75504 2712-8172 5 65 2016 1-76

RAR RUS 3-16 Riga Technical University Gusevs Jevgenijs jevgenijs.gusevs@rtu.lv

Riga, Latvia

6508223358 Riga Technical University Serdjuks Dmitrijs Dmitrijs.Serdjuks@rtu.lv

1 Kalku Street, Riga LV-1658, Latvia

Peter the Great St. Petersburg Polytechnic University Artebjakina Gulnaz kino.i.nemcy@mail.ru

St. Petersburg, Russia

Peter the Great St. Petersburg Polytechnic University Afanasjeva Elizabeth lizik.1993@bk.ru

St. Petersburg, Russia

Riga Technical University Goremikins Vadims goremikins@gmail.com Behaviour of load-carrying members of velodromes’ long-span steel roof  Long-span roofs have been of an increased interest within the last sixty years. An archtype steel roof of velodrome with the maximum span, height, and length equal to 109.50, 23.07, and 126.00 m respectively, is considered as the object of the current investigation. The choice of the preferable structural solution and behaviour analysis of load-carrying members of the long-span arch-type steel roof of the velodrome is considered as the aim of the current study. The distribution of internal forces and stresses in the trihedral lattice steel arch with a triangular web such as displacements under the action of design loads were investigated for fixed, double-hinged, and three-hinged static schemes. It was stated that the preferable structural scheme is the fixed arch.  10.5862/MCE.65.1  arch wind load static scheme https://engstroy.spbstu.ru/article/2016.65.1/ 01.pdf

RAR RUS 17-26 0000-0002-4577-8794 Petersburg State Transport University Belash Tatiana belashta@mail.ru Petersburg State Transport University Rybakov Pavel mojiuctap@gmail.com

St. Petersburg, Russia

Buildings with suspended structures in seismic areas Using suspended structures in construction is one of the methods to improve the earthquake buildings resistance. This subject became very popular in the 60–70s of the 20th century. However, at that time there were no available methods to provide full studies devoted to the buildings of this type. Soon, however, the opportunity appeared due to the development of computer engineering. This caused further analysis and disclosure of the full potential of suspension systems. This article discusses five different structural layouts including using suspended structures. SOFiSTiK computer system was used to calculate them. The time of oscillations was the main criterion to evaluate the schemes. It is well-known that earthquake exposure on the building decreases if the time of oscillations increases. It was found that the time of oscillations of the buildings with suspended structures is greater by several times in comparison with the buildings with traditional structural system. Taken into consideration the given fact, we can suggest that the efficiency of suspension systems in seismic conditions is provided. 10.5862/MCE.65.2 seismic suspended structures oscillations period finite element method https://engstroy.spbstu.ru/article/2016.65.2/ 02.pdf

RAR RUS 27-41 Kiev National University of Construction and Architecture Priadko Iurii yura_pryadko@mail.ru

Kiev, Ukraine

Donbas National Academy of Civil Engineering and Architecture Mushchanov Volodymyr volodymyr.mushchanov@mail.ru Polytechnic Institute of Leiria Bartolo Helena helena.bartolo@ipleiria.pt

Leiria, Portugal

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

Polytechnicheskay, 29

Kiev National University of Construction and Architecture Rudnieva Iryna irene_p@mail.ru

Kiev, Ukraine

Improved numerical methods in reliability analysis of suspension roof joints Modern structures require more complex designs. There is an increased need for accurate approaches to assessing uncertainties in loads, geometry, material properties, and operational environments. However, information is scarce on the reliability of suspension roofs together with their joints. There is an urgent need for estimating stress-strain state and reliability of welded joints, so recommendations can be given based on the obtained data. In this paper, reliability of large-span suspension roofs was investigated and a fundamental approach is proposed for reliability determination of these joints at the design phase of suspension rod roofs. In this work, several joints were investigated: supporting joints between rigid threads and external/internal contours, intermediate joints of top /lower chords of supporting threads, as well as joints between vertical/horizontal links and supporting thread of a roof. To measure reliability of joints, logic and probabilistic methods were used conjointly with other methods based on mathematical statistics. The proposed approach can be applied to design of suspension roof systems and help to develop better designs for better safety, quality control and efficiency of these structures, providing economic and social benefits. 10.5862/MCE.65.3 roof suspension devices suspension system suspensions civil engineering constructions buildings roof joints reliability indices stress-strain analysis https://engstroy.spbstu.ru/article/2016.65.3/ 03.pdf

RAR RUS 42-66 Ufa State Petroleum Technological University Kozhaeva Ksenia st_kafedra@bk.ru Calculation of optimized methods of the river underwater pipeline backfill with the use of APMWinMachine 9.7 Nowadays, the standard techniques of backing the ballasted pipeline laid in a bottom trench are used: sequential deposition of soil by suction dredges along the slurry pipeline, soil discharge by self-dumping barges, soil unloading from a barge by the grapple, soil pumping from barges. The disadvantage of these methods is that backfill is done in consecutive stages, and soil, falling into water increases water specific weight to the pulp specific weight. As a result, the buoyancy force increases and, when backfill is accomplished, the pipeline is raised above the design reference mark. The aim of the research is to optimize the existing methods of pipelines backfill, which will prevent or reduce the rise of the pipeline from the design position during its backfill. The optimized methods of the submerged pipelines backfill, which use temporal metal and reinforced concrete loads or backfill by cofferdams, have been calculated with the help of APMWinMachine software. The results of the model calculation by the method of finite elements show the effectiveness of the proposed methods of the submerged pipeline backfill.   10.5862/MCE.65.4 river underwater pipeline the way of backfill backfill with cofferdams installation of temporal loads the calculation of optimized methods https://engstroy.spbstu.ru/article/2016.65.4/ 04.pdf

RAR RUS 67-76 St. Petersburg State University of Architecture and Civil Engineering Byzov Viktor mapana@inbox.ru

St. Petersburg, Russia

36884074300 0000-0002-2583-3012 Northern (Arctic) Federal University named after M.V. Lomonosov Melekhov Vladimir v.melekhov@narfu.ru

Arkhangelsk, Russia

Structural sawn timber: resource enhancement The strength properties of wood have a great variability within the same species and the same growing region. In this regard, defect parameters do not fully characterize the strength and deformability of structural timber. Deterioration of timber quality requires a more reasonable use of resources and accurate assessment of the strength properties of output timber. To evaluate the strength properties of timber planks and beams produced from small size wood assortment, we have adopted a special parameter called "relative aggregate knot volume at destruction section". This paper introduces the regression models demonstrating the correlation between strength properties of timber planks and aggregate knot volume at destruction section. We also provide recommendations for grading timber planks by strength classes and give a comparative analysis of timber output by grades under applicable national standards and regulations, thus demonstrating the possibility of attracting additional sawn timber resources for production of load-bearing engineering structures.  10.5862/MCE.65.5 wood strength and testing of materials timber structures quality control https://engstroy.spbstu.ru/article/2016.65.5/ 05.pdf