33407 2304-6295 2 95 2021 1-67

RAR RUS 9501-9501 H-9967-2013 16412815600 0000-0002-8588-3871 National Research University Moscow Power Engineering Institute Kirsanov Mikhail Nikolaevich mpei2004@yandex.ru

Moscow, Russian Federation

Deformations of the Rod Pyramid: An Analytical Solution The object of the study is a spatial statically determinate pyramid-type covering truss. The truss has vertical support posts along the perimeter of the base. The corner nodes are fixed on spherical support, cylindrical, and rack. The truss has axial symmetry. The aim is to determine the analytical dependence of the deflection of the structure on the number of panels in its base. Two types of loads are considered: distributed along the edges and vertical loads concentrated at the vertex. Method. The Maxwell - Mohr formula is used to determine the deflection. The forces in the rods, together with the reactions of the supports, are found in their general system of the equilibrium equation of all nodes. The generalization of partial solutions to an arbitrary number of panels is obtained by induction using operators of the Maple computer mathematics system. Results. The dependence of the deflection on the number of panels is obtained in the form of a compact formula containing quadratic or linear polynomials in the number of panels. The inclined and horizontal asymptotes of the solutions are found. The existence of deflection minima depending on the number of panels is shown. 10.4123/CUBS.95.1 69 Truss Pyramid Analytical solution Deflection Maple Induction https://unistroy.spbstu.ru/article/2021.95.1/

RAR RUS 9502-9502 54893821600 0000-0001-8149-445X South Ural State University Degtyareva Natalia degtyareva_nv@mail.ru

Chelyabinsk, Russian Federation

Finite Element Analysis of Cold-Formed Steel Channels with Solid and Slotted Webs Subjected to Web Crippling under Interior Two Flange Load Case The numerical study was undertaken to investigate the web crippling behaviour and capacities of cold-formed steel channels with staggered slotted perforations with their flanges unfastened to the supports under the interior two flange load case. Finite element models were developed in ANSYS and validated using experimental results. The effect of initial geometric imperfections on the web crippling capacity was investigated. The closest web crippling capacities for the solid and slotted models to the web crippling capacities obtained from the tests were obtained for the scaling factor of the initial geometric imperfection of  –d1/150. The results show that the developed finite element models predicted the web crippling capacities and failure mode shapes of the solid and slotted channels. Proposed design equations for perforated channels showed a good agreement with FE results. However, the formulas are based on the test results of a limited range of sections and perforation patterns. The FE models can be used to investigate the effects of various geometrical and mechanical parameters of the slotted channels in further parametric studies. 10.4123/CUBS.95.2 69 Cold-formed steel design Web crippling Cold-formed steel section Channel sections Perforated webs Slotted channels Slotted webs Finite element method Numerical study https://unistroy.spbstu.ru/article/2021.95.2/

RAR RUS 9503-9503 57103491500 0000-0001-6833-7417 Immanuel Kant Baltic Federal University Velikanov Nikolay Leonidovich NVelikanov@kantiana.ru

Kaliningrad, Russian Federation

T-2380-2017 16441812200 0000-0003-0560-5933 Kaliningrad State Technical University Naumov Vladimir Arkad'evich van-old@mail.ru

Kaliningrad, Russian Federation

Algorithm for Selecting a Concrete Pump in the Construction of High-Rise Buildings The use of concrete pumps allows you to mechanize and automate the main processes of laying concrete in construction, use additive technologies. To choose the right pump, you need to know the hydraulic characteristics of the network, the rheological properties of the mixture. This article is devoted to developing an algorithm for calculating the pump characteristics for specific construction conditions. Method. The algorithm is based on the empirical dependencies previously proposed by the authors for pump characteristics, mixture rheology, and hydraulic network characteristics. Results. For stationary piston concrete pumps, an example of calculations using the proposed algorithm is given. It is shown that when choosing a piston pump, information is needed about the value of the filling factor, the dependence of the total efficiency of the pump (or the power consumed) on the pressure drop. 10.4123/CUBS.95.3 69 Stationary piston concrete pump Mixture transportation Rheological model Pressure loss https://unistroy.spbstu.ru/article/2021.95.3/

RAR RUS 9504-9504 B-4397-2014 56826013600 0000-0003-1071-427X Peter the Great St. Petersburg Polytechnic University Gravit Marina Viktorovna marina.gravit@mail.ru

St. Petersburg, Russian Federation

0000-0003-4394-0791 Institute of Computational Modelling of the Siberian Branch of the RAS Kirik Ekaterina Sergeevna kirik@icm.krasn.ru

Krasnoyarsk, Russian Federation

0000-0003-4653-0341 Peter the Great St. Petersburg Polytechnic University Savchenko Egor Timofeyevich savgor97@gmail.com

St. Petersburg, Russian Federation

Effect of Design on the Evacuation Time for the Colosseum of Rome The article analyzes the space-planning characteristics of the most famous amphitheater of ancient times of the Roman Colosseum (Rome, Italy) in the field of evacuation in case of fire. 3D computer models of the arena were built, and evacuation was simulated using the Sigma FS software (Russia). A comparative analysis of the space-planning solutions of the arena with the modern concept of organizing the provision of the unhindered and timely evacuation of people is carried out. It has been established that a number of features have been designed in the Colosseum, which makes it possible to carry out evacuation more successfully than in modern sports facilities: the configuration of the stairs, providing a high speed of movement; the average duration of clusters is three times less, and there are fewer turns on the stairs. It is shown that the layout of the Colosseum makes it possible not to carry out a phased evacuation and does not require fencing the escape routes from the main space. In general, the Roman Colosseum did not require evacuation control (routing) to equalize a load of traffic on the stairs and reduce the time of congestion in front of the stairs. 10.4123/CUBS.95.4 69 Arena Design Evacuation time Fire safety Organizing evacuation Computer simulation https://unistroy.spbstu.ru/article/2021.95.4/ 9504.pdf

RAR RUS 9505-9505 B-4397-2014 56826013600 0000-0003-1071-427X Peter the Great St. Petersburg Polytechnic University Gravit Marina Viktorovna marina.gravit@mail.ru

St. Petersburg, Russian Federation

0000-0002-8130-9434 Peter the Great St. Petersburg Polytechnic University Kuzenkov Kirill Alexandrovich

St. Petersburg, Russian Federation

57197818952 0000-0002-9822-3637 Technische Universitat Graz Dmitriev Ivan Igorevich i.i.dmitriev@yandex.ru

Graz, Austria

0000-0003-4378-3028 Peter the Great St. Petersburg Polytechnic University Nafikova Marina Vitalievna

St. Petersburg, Russian Federation

Vertical Transport Systems for High-Rise Buildings The article discusses various vertical layouts of elevator transport for high-rise buildings. The following configurations of elevator transport are considered: with two, one and without transfer levels (Sky lobby), the possibility of using not only one-story, but also two-story elevators, double and single technical floors is substantiated. Vertical planning implemented with two transfer floors is on average 11% more efficient than with one transfer floor, and 32% more efficient than high-rise planning without transfer floors. A configuration with no transfer floors requires an average of 22% fewer lifts. The most compact solution for the organization of elevators is S2-L2, the smallest number of elevators in total is So-L2.   10.4123/CUBS.95.5 69 Vertical design Elevator Lift High-rise building Vertical transport https://unistroy.spbstu.ru/article/2021.95.5/ 9505.pdf