69439
2658-5553
AlfaBuild
12
5
12
2019
1-111
RAR
RUS
7-14
Peter the Great Saint Petersburg Polytechnic University
Galikhanova
Elina
linlvs.g@gmail.com
St. Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Bakaeva
Liubov
lubashka150994@mail.ru
St. Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Dernakova
Aleksandra
sasha231296@mail.ru
St. Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Yarunicheva
Yuliya
julija.jarunicheva@gmail.com
St. Petersburg, Russia
Polyurethane elastomer as an elastic material in seismic protection of buildings and structures
The article is devoted to the issue of reliable and economical seismic protection of buildings and structures. Of all the existing options, one most common type of point supports is chosen, which is a layered structure of alternately laid sheets of the elastic element and the metal. For elastic material, as having the best mechanical characteristics, a polyurethane elastomer is chosen. With the help of the servo-hydraulic system for static and dynamic tests Instron 8801, experiments were performed on axial compression to compare the mechanical characteristics of five different grades of polyurethanes: L167, V8000 + 7561 + BDO, 15s27, LF751D + L167 + Mokko, LF751 + L167 + Mokko at different temperature conditions. A comparative table is made of the modulus of elasticity change at a temperature close to room temperature and elevated temperature. The graphs of the hysteresis loop for each brand of polyurethanes are constructed.
10.34910/ALF.12.1
construction
seismic protection
elastomers
elastomeric bearings
energy intensity
shock absorbers
anti-seismic device
polyurethanes
https://alfabuild.spbstu.ru/article/2019.12.1/
12_1.pdf
REV
RUS
15-26
Peter the Great St. Petersburg Polytechnic University
Bakaeva
Liubov
lubashka150994@mail.ru
St. Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Egarmin
Konstantin
kon.egarmin@mail.ru
St. Petersburg, Russia
Peter the Great Saint Petersburg Polytechnic University
Galikhanova
Elina
linlvs.g@gmail.com
St. Petersburg, Russia
Effect of using rubber-metal seismic bearings on the dynamic and static characteristics of a multi-storey building.
Seismic danger is a significant factor in the choice of residence and has a great impact on the economic side of construction. The task of modern engineers is to search for optimal safe seismic construction decisions, even for seismically dangerous regions of the country. Dynamic characteristics obtained from 2 calculation models are investigated in the article: with seismic isolation and without seismic isolation. As an active seismic isolation rubber-metal supports are chosen as one of the most promising and modern methods. In the calculations, a seismic load is assigned for the area with seismicity of 9 points and for category II of soils. Calculations are made on a finite-element scheme, modeled in SCAD Office programs. The model is a section of a residential building located in Sochi. The characteristics of both computational models are compared: acceleration, displacement of the CE, torque, longitudinal forces. A comparative analysis is given and a conclusion is drawn about the effectiveness of using seismic insulating rubber mounts.
10.34910/ALF.12.2
construction
seismic protection
rubber-metal supports
energy intensity
shock absorbers
anti-seismic device
polyurethanes
https://alfabuild.spbstu.ru/article/2019.12.2/
12_2.pdf
RAR
RUS
27-33
Peter the Great St. Petersburg Polytechnic University
Gholami Fard
Rezvan
gholamifard.rezvan@gmail.com
St. Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Badenko
Vladimir
badenko@cef.spbstu.ru
St. Petersburg, Russia
Evaluation of aspect ratio (B/Y) in design of least-cost trapezoidal channel section
From a long time ago, there is a question to decide if a channel should be designed to have the highest hydraulic efficiency or the least cost.Channel cross-section design with an optimal cost under uniform-flow conditions includes minimizing the total cost per unit length of the channel. In this study, a large amount of construction cost of the channel was investigated and analyzed to calculate the cost function of the channel as a total cost associated with the land acquisition, channel material coverage and ground drilling depth for the channel. Case studies carried out in this technical note show that the difference between low-cost and efficient sections is closely related to the cost of the channel lining relative to the cost of land. When the base cover disappears to the unit cost of the land, the difference between the two parts is almost decreasing. This transaction was performed in the normal equation to provide a straightforward solution to the low-cost channel.
10.34910/ALF.12.3
open-channel flow
least-Cost
cross-section
aspect ratio
hydraulic design
https://alfabuild.spbstu.ru/article/2019.12.3/
12_3.pdf
RAR
RUS
34-43
Peter the Great St. Petersburg Polytechnic University
Volkov
Timofey
timonvolk@mail.ru
St. Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Pozdnyshev
Nikita
pozdnishev97@gmail.com
St. Petersburg, Russia
Vibration exposure during pile driving in urban areas
In this article the disadvantages of using piles in urban areas and determined the optimal solution to this problem. The influence of driven, vibration indentation, drilling and screw driving to nearby buildings. The article also calculated acceleration provided by the nearby buildings, in particular on their foundations by using different mechanisms piles dive into the ground, such as vibration indentation, diesel hammer, and hydraulic hammer and sickle single action. Moreover, to determine the necessary safety distances from the location of the construction sites of the existing buildings and structures. The schedule of dependence of vibration accelerations caused by different types of pile driving mechanisms, the distance to the building. The advantages of the technology of foundation - use screw piles in urban areas.
10.34910/ALF.12.4
screw pile
foundation
vibration acceleration
vibration indentation
diesel hammer
urban development
https://alfabuild.spbstu.ru/article/2019.12.4/
12_4.pdf
REV
RUS
44-52
Peter the Great St. Petersburg Polytechnic University
Nazarov
Mikhail
mikenazarow@yandex.ru
St. Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Kitsaev
Maxim
mr.kitsaev@mail.ru
St. Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Zimin
Sergej
zimin_sergei@mail.ru
St. Petersburg, Russia
Approaches to reinforced concrete beams shear performance
Practice shows that cracks are frequently formed beside reinforced concrete beam supports, and can be the cause of destruction on inclined sections. Cracks formation connected with principal tensile stresses. At the moment, acceptable in engineering practice methodology for inclined cracks analysis haven’t been found. That is why different simplified approaches were introduced. This research was aimed to look through Russian and European construction regulations and find out, which method could be considered as more usable and completed. Calculations showed that both methodologies significantly underestimate load-carrying ability, but Russian approach allows to design more economic shear reinforcement. The same result was declared by other authors.
10.34910/ALF.12.5
building construction
reinforced concrete structures
transverse force
diagonal crack
load-carrying ability
methodology for structural analysis
construction regulations
https://alfabuild.spbstu.ru/article/2019.12.5/
12_5.pdf
REV
RUS
53-59
Peter the Great St. Petersburg Polytechnic University
Nenakhova
Irina
irina-nenahova-v@mail.ru
St. Petersburg, Russia
Modeling and calculation of a two-stored power-and-efficient house for seismic control areas
In the northern regions of the Russian Federation (Tomsk, Novosibirsk and other regions), a project of an energy-efficient two-story building with a metal frame was developed and implemented. In many regions of the Kyrgyz Republic, such energy efficiency is particularly relevant. However, the introduction of the practice of building such buildings in mountainous terrain requires additional studies to assess the strength and deformation characteristics from the position of seismic safety. The problem of modeling and calculation of a two-storey energy-efficient residential building for seismically hazardous areas is considered. The model of the building under investigation designed and made in metal is presented, the stability of the structure is checked for various types of loads. The results of the study confirm the feasibility of the project for construction in seismically hazardous areas.
10.34910/ALF.12.6
model
seismic
destruction
stability
frame.
https://alfabuild.spbstu.ru/article/2019.12.6/
12_6.pdf
RAR
RUS
60-66
Belarusian-Russian University
Moskalkova
Yuliya
julia43@tut.by
Mogilev, Belarus
Polypropylene fiber-reinforced claydite concrete
The paper presents an analysis of the possibility of using polypropylene fibers for fiber-reinforced claydite concrete. An analytical review of empirical literature deals with the efforts of various researchers in production of the polymeric fiber-reinforced normal concrete and lightweight aggregate con-crete. Based on this review, it was concluded that the optimum content of polymer fiber by weight. Cases where polymer fiber reinforcement proves to be ineffective are considered. In addition, the variants of com-bined reinforcement by different types of fiber are considered: polymeric and steel fiber, polymer and glass fiber. The use of polymeric fiber and acrylic polymer is also considered. The results of the test of the first trial series of prototypes made of polypropylene fiber-reinforced claydite concrete are presented (the raw material used for making claydite concrete is found in the Republic of Belarus). From the analytical review, it is observed that the optimum dosage of polypropylene fiber is 0.5–1.5 % of the cement weight in claydite concrete. Prospects for further research are described in general terms.
10.34910/ALF.12.7
lightweight aggregate concrete
claydite
fiber reinforcement
polypropylene fibers
reinforcement ratio
https://alfabuild.spbstu.ru/article/2019.12.7/
12_7.pdf
RAR
RUS
67-84
Peter the Great St. Petersburg Polytechnic University
Ngo
Huu Hieu
ngohuuhieubkdn123@gmail.com
St. Petersburg, Russia
Influence of deformation on reinforced concrete beam elements with uneven heating
Currently, in the chemical industry and the energy sector, many destroyed buildings are exposed to high temperatures. In this article, the influence of deformation of reinforced concrete structural elements (ZhBEK) of the corresponding boundary conditions is analyzed with versatile heating up to +200 degrees Celsius. The finite element method (FEM) was used to simulate the process of deformation of reinforced concrete structural elements in ANSYS Mechanical (Workbench), as well as data on the deformation of reinforced concrete structural elements of structures. One of the most common such complexes today is the ANSYS program, using the finite element method, is a multi-purpose package of design and analysis, recognized throughout the world. ANSYS Mechanical (Workbench) provides ample opportunities for the implementation of project development, analysis and optimization.
10.34910/ALF.12.8
Reinforced structural elements (ZhBEK)
deformation
versatile heating
finite element method (FEM)
ANSYS Mechanical (Workbench)
https://alfabuild.spbstu.ru/article/2019.12.8/
12_8.pdf
RAR
RUS
85-97
Peter the Great St. Petersburg Polytechnic University
Desyatova
Polina
desyatovapolina@gmail.com
St. Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Dronov
Danil
dronovdanil@mail.ru
St. Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Nenashev
Valentin
v.s.nenashev@gmail.com
St. Petersburg, Russia
Graphic comparison of masonry compressive strength formulas
The need to use non-destructive methods for studying the strength of brick structures is an urgent task today. One of the non-destructive methods is the use of formulas for calculating the compressive strength of brickwork.This article is about a comparative analysis of three empirical formulas for determining the strength of brickwork for compression, used in building codes of Russia and Europe. The graphs below show the dependence of the design values of the ultimate strength of brickwork under compression on the strength of the brick. This makes possible to see the difference in the calculation methods. Moreover, there was a discrepancy found in professor Onyshika's formula during the work from his "Stone-made constructions" monography with formula in Stone-made and armo-stone made constructions guideline. (SNiP II-22-81).
10.34910/ALF.12.9
brick
masonry
compression
formulas
analysis
brickwork
Eurocode
https://alfabuild.spbstu.ru/article/2019.12.9/
12_9.pdf
REV
RUS
98-111
6506030356
0000-0001-6744-9249
Tampere University
Garifullin
Marsel
marsel.garifullin@tuni.fi
Tampere, Finland
Peter the Great St. Petersburg Polytechnic University
Vasileva
Ekaterina
vaska96@yandex.ru
St. Petersburg, Russia
Resistance of welded RHS joints
Welded tubular structures are used in a wide range of trusses and frames. In the design of steel structures, Particular attention is paid to the design of joints. The article presents a literature review on the current design methods and rules for welded rectangular hollow section joints. The review discusses the advantages and disadvantages of the presented design methods. Moreover, attention is paid to the reduction coefficients for joints made of high strength steel, which does not allow to obtain all economic benefits from using high strength steels in the construction industry. In addition, there is still a lack of research on tubular joints under out-of-plane bending.
10.34910/ALF.12.10
welded joint
rectangular hollow section
design of joints
design methods
high strength steel
https://alfabuild.spbstu.ru/article/2019.12.10/
12_10.pdf