75504
2712-8172
Magazine of Civil Engineering
1
101
2021
1-168
RAR
RUS
10101-10101
0000-0001-8690-4999
Ltd"Non-state expertise of the Pskov region"
Selyantsev
Ilya
iselyantsev@gmail.com
Pskov, Russia
Moscow State University of Civil Engineering
Tusnin
Alexandr
valeksol@mail.ru
Moscow, Russia
Cold-formed steel joints with partial warping restraint
The article investigates the influence of joints on the warping torsion of cold-formed steel bars. The modern warping torsion theory suggests cold-formed steel bars to be simply supported or fixed at the
ends. Simple support provides zero warping restraint. Fixed support provides fool warping restraint at the joint of the bar. In real constructions cold-formed steel joints are partial warping restrained. Not considering the partial restraint of deplanations by real joints leads to an incorrect assessment of the twist angles and the stress state of thin-walled steel bars in warping torsion. This article deals with an experimental and analytical investigation of warping torsion of cold-formed steel bars with bolted joints. Considered 142C16, 142C20, 262C23 and 262C29 sections. Five types of joints considered: a wall and both flanges of the bar end sections are fixed; the upper and lower flanges are fixed; the wall is fixed; the wall and the lower flange are fixed; the lower flange is fixed. First, analytical expressions for twist angles and bimoments for warping torsion for bars with partial warping restraints obtained. Analytical results are compared with the results of the warping torsion experiment conducted at Moscow State University of Civil Engineering. The cold-formed steel specification is shown to be a poor predictor for the twist angle and bimoment value of twisting members. The warping factor coefficient is recommended for the estimation of the degree of the joint warping constraint. Experimental values of warping factors for different joint types are obtained. The influence of partial warping restraints and cross-section deformation on the work of the tested cold-formed steel bars are evaluated.
10.34910/MCE.101.1
cold-formed structures
warping tests
semi-rigid joints
partial restraints
warping factor
warping restraint
https://engstroy.spbstu.ru/article/2021.101.1/
01.pdf
RAR
RUS
10102-10102
University of Jordan
El-Nimri
Rola
rola.elnimri@gmail.com
Amman, Jordan
8957291500
0000-0003-2980-9084
University of Jordan
Abdel-Jaber
Mu'tasim
m.abduljaber@ju.edu.jo
Amman, Jordan
6602257335
University of Jordan
Hunaiti
Yasser
hunaiti@ju.edu.jo
Amman, Jordan
23466163300
AlHussein Technical University
Abdel-Jaber
Ma'en
maen.abdel-jaber@htu.edu.jo
Amman, Jordan
Behavior of light-gauge steel beams filled with recycled concrete
This paper presents an experimental and a numerical investigation of light-gauge steel box sections filled with concrete made with a combination of natural aggregate (NA), recycled concrete aggregate (RCA), and recycled asphalt pavement (RAP). A total of 47 specimens, including 30 composite beams, 15 plain concrete beams, and 2 bare steel beams were tested. The main variables in the tests were the steel thickness (2 and 2.4 mm), the coarse aggregate type and replacement ratios. NA was replaced by RCA and RAP with replacement levels of 20 %, 40 %, 60 %, 80 %, and 100 % by the total weight of NA. In addition, RCA and RAP were incorporated in the same mixes with four replacement levels of (20 % RCA and 80 % RAP); (40 % RCA and 60 % RAP); (60 % RCA and 40 % RAP); and finally, with (80 % RCA and 20 % RAP). The experimental capacities were compared to the theoretical prediction of EC4, AISC-LRFD, AIJ, and the Rigid Plastic Theory (RPT). Moreover, a finite element analysis (FEA) was performed using ABAQUS software. The experimental results showed that the ultimate capacity of composite beams decreased with the increase of RCA and RAP percentage. However, both RCA and RAP enhanced the capacity of plain concrete beams. Current code provisions predicted lower capacities than the experimental values, and the FEA results showed reasonable agreement with the test results.
10.34910/MCE.101.2
concretes
recycling
concrete aggregates
asphalt
composite materials
finite element method
https://engstroy.spbstu.ru/article/2021.101.2/
RAR
RUS
10103-10103
0000-0001-8067-9137
Donbas National Academy of Civil Engineering and Architecture
Zaichenko
Nikolai
zaichenko_nikola@mail.ru
Makiyivka, Ukraine
57205075525
0000-0003-1212-4038
Donbas National Academy of Civil Engineering and Architecture
Nefedov
Vladislav
vlad.n1991@gmail.com
Makiyivka, Donetsk region, Ukraine
Poly(ethylene terephthalate) composite material with modified fly ash filler
The effect of the fly ash (FA) filler modified by sulphuric acid on the mechanical and physical properties of poly(ethylene terephthalate) composite material (PCM) has been investigated. The results of the presented study can be formulated as follow. The element and oxide composition of original (as received) fly ash is affected by the modification of sulphuric acid of 5 % concentration. At the same time, the variations in the particle size distribution of filler can be observed. In particular, the modified FA filler has an increased content of fine particles. The XRD pattern of as received fly ash indicates the presence of both crystalline (25 %) and amorphous phases (75 %) while XRD pattern of FA after chemical modification points to the fact that the content of crystalline phase has been increased up to 40 % but the content of amorphous phase has been decreased up to 60 %. The results of mechanical and physical properties of PCM with various content of unmodified fly ash filler (55, 60, 65, 70, and 75 %) indicate that compressive and flexural strength tends to rise with increasing concentration from 55 to 65 percent. In the certain case when the fly ash filler is modified by sulphuric acid of 5 % concentration, the values of compressive and flexural strength of PCM at 65 % FA loading is higher than compared with PCM on the base of unmodified filler. The strength gain may be attributed to the increasing crystallinity in the recycled poly(ethylene terephthalate) (rPET) matrix of the composite material as the fly ash content is increased. The XRD, DTA/TGA data of pure rPET and PCM are in conformity with the results of mechanical and physical properties of PCM.
10.34910/MCE.101.3
poly(ethylene terephthalate) composite material
fly ash filler
crystallinity
modification
sulphuric acid
mechanical and physical properties
https://engstroy.spbstu.ru/article/2021.101.3/
03.pdf
RAR
RUS
10104-10104
Moscow State University of Civil Engineering (National Research University)
Inozemtcev
Sergei
inozemcevss@mgsu.ru
37099331400
0000-0003-0815-4621
Moscow State University of Civil Engineering (National Research University)
Korolev
Evgeniy
korolev@nocnt.ru
Moscow, Russia
Sodium alginate emulsions for asphalt concrete modifiers encapsulating: structural rheological properties
The ratio of components for the production of alginate emulsions are established, which can be used in the design of compositions for encapsulating various types of reducing agents. The high resistance of alginate emulsions to segregation corresponds to a structured system, the onset of the destruction of which is determined by the ratio O/A. The structure of stable alginate emulsions is characterized by an average particle size of the dispersed phase from 5 to 7 μm, the average distance between which is from 7 to 9 μm. The change in the particle size distribution of the dispersed phase occurs during the process of water evaporation from the alginate emulsion, which is explained by a decrease in the volume of the dispersion medium, the approach of the particles, their collision, compression, and pooling. An increase in particle diameter occurs on average by 28 % over 5 days, which is accompanied by an increase in viscosity by 4 times.
10.34910/MCE.101.4
emulsion
sodium alginate
rheology
structure
encapsulation
self-healing
asphalt concrete
asphalt
pavement
durability
https://engstroy.spbstu.ru/article/2021.101.4/
04.pdf
RAR
RUS
10105-10105
57115416200
0000-0002-0707-6660
Jimma University
Zerfu
Kefiyalew
kefiyalewz@gmail.com
Jimma, Ethiopia
35107085200
0000-0002-9547-8132
Institut Teknologi Sepuluh Nopember
Ekaputri
Januarti Jaya
januarti_je@yahoo.com
Surabaya, East Java, Indonesia
Bond strength in PVA fibre reinforced fly ash-based geopolymer concrete
This paper presents the effect of polyvinyl alcohol (PVA) fibre on the bond strength in geopolymer concrete. The main focus of the study is to investigate how bond performance is affected by varying the amount of PVA fibre content. The PVA fibre content of 0 %, 0.2 %, 0.4 %, 0.6 % and 0.8 % by volume of concrete were utilized. Alkali activated class F fly ash was used to prepare the concrete specimens. Moreover, the Ordinary Portland cement (OPC) specimen was also prepared to conduct the comparative study. The results showed that the application of PVA fibre improves the bond resistance between the pull-out bar and concrete matrix. It has been investigated that the utilization of PVA fibre in geopolymer concrete improves up to 25.9 % bond strength as compared with the concrete without PVA fibre. The addition of PVA fibre provides a more ductile mode of failure in both geopolymer and OPC concrete than to the concrete without PVA fibre. For the different percentages of PVA fibre used, the specimen with 0.6 % PVA fibre shows maximum compressive strength, splitting and bond strength. The comparative study reveals that the specimen with and without PVA fibre blended geopolymer concrete shows higher bond strength than OPC concrete.
10.34910/MCE.101.5
PVA fibre
geopolymer concrete
bond strength
pull-out test
fly ash
alkali solution
mechanical properties
https://engstroy.spbstu.ru/article/2021.101.5/
05.pdf
RAR
RUS
10106-10106
0000-0002-9089-4540
Faculté de Génie Civil / USTHB Laboratoire de recherche Environnement, Eau, Géomécanique et Ouvrages (LEEGO)
Saoudi
Brahim
saoudibra@yahoo.fr
Bab Ezzouar, Algérie
0000-0002-3212-0205
Faculté de Génie Civil / USTHB Laboratoire de recherche Environnement, Eau, Géomécanique et Ouvrages (LEEGO)
Haddadi
Smail
smail_haddadi@yahoo.fr
Bab Ezzouar, Algérie
Predicting creep deformation of asphalts modified with polymer using artificial neural networks
This study presents an application of the Artificial Neural Networks (ANN) for creep rate prediction of asphalt concrete modified with different rubber contents. Acrylonitrile butadiene rubbers (NBR) under powder form are used in this study. The polymer is an industrial waste produced by the Algerian Elastomer Company. The most appropriate model is the multilayer back propagation network. It is produced to implement the complexity of the non-linear between the data network and the product result. It is established by the incorporation of an important experimental database and by an appropriate choice of the architecture and of the learning process. We will show that the developed ANN model received rubber contents, test temperature, compactness and the loading stress as the input and provided the creep rate as the output has better capability to predict the final creep rate in a short time with low error. The model is further applied to evaluate the effect with different contents of polymer on creep rate of bituminous concrete modified. Obtained results show that creep rate is reduced at 2 % of polymer adding. However, an increase in percentage of additives over 2 % does not help to reduce permanent deformation of asphalt mixtures. ANN model introduced provided a more accurate tool for the design of bituminous concretes modified.
10.34910/MCE.101.6
Neural Networks
asphalt concrete
static creep test
creep rate
rubber contents
https://engstroy.spbstu.ru/article/2021.101.6/
06.pdf
RAR
RUS
10107-10107
57212346689
0000-0002-4699-8166
Peoples Friendship University of Russia (RUDN University)
Chiadighikaobi
Paschal Chimeremeze
passydking2@mail.ru
Moscow, Russia
Kharun
Makhmud
miharun@mail.ru
https://orcid.org/0000-0003-2493-7255
Peoples' Friendship University of Russia (RUDN University)
Galishnikova
Vera
galishnikova-vv@rudn.ru
Moscow, Russia
Peoples Friendship University of Russia (RUDN University)
Koroteev
Dmitry
koroteev-dd@rudn.ru
Moscow, Russia
Basalt fiber reinforced expanded clay concrete for building structures
Expanded clay concrete is a perspective structural material because of its lightweight, heat and sound insulating properties. However, due to its brittleness and low strength to flexure and compression it cannot be used in load bearing structures. Adding basalt fiber in concrete increases mechanical properties. The research work presents an experimental study of the mechanical behavior of structural expanded clay basalt fiber concrete. The main purpose of this study was to test the effect of chopped basalt fiber in expanded clay concrete to improve its strength. An experimental characterization of mechanical behavior by compressive and flexural tests was achieved. Dispersed chopped basalt fiber was used as reinforcement of specimens with sizes of 100×100×100 mm and 100×100×400 mm. Mathematical models for determining the compressive strength and the flexural strength of the expanded clay concrete depending on the proportion of basalt fiber and the curing period are developed. The finite element analysis was done by using ANSYS software, a model was developed to validate the different results obtained experimentally. The experimental results show that high percent of basalt fiber in the expanded clay concrete gives higher strength. In effect, an influence directly on the failure mode was observed on expanded clay concrete without basalt fiber and then read by the value of strength and ultimate deformation.
10.34910/MCE.101.7
expanded clay concrete
basalt fiber
compressive strength
flexural strength
finite element analysis
https://engstroy.spbstu.ru/article/2021.101.7/
07.pdf
RAR
RUS
10108-10108
0000-0003-3011-8651
Mientrung University of Civil Engineering
Duy
Nguyen Phan
nguyenphanduy@muce.edu.vn
Tuyhoa, Phuyen, Vietnam
15838281100
Mientrung University of Civil Engineering
Anh
Vu Ngoc
vungocanh@muce.edu.vn
Tuyhoa, Phuyen, Vietnam
55366706300
0000-0003-2470-4005
Hanoi Architectural University
Hiep
Dang Vu
Thanhxuan, Hanoi, Vietnam
0000-0003-1572-4602
Mientrung University of Civil Engineering
Anh
Nguyen Minh Tuan
nguyenminhtuananh@muce.edu.vn
Tuyhoa, Phuyen, Vietnam
Strength of concrete columns reinforced with Glass fiber reinforced polymer
Due to low compressive strength and low compressive elastic modulus in comparison with these in tension, GFRP reinforcement is often used for bending elements and is rarely used for compressive structures. In this paper, the authors used finite element (FE) method based on Abaqus software to evaluate the axial load-carrying capacity of GFRP reinforced concrete (RC) columns under varying concrete grades, GFRP reinforcement ratios and tie configurations. The model of the specimens is developed using concrete damage plastic (CDP) model and linear elastic material model for GFRP bar. The consistence of the FE method is verified by the experimental results of a series of columns that tested by current authors. The analytical results show that the selected numerical method can accurately predict the behavior as well as the ultimate capacity of the columns. From simulation results, it is clear that the contribution of GFRP to the load-carrying capacity is considerable in columns with low concrete grades. While using higher concrete grades, the contribution of GFRP decrease, at concrete grade B60, contribution of GFRP is almost unimportant (2.74 %). Influence of tie spacing on load-bearing capacity of columns is also investigated. Accordingly, reducing tie spacing leads to increase load-carrying capacity. Based on study results, the authors recommend to limit tie spacing less than eight times of the GFRP bar diameter.
10.34910/MCE.101.8
Finite element
glass fiber reinforced polymer (GFRP)
reinforced concrete column
Abaqus
concentric compression
https://engstroy.spbstu.ru/article/2021.101.8/
08.pdf
RAR
RUS
10109-10109
0000-0001-5132-4978
National Institute of Technology Calicut
Jose
Alex
alexjose.scaria@gmail.com
Kozhikode, Kerala, India
0000-0001-6160-4068
National Institute of Technology Calicut
Kasthurba
Ayikkara
kasthurba@nitc.ac.in
Kozhikode, Kerala, India
Stabilization of lateritic soil for masonry applications
10.34910/MCE.101.9
durability
compressive strength
water absorption
ordinary portland cement
scanning electron microscopy
https://engstroy.spbstu.ru/article/2021.101.9/
RAR
RUS
10110-10110
56825555100
0000-0001-6865-245X
Peter the Great Saint Petersburg Polytechnic University
Nikonorov
Aleksandr
coolhabit@yandex.ru
St. Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University
Badenko
Vladimir
vbadenko@gmail.com
St. Petersburg, Russia
Flood events dynamics estimation methodology in a GIS environment
Hard floods of rare frequency can cause significant damage to the ecosystem of the river basin, as well as to settlements and infrastructure. Therefore, the urgent task is to develop sustainable measures of minimization of the dangerous effects of these phenomena. One of the feasible technical measure is the construction of a self-regulating flood control dams with temporarily filled reservoirs system in the river basin. This article proposes an improved technique for flood events modeling, taking into account the proposed measures. The proposed method is based on the modeling in a GIS environment coupled with hydrologic simulation software. GIS modeling is preceded by the development of the digital elevation model. According to the results of the research, the requirements for the input data were formulated. An algorithm for creating models was given, as well as examples of already created models. The viability of this technique is shown, together with the limitations identified during the simulation.
10.34910/MCE.101.10
river basins
floods
flood protection
self-regulated dams
GIS environment
https://engstroy.spbstu.ru/article/2021.101.10/
10.pdf
RAR
RUS
10111-10111
Peter the Great St. Petersburg Polytechnic University
Matskina
Margarita
rmatskina@gmail.com
St. Petersburg, Russia
57196054199
0000-0002-0840-6828
Peter the Great St. Petersburg Polytechnic University
Radaev
Anton
TW-inc@yandex.ru
St. Petersburg, Russia
Peter the Great Saint Petersburg Polytechnic University
Petrochenko
Marina
mpetroch@mail.ru
Polytechnicheskay, 29
Stochastic model of the construction process implemented with application of sliding formwork
The paper covers issues connected to the determination of most preferred values for the parameters of construction processes implemented with application of sliding formwork and defined by the factors of stochastic nature. On the basis of the review of different literature sources connected to the modeling of mentioned above processes it has been concluded that existing scientific developments provide relatively low adequacy of the results due to the simplified mathematical models that don’t take into account stochastic factors. That circumstance has determined the necessity for creation of stochastic model for the construction process implemented with sliding formwork. The initial data for the model include baseline duration of the wall construction process, wall height, concrete layer thickness, characteristics of stochastic values of the concrete layer’s pouring and maturing duration (mathematical expectation and mean-square deviation), etc.; parameters to be determined are the sliding formwork’s panel height and movement base (average) speed. The created model has been implemented on the practical example – wall construction process as the element of the project “Arctic NLG 2”. On the basis of the received results the conclusion has been made about high practical significance of the developed tool.
10.34910/MCE.101.11
construction
sliding formwork
concrete layer
comcrete maturing
concrete pouring
stochastic model
https://engstroy.spbstu.ru/article/2021.101.11/
11.pdf
RAR
RUS
10112-10112
0000-0003-1364-7041
Department of Civil Engineering, Semnan University
Safari Tarbozagh
Alireza
asafari@semnan.ac.ir
Semnan, Iran
23098221100
0000-0002-4753-7775
Department of Civil Engineering, Semnan University
Rezaifar
Omid
orezayfar@semnan.ac.ir
Semnan, Iran
0000-0002-9904-8623
Department of Civil Engineering, Semnan University
Gholhaki
Majid
mghlhaki@semnan.ac.ir
Semnan, Iran
Silica concrete compressive behavior under alternating magnetic field
Due to the importance of inventing new techniques capable of enhancing concrete structural properties while reducing environmental issues associated with CO2 emissions in concrete industry, which preoccupies environmental scientists, a novel investigation was performed on feasibility of benefitting from Alternating Magnetic Field (AMF) and silica particles to attain this goal. Hence, some experiments were conducted on cylindrical concrete specimens comprising different silica sand contents of up to 10 %, wherein the influence of exposing fresh and hardened concrete to AMF of frequency 50 Hz and density 0.5 Tesla (T) on compressive strength of 7 and 28-day specimens was evaluated. For this, a specialized test setup was assembled such that the specimen could be subjected to compressive force and AMF, simultaneously. It was found that AMF can improve concrete compressive strength, where this technique is more efficient as to exposing hardened concrete. What was significant about the results was the fact that adding silica sand not only improved concrete mechanical strength but also considerably enhanced the effectiveness of AMF in increasing concrete compressive strength, when applied to hardened concrete. For instance, replacing 10 % of cement content with silica sand increased compressive strength of 28-day specimens by 8.4, but adding 10 % silica sand along with exposing specimens to AMF yielded an increase of nearly 21 % in real-time. Thus, developing this method can result in a new generation of smart constructions. Moreover, by adding 10 % silica sand, the emission of carbon dioxide, a greenhouse gas, reduces by 10 percent while significantly enhancing compressive strength.
10.34910/MCE.101.12
Alternating Magnetic Field (AMF)
concrete
silica sand
compressive strength
magnetic circuit
https://engstroy.spbstu.ru/article/2021.101.12/
12.pdf
RAR
RUS
10113-10113
6506150284
0000-0003-1139-3164
Moscow State University of Civil Engineering (National Research University)
Sainov
Mikhail
mp_sainov@mail.ru
Moscow, Russia
Strength of ultra-high rockfill dam concrete face
The problem of providing safety to ultra-high rockfill dams with concrete faces is urgent and unresolved. It is proved by the facts of face structural failure of several ultra-high dams. As a rule, these facts are attributed to the face non-uniform bending deformations or are explained by high compressive stresses in the face central part. With the aid of numerical modeling the author investigated the conditions of forming stress-strain state (SSS) of ultra-high rockfill dams with concrete faces. Analysis was made of internal forces appearing in a concrete face: longitudinal forces and bending moments. It was established that high tensile stresses are most dangerous for concrete face strength in ultra-high rockfill dams. They create a threat by formation of horizontal and inclined cracks oriented along the contact with the foundation. These tensile stresses are the result of not only concrete face transverse bending deformations but also the presence of longitudinal tensile forces and longitudinal bending deformations in it. It is possible to minimize the impact of these adverse effects by decreasing friction at the contact of the face with the dam, however, this does not provide favorable SSS of the concrete face. It is necessary to take special measures on concrete face SSS regulation. Namely, it was established that rockfill deformation modulus should make up at least 300÷400 MPa. Absence of precedent cases of crack formation in the faces of the existing ultra-high rockfill dams may be explained by relaxation of stresses due to creep of concrete.
10.34910/MCE.101.13
concrete faced rockfill dam (CFRD)
strength
stress-strain state
bending moment
longitudinal force
concrete deformation modulus
longitudinal bending
https://engstroy.spbstu.ru/article/2021.101.13/
RAR
RUS
10114-10114
Peter the Great St. Petersburg Polytechnic University
Badenko
Vladimir
vbadenko@gmail.com
St. Petersburg, Russia
Peter the Great Saint Petersburg Polytechnic University
Bolshakov
Nikolai
nikolaybolshakov7@gmail.com
Polytechnicheskay, 29
Moscow State University
Tishchenko
Elena
elenasemenova@bk.ru
Moscow, Russia
Peter the Great St. Petersburg Polytechnic University
Fedotov
Аlexandr
afedotov@spbstu.ru
St. Petersburg, Russia
Politecnico di Milano
Celani
Alberto
alberto.celani@polimi.it
Milan, Italy
Peter the Great St. Petersburg Polytechnic University
Yadykin
Vladimir
St. Petersburg, Russia
Integration of digital twin and BIM technologies within factories of the future
10.34910/MCE.101.14
building information modelling
BIM
operation and maintenance
digital twin
digital asset
Industry 4.0
facility management
https://engstroy.spbstu.ru/article/2021.101.14/