33407 2304-6295 9 84 2019 1-37

RAR RUS 7-21 University of Tyumen Israfilova Alina University of Tyumen Kutrunov Vladimir Technische Universität Dresden Kaliske Michael Garcia Sarate Maria Alejandro Isogeometric analysis as an alternative to standard Finite element method In the article, the modification of the Finite Element Method, the so-called Isogeometric Analysis, which employs rational B-splines (NURBS) as basis-functions is considered. The new approach is aimed to prevent approximation of the geometry and provide higher continuity on elements’ borders. A brief review of rational B- splines is made, their basic properties are described, a review of existing today software products in which the described method is implemented to some extent is executed. In the contribution, a numerical example of analysis for a simple solid body in FEAP (Finite Element Analysis Program) is given for comparing results obtained by standard and modified methods. In the Isogeometric approach, the geometry of the analysed body stays exact no matter how coarse is the computational mesh. This leads to the more robust solution of the contact problems and of the composites analysis. Non-negative basis functions increase the quality of the created continuous variable fields. Moreover, the geometry for analysis can be obtained directly from CAD graphical editors, which becomes an important step towards the introduction of BIM technology in engineering design. The advantages of this method illustrate that it can be preferred for structural analysis of solids especially in cases when complex curved geometry has to be considered. 10.18720/CUBS.76.1 69 Isogeometric analysis rational B-splines Finite element method NURBS FEAP https://unistroy.spbstu.ru/article/2019.84.1/ 84__1.pdf

RAR RUS 22-33 0000-0001-9542-2430 StroyInvestCapital LLC Nurmukhametov Renat Rustamovich

St. Petersburg, Russian Federation

Reduction of water saturated clayey soils’ deflections by reinforcement Current research provides results of experimental tests of soft water saturated clayey soils reinforced with vertical elements. Tests were performed by using compression-filtration equipment (odometers) at the laboratory of Soil, foundation and engineering geology of Kazan State University of Architecture and Building Construction. Main goal of current research is increase of experimental base that would confirm theoretical equations also under development by the Author. Article describes assumed reasons and justifications of processes going within models that are presented at the results of current research. Up to date society of geologists, researchers of foundations and soils under buildings and structures actively investigates potential methods of deformability parameters of soft water saturated clays and methods on calculation of similar strengthening. One of the most beneficial directions is reinforcement of soils mass that already has weak parameters. 10.18720/CUBS.84.2 69 strengthening of water saturated clayey soils; water saturated clayey soil; soil reinforcement; soft clay; pore pressure; buildings’ foundations; consolidation; rheological parameter; time series deformation; deformation model; https://unistroy.spbstu.ru/article/2019.84.2/ 84_2.pdf

UNK RUS 34-50 G-2929-2018 56227381900 0000-0003-2673-4566 Peter the Great St. Petersburg Polytechnic University Sergeeva (Nemova) Darya Viktorovna darya0690@mail.ru

St. Petersburg, Russian Federation

Gareeva Aliya Osetrova Ekaterina Comparative assessment of building envelopes throughout the building life cycle The relevance of various ways to improve the energy efficiency of buildings is increasing in the construction industry. One of the most important steps to solve this problem is the design of thermal insulation walling structures with the most rational use of optimized materials from the point of view of both thermal and environmental characteristics. The authors of the article considered walling structures characterized by high technical parameters and environmental requirements. A comparative analysis of the enclosing structures of the walls is given, on the basis of which the most efficient wall construction is derived. For the analysis, six main options for the construction of buildings were considered: brick, foam block, laminated veneer lumber, wooden frame, light steel thin-walled structures, straw blocks and their thermal insulation properties and all the necessary characteristics were shown 10.18720/CUBS.84.3 69 Building envelope; Thermal insulation; Thermal energy; Energy efficiency of buildings; Building life cycle; Thermotechnical indicators; Energy saving; https://unistroy.spbstu.ru/article/2019.84.3/ 84_3.pdf

UNK RUS 51-62 G-2929-2018 56227381900 0000-0003-2673-4566 Peter the Great St. Petersburg Polytechnic University Sergeeva (Nemova) Darya Viktorovna darya0690@mail.ru

St. Petersburg, Russian Federation

ABE-1858-2021 57208300172 0000-0002-8396-4870 Peter the Great St. Petersburg Polytechnic University Kotliarskaia (Vasileva) Irina Leonidovna iravassilek@mail.ru

St. Petersburg, Russian Federation

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

Introduction of double-skin facades in the Russian Federation Glass facades are very popular today. They look restrained, expressive, there is nothing superfluous in their design, and they perfectly fit into the modern architecture of cities. The article discusses the concept of an innovative facade system - a double-skin facade. This design is common in Central and Eastern Europe. During operation, it has proven to be energy-efficient. The analytical study presents the classification of such facades by the method of ventilation and by the geometry of the inter-contour space, and identifies the main advantages. It was found that the best type is the box window type of the inter-contour space. Examples of using a double-skin facade system in Russia are considered in the second part of the work. Unfortunately, there are not many buildings of this type, this is due to the high cost, as well as the lack of sufficient and experimental base. This system has some comments on its use in cold climate, so it needs to be considered in more detail and improved. We need a comprehensive approach. It is important to carefully model different modifications of this design, as well as conduct full-scale tests, and expand the scientific base. 10.18720/CUBS.84.4 69 double-skin facade; translucent structure; enclosing structure; glass; facade system; air layer; air gap; energy efficiency; https://unistroy.spbstu.ru/article/2019.84.4/ 84_4.pdf