of Technology Lomakina Ekaterina Aleksandrovna LomakinaEA@volgatech.net

Lenin Sq., 3, Yoshkar-Ola, Russia, 424000

0000-0002-8721-0144 Volga State University of Technology Ponedelko Lyudmila Ivanovna PonedelkoLI@volgatech.net

Lenin Sq., 3, Yoshkar-Ola, Russia, 424000

Bitumen Aging on the Surface of Igneousand Carbonate Rocks of Various Grain Size The object of research is asphalt concrete mixtures.Experimental study of the aging process of bitumen films in the composition of bitumen-mineral mixtures consisting of dispersed mineral grains of various rocks (granites and limestones) of fractional composition fr. 5...20 mm, 0.315...5.0; 0.05...5.00 and 0.05...0.71 mm and BND 90/130 and BND 70/100. Method. The experiments were performed under the method covered by the Russian Federation Patent No. 2654954, proposed at the Volga State University of Technology (Department of Building Technologies and Highways). The assessment of the aging rate of bitumen-mineral mixtures was performed by: 1) establishing the values of the ultimate compressive strength at +50 °С for standard cylindrical samples (height and diameter 50x50 and 71.4x71.4 mm). The samples are formed from mixtures and stoved at +150 °С for 0...7 hours; 2) Calculating the values of the aging factor, the aging rate and analyzing the change in the values depending on the preheating time of the mixture at a high temperature. Results. Statistical processing of the data obtained during the experiments was carried out by the one-factor design method in the CurveExpert software environment. After that, mathematical models with a high correlation degree were obtained (S=0.000432…0.13578; r = 0.90498….0.99997). These mathematical models are mainly represented by Sinusoidal Fit; Harris and Exponential models and can be used to plan the operational behavior of materials in the composition of road structural layers. 10.57728/ALF.21.4 69 Limestone Asphalt Asphalt mixtures Durability Elevated temperature Binders https://alfabuild.spbstu.ru/article/2022.21.4/