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Tytuł:
Investigation of shear stress distribution in a 90 degree channel bend
Autorzy:
Lee, S. K.
Dang, T. A.
Le, V. T.
Powiązania:
https://bibliotekanauki.pl/articles/265109.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
zginanie
naprężenie ścinające
erozja
experimental channel
90 degree bend
shear stress
erosion
deposition
Opis:
Shear stress is a key parameter that plays an important role in sediment transport mechanisms; therefore, understanding shear stress distribution in rivers, and especially in river bends, is necessary to predict erosion, deposition mechanisms and lateral channel migration. The aim of this study is to analyze the shear stress distribution near a river bed at 90-degree channel bend using a depth-average method based on experimental measurement data. Bed shear stress distribution is calculated using the depth-averaged method based on velocity components data has been collected from a 3D-ADV device (three-dimensional acoustic doppler velocity) at different locations of a meandering channel. Laboratory experiments have been made at the hydraulic laboratory of the RCRFIDF (Research Center for River Flow Impingement and Debris Flow), Gangneung-Wonju National University, South Korea to provide data for simulating the incipient motion of the riverbed materials and then predicting the river morphological changes in the curved rivers. The calculated results show that the maximum value of shear stress distribution near the riverbed in the different cross sections of the surveyed channel occurs in a 70-degree cross section and occurs near the outer bank. From the beginning of a 40-degree curved channel section, the maximum value of the shear stress occurs near the outer bank at the end of the channel.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 213-220
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Static bending of isotropic circular cylindrical shells based on the higher order shear deformation theory of Reddy and Liu
Autorzy:
Nwoji, C. U.
Ani, D. G.
Oguaghamba, O. A.
Ibeabuchi, V. T.
Powiązania:
https://bibliotekanauki.pl/articles/2106454.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ścinanie poprzeczne
powłoka Kirchhoffa-Love'a
zginanie
isotropic circular cylindrical shell
shear deformation theory
transverse shear
principle of virtual works
Kirchhoff-Love theory
Opis:
In this paper, a displacement based shear deformation theory formulated on the cubic in-plane displacement field equation of Reddy and Liu is presented for the static bending analysis of isotropic circular cylindrical shells. The adopted displacement field accounts for a quadratic (parabolic) distribution of the transverse shear through the shell thickness as well as satisfies the need for a stress free upper and lower boundary surfaces of the shell. The equations of static equilibrium are obtained on application of the principle of virtual work. Numerical results of the bending analysis for the displacements and stresses are presented for the simply supported shell. A comparison made to those of the Kirchhoff-Love theory for varying shell length to mean – radius of curvature ratios, shows good agreement for thin shells irrespective of the shell length to radius of curvature ratio [...]. The transverse sharing effect is found to be noticeable in the deformation of thick shells, however, this effect diminishes with a continuous increase in [...] ratios.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 3; 141--162
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite Element Modeling of Self-Compacting Concrete Beams Under Shear
Autorzy:
Hosseinimehrab, lham
Sadeghi, Abbasali
Noroozinejad Farsangi, Ehsan
Powiązania:
https://bibliotekanauki.pl/articles/2051577.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
concrete beams
self-compacting concrete
shear capacity
finite element modeling
belka betonowa
beton samozagęszczalny
ścinanie
modelowanie elementów skończonych
Opis:
Development of self-compacting concrete (SCC) is a very desirable achievement in the reinforced concrete (RC) structures for overcoming issues associated with many problems such as congestions of steel reinforcement. This non-vibrating concrete is not affected by the skill of workers, and the shape and amount of reinforcing bar arrangement of a structure. Due to the high fluidity and resisting power of reinforcing of SCC, it can be pumped longer distances. In this study, the finite element (FE) modeling of three SCC beams in shear while taking into account, the flexural tensile strength of concrete is computed and the results are compared with the available experimental tested reinforced SCC beams. The stirrups are located at 75 mm apart from the end of beams up to the loading point. The electrical strain gauges (ESGs) have been embedded on the stirrups and their strain readings are taken for every step of load increment. For modeling longitudinal steel reinforcing bars and concrete, the 3-D elements with 2-node and 8-node, are used respectively. The comparison of results obtained by two methods is indicated that a good satisfactory agreement is achieved.
Źródło:
Civil and Environmental Engineering Reports; 2021, 31, 4; 1-16
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of shear connections in steel-concrete composite structures
Rozwój połączeń ścinanych w stalowo-betonowych konstrukcjach zespolonych
Autorzy:
Biegus, A.
Lorenc, W.
Powiązania:
https://bibliotekanauki.pl/articles/396679.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
steel-concrete structures
composite beam
composite dowels
shear connection
konstrukcje stalowo-betonowe
belka zespolona
połączenie ścinane
Opis:
Different types of shear connectors and modelling techniques are presented. Basic research conducted or presented after year 2000 is taken into consideration, following the idea of concrete dowel implemented in the form of perfobond strip at the beginning of the 1980s by F. Leonhardt. The latest research in the field of continuous shear connectors applied in bridges is high lited with special focus at the composite dowel shear connection, as it seems to be the most modern solution being strongly introduced to the industry. Final shape of composite dowel shear connection is presented.
Przedstawiono typy łączników ścinanych oraz sposoby modelowania. Odniesiono się do badań prowadzonych po 2000 r., pokazano, jak rozwijał się pomysł, wprowadzony w postaci tzw. listwy perfobond, którego autorem był w 1980 r. F. Leonhardt. Najnowsze aplikacje ciągłych łączników ścinanych w mostach wykorzystują łączniki w formie tzw. composite dowels. Ostateczny kształt tego typu łączników przedstawiono w pracy.
Źródło:
Civil and Environmental Engineering Reports; 2014, 15; 23-32
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase velocity and attenuation of longitudinal shear vibrations of hollow poroelastic cylinders
Autorzy:
Ahmed Shah, S.
Javvad Hussaini, S.
Powiązania:
https://bibliotekanauki.pl/articles/955126.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
prędkość fazowa
tłumienie drgań podłużnych
teoria Biota
Biot's theory
hollow cylinder
shear waves
frequency equation
phase velocity
attenuation
wavenumber
dissipation
Opis:
The present paper is devoted to the study of phase velocity and attenuation of longitudinal shear vibrations of hollow poroelastic circular cylinders in the presence of dissipation. The explicit expressions for phase velocity and attenuation of longitudinal shear vibrations are derived. The frequency equation of longitudinal shear vibrations and modes obtained in a previous paper are used to compute the phase velocity and attenuation for different dissipations for thin and thick poroelastic cylindrical shells and poroelastic solid cylinder. The physical parameters of sandstone saturated with kerosene and sandstone saturated with water are used for the purpose of computation. It is found that the phase velocity is linear beyond certain frequency. Phase velocity is smaller for a typical anti-symmetric mode compared to the flexural mode. It is greater for the second mode than that of the first mode. Also the phase velocity is larger for a thin poroelastic cylindrical shell than that of a thick poroelastic cylindrical shell. The same is true for attenuation also. Attenuation is very high for the considered dissipations and it increases with the increase in dissipation.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 2; 337-346
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of the graphical method for plotting the shear and moment diagrams for members subjected to linearly varying loads
Autorzy:
Husain, Muhammed Abbas
Ali, Abdulkhaliq Salim
Powiązania:
https://bibliotekanauki.pl/articles/2174180.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
ścinanie
ścinanie belki
mechanika materiałów
shear diagrams
moment diagram
graphical method
improvement
varying load
Opis:
This study presents an improvement of the graphical method for plotting the shear and moment diagrams for the structural members under linearly varying loads (triangular and trapezoidal loads). Based on the parabolic nature of the shear function, when the loading varies linearly, and on the relations among load, shear, and moment, a mathematical equation is developed to locate the zero-shear point, while a geometric technique is presented to calculate the parabolic shear area. Five comprehensive examples of beams loaded with linearly varying loads are selected to illustrate the steps of the solution for the proposed techniques. The results demonstrated the applicability of the presented method, and gave exact diagrams compared with the basic graphical method. It is concluded that the proposed improved method is generally more convenient, less time-consuming, and has less computational efforts because it does not require sectioning, solving equilibrium equations, and quadratic formulas compared with the basic graphical method.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 46--66
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fourth order nonlinear evolution equation for interfacial gravity waves in the presence of air flowing over water and a basic current shear
Autorzy:
Majumder, D. P.
Dhar, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/265668.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
nonlinear evolution equation
basic current shear
Stokes gravity wave
równania nieliniowe
przepływy Stokes'a
grawitacja
Opis:
A fourth order nonlinear evolution equation, which is a good starting point for the study of nonlinear water waves as first pointed out by Dysthe (1979) is derived for gravity waves propagating at the interface of two superposed fluids of infinite depth in the presence of air flowing over water and a basic current shear. A stability analysis is then made for a uniform Stokes gravity wave train. Graphs are plotted for the maximum growth rate of instability and for wave number at marginal stability against wave steepness for different values of air flow velocity and basic current shears. Significant deviations are noticed from the results obtained from the third order evolution equation, which is the nonlinear Schrödinger equation.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 3; 517-530
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural aspects of railway truss bridges affecting transverse shear forces in steel-concrete composite decks
Konstrukcyjne aspekty kolejowych mostów kratownicowych decydujące o poprzecznych siłach rozwarstwiających w pomostach zespolonych
Autorzy:
Siekierski, W.
Powiązania:
https://bibliotekanauki.pl/articles/396261.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
composite deck
shear force
truss bridge span
pomost zespolony
siły ścinające
most kratownicowy
most kolejowy
Opis:
At the steel-concrete interface, the horizontal shear forces that are transverse to cross beams occur due to joint action of the steel-concrete composite deck and the truss girders. Numerical analysis showed that values of the forces are big in comparison to the longitudinal shear forces. In both cases extreme force values occur near side edges of a slab. The paper studies possibilities of reduction of these shear forces by structural alterations of the following: rigidity of a concrete slab, arrangement of a wind bracing, arrangement of concrete slab expansion joints. An existing railway truss bridge span has been analysed. Numerical analysis shows that it is possible to reduce the values of shear forces transverse to cross beams. It may reach 20% near the side edges of slabs and 23% in the centre of slab width.
Współpraca pomostu zespolonego z kratownicowymi dźwigarami głównymi wzbudza poprzeczne siły rozwarstwiające w styku belek poprzecznych i betonowej płyty pomostowej. W pracy przeanalizowano numerycznie wpływ niektórych aspektów konstrukcyjnych przęsła kratownicowego mostu kolejowego na poprzeczne siły rozwarstwiające w pomoście zespolonym. Wykorzystano model obliczeniowy zweryfikowany wynikami badań przęsła pod próbnym obciążeniem. Analizowano wpływ czterech modyfikacji układu istniejącego, uwzględnionego w modelu pierwotnym. Były to m.in.: odmienny układ stężeń wiatrowych („X” zamiast „K”), mniejszy rozstaw poprzecznych przerw dylatacyjnych w płycie pomostowej (trzy w przęśle zamiast jednej). Stwierdzono, że zmiana układu stężeń wiatrowych wywołuje największą redukcję ekstremalnych poprzecznych sił rozwarstwiających w środku szerokości płyty, natomiast zwiększenie liczby poprzecznych przerw dylatacyjnych płyty powoduje największą redukcję poprzecznych sił rozwarstwiających w sąsiedztwie bocznych krawędzi płyty. Zabiegi zmiany układu stężeń wiatrowych w poziomie pomostu oraz zwiększenia liczby dylatacji płyty pomostu, zastosowane w istniejących kolejowych mostach kratownicowych z pomostem zespolonym, spowodują także redukcję wytężenia poprzecznic w połączeniach z dźwigarami głównymi.
Źródło:
Civil and Environmental Engineering Reports; 2014, 15; 113-126
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Undrained shear and pore space characteristics of treated loose sands with lime-activated zeolite in saturated settings
Autorzy:
Jamhiri, Babak
Pakbaz, Mohammad Siroos
Powiązania:
https://bibliotekanauki.pl/articles/1838092.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
lime alkali
compressive strength
shear strength
void ratio
pore water pressure
B-ratio
wapno alkaliczne
wytrzymałość na ściskanie
wytrzymałość na ścinanie
ciśnienie wody
Opis:
This research investigates the mechanical behavior of artificially cemented sandy soils formed by lime alkali activation of natural zeolite under saturation settings. In order to verify the bar capability of cemented sands with this new method, an analysis of the undrained shear strength of the soil with pore water pressure ratio measurements was performed from the interpretation of the results of unconfined compression tests. The effect of zeolite-lime blend on treated sands was also visualized by scanning electron microscopy. For the studied soils, it was concluded from the unconfined compression stress values that the soil is fully capable of withstanding compressions due to overburden pressure. Additionally, this study seeks to evaluate the effect of the void ratio on the pore space and undrained shear strength. The results showed that pore water B-ratio increases with the decrease of the void ratio. Moreover, with the increase of zeolite content, confining pressure, and curing age, the peak failure strength increases. The results indicated a promising consistency of treated samples with lime and zeolite under various values of undrained shearing and B-ratios, making this method an ideal treatment for loose sand deposits.
Źródło:
Civil and Environmental Engineering Reports; 2020, 30, 2; 105-132
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Shear Resistance in the Indented Interface Between Two Concrete Parts of Concrete Composite Beam
Autorzy:
Sadowski, Grzegorz
Wiliński, Piotr
Halicka, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1838103.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Opis:
This paper presents a comparative analysis of shear resistance in the interface between two concrete parts of concrete composite beam. The construction joint was performed as indented one in accordance with Eurocode 2 and fib Model Code 2010. The numerical calculation results were confronted with the actual results of tests of a composite beam subjected to 4-point bending. The displacement values of tested element were obtained using dial sensors and the digital image correlation method (DIC). The analysis shows that the recommendations of Eurocode 2-1-1 and fib Model Code 2010 do not reflect the actual behavior of concrete composite beam with indented surface.
Źródło:
Civil and Environmental Engineering Reports; 2021, 31, 1; 93-105
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on the Significance of the Design Parameters of Steel Plate Shear Walls Subjected to Monotonic Loading
Autorzy:
Honarmand, Saeed
Homami, Peyman
Gharehbaghi, Vahidreza
Noroozinejad Farsangi, Ehsan
Powiązania:
https://bibliotekanauki.pl/articles/1838088.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
steel plate shear walls
SPSWs
sensitivity analysis
Monte-Carlo simulation
seismic load
monotonic loading
ściany z blachy stalowej
analiza wrażliwości
metoda Monte Carlo
obciążenia sejsmiczne
obciążenie monotoniczne
Opis:
Steel plate shear walls (SPSWs) as a resistant system against lateral loads have a high potential for earthquake energy dissipation. Due to the uncertainties of loading, construction, and installation of SPSWs, it is vital to investigate the importance of each component and achieve higher accuracy in design and the implementation of these members. In this paper, a sensitivity analysis is carried out to determine the significance of important uncertainties. The results denoted that the most important parameters affecting the loading capacity of the SPSWs are height, thickness, length, Young's modulus of the wall material, flange, and web thickness of the column, respectively.
Źródło:
Civil and Environmental Engineering Reports; 2020, 30, 4; 142-154
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of transverse shearing and rotatory inertia on the vibrations of fibrous composite beam
Autorzy:
Gołaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/396585.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
dźwigary
drgania
odkształcenia
dynamics of composite beam
transverse shear effect
Opis:
The aim of the paper was to determine the influence of transverse shear deformation and rotatory inertia on the natural frequencies and on the values of displacements of beams made of fibrous composites reinforced with layers' of long fibres. It was assumed that the matrix of the composite beam possesses linear elastic and transversaIly isotropic properties. Moreover a reinforcement in the form of layers composed of long fibres symmetricaIly located in the cross section was considered. In order to describe the displacement and strain state of the matrix, Timoshenko theory was assumed. Using the complete analytical solutions obtained in the paper the accuracy analysis of results was performed in comparison with the theory of Bernoulli beam.
Źródło:
Civil and Environmental Engineering Reports; 2009, 3; 23-36
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation of cementitious materials using the prism technique
Autorzy:
Messaoudi, Rahma
Bouzerira, Cherif
Grimes, Morad
Oucief, Hocine
Powiązania:
https://bibliotekanauki.pl/articles/396269.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
prism technique
cementitious material
compressional wave
shear wave
reflection coefficient
technika pryzmatyczna
materiał cementowy
ściskanie
fala uderzeniowa
współczynnik odbicia
Opis:
Numerous studies have shown that the non-destructive testing has proved the exceptional role in supervising the quality of concrete. Today, they represent an alternative that contributes to the resolution of materials diagnostic problems without altering them. This work presents an experimental study using a pulse-echo method that has the advantage of generating two types of wave (compressional and shear) by a mode conversion using just one transducer. The samples were made in a prismatic form. The results recovered from backscattered echoes are extracted using an estimation algorithm. These data were exploited to determine velocities of the tested material then the reflection coefficients for related them with the compressive strength. The tests were conducted with six samples with varied water/cement ratio. The results obtained showed that the prism technique has the potential to evaluate characteristics cementitious material using this proposed process.
Źródło:
Civil and Environmental Engineering Reports; 2020, 30, 1; 196-212
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid sandwich panels: a review
Autorzy:
Sandeep, S. H.
Srinivasa, C. V.
Powiązania:
https://bibliotekanauki.pl/articles/1839800.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
belka
laminat
drgania
odkształcenie
beams
shells
fibre metal laminate
free vibration
natural frequency
sandwich plates
sandwich cylindrical shells
beams theories
higher-order theory
shear deformation theory
Opis:
A high specific stiffness, high specific strength, and tailoring the properties for specific application hale attracted the attention of the researchers to work in the field of laminated composites and Sandwich structures. Rapid use of these laminated composites and Sandwich structures necessitated the development of new theories that suitable for the bending, buckling and vibration analysis. Many articles were published on free vibration of beams, plates, shells laminated composites and sandwich structures. In this article, a review on free vibration analysis of shear deformable isotropic beams, plates, shells, laminated composites and sandwich structures based on various theories and the exact solution is presented. In addition to this, the literature on finite element modeling of beams, plates, shells laminated composites and sandwich structures based on classical and refined theories is also reviewed. The present article is an attempt to review the available literature, made in the past few decades on free flexural vibration response of Fiber Metal laminated Composites and Sandwich panels using different analytical models, numerical techniques, and experimental methods.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 64-85
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flexural behaviour of a cold-formed steel-concrete composite beam with channel type shear connector – an experimental and analytical study
Autorzy:
Palanivelu, Sangeetha
Powiązania:
https://bibliotekanauki.pl/articles/396667.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
composite beam
beam
cold-formed steel
channel connectors
load
belka stalowo-betonowa
kompozyt
złącze kanałowe
obciążenie
Opis:
Steel-concrete composite structures are widely used in the current construction of bridges and multi-storey buildings. The effect of shear connectors in a cold-formed steel-composite beam was studied under flexure. The number of channel connectors in the specimen was varied and the same was compared with a specimen without shear connectors. The performance and failure of cold-formed steel-composite beams were then studied. The presence of shear connectors in the tension zone prevents the formation of cracks which are the major cause of failure in a beam subjected to bending. The load carrying capacity is greater in a composite beam and an increase in the number of channel connectors from one to five increases the load-carrying capacity by 60 % as compared to a specimen without a connector. A composite beam with five connectors is more ductile, with a ductility factor of 14. The Composite beams were also analysed using the finite element software ANSYS and were found to have good agreement with the experimental results.
Źródło:
Civil and Environmental Engineering Reports; 2019, 29, 3; 228-240
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
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