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    Wyświetlanie 1-8 z 8
    Tytuł:
    Finite element analysis on the flexural behaviour of concrete filled steel tube beams
    Metoda elementów skończonych w badaniu właściwości stalowych kolumn
    Autorzy:
    Arivalagan, S.
    Kandasamy, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/280039.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    finite element analysis
    concrete filled steel tubes
    normal mix concrete
    quarry waste concrete
    Opis:
    Concrete-filled steel tube (CFST) beams are studied and verified by the Finite Element program ANSYS against experimental data. In the nu- merical analysis, the cross sections of the CFST are square steel sections, and sections strengthened by being filled with normal mix concrete and quarry waste concrete. Numerical analyses have shown that for square CFST a good confining effect can be provided. This effect is enhanced especially by the filling.
    W pracy przedstawiono analizę porównawczą wyników eksperymentalnych i otrzymanych z metody elementów skończonych (ANSYS) w odniesieniu do kolumn zbudowanych ze stalowych rur wypełnionych betonem (CFTS). Analizę numeryczną przeprowadzono dla kolumn o przekroju kwadratowym wzmacnianym normalną mieszanką betonową oraz betonem zawierającymodpady z kamieniołomu. Rezultaty symulacji numerycznych pokazały, że dla kolumn CFTS o przekroju kwadratowym uzyskuje się dobry efekt wzmocnienia wynikający z wypełnienia.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2010, 48, 2; 505-516
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Employment of recycled wood waste in lightweight concrete production
    Autorzy:
    Alharishawi, Salam Salman Chiad
    Abd, Haitham Jameel
    Abass, Suha Rasheed
    Powiązania:
    https://bibliotekanauki.pl/articles/1849785.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    beton lekki
    kruszywo lekkie
    trociny
    włókno drzewne
    odpad drzewny
    beton zwykły
    lightweight concrete
    lightweight aggregate
    sawdust
    wood fiber
    wood waste
    normal concrete
    Opis:
    The by-products of wood sawdust and wood fiber are considered to be waste material. It is utilized in the construction of buildings in the form of sawdust concrete or wood fiber concrete. It is used to make lightweight concrete and possesses heat transfer of a long duration. In this study, wood concrete was made at eleven different mix proportions of cement to wood waste by weight, to produce a lightweight concrete aggregate that has the density 1508-2122 kg/m3. The experimental work consists of 330 concrete specimens as 99 cubes (150 * 150 * 150) mm, 165 cylinders (150 * 300) mm, 33 prisms (50 * 100 * 200) mm, and 33 prisms (100 * 100 * 500) mm. Mechanical and thermal properties such as stiffness, workability, compressive strength, static elasticity modulus, flexural forces, splitting tensile strength and density were examined in the specimens after 28 days of 20 oC curing. Also, compressive strength was investigated at 7 and 14 days of curing at 20 oC. The basic observation of the results shows the values with the limitations of ACI and ASTM. Moreover, it is the perfect way to reduce solid wood waste and produce lightweight concrete to be used in industrial construction. It was found that with the increase in the quantity of wood waste, the strength decreased; however, in terms of workability and concrete with a higher quantity of wood waste held very well. Lightweight concrete aggregate is around 25 percent lighter in dead load than standard concrete. Given all the physical and mechanical properties, the study finds that wood concrete can be used in the construction of buildings.
    Źródło:
    Archives of Civil Engineering; 2020, 66, 4; 675-688
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The ductile behavior of high performance concrete in compression
    Autorzy:
    Fantilli, A. P.
    Mihashi, H.
    Vallini, P.
    Chiaia, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/231475.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ciągliwość
    ściskanie
    beton wysokowartościowy
    beton samozagęszczalny
    beton normalnie zagęszczony
    ściskanie trójosiowe
    odporność na kruche pękanie
    ductility
    compression
    high performance concrete
    self-compacting concrete
    normal vibrated concrete
    confining pressure
    triaxial test
    fracture toughness
    Opis:
    The ductility of High Performance Concrete (HPC) can develop both in tension and compression. This aspect is evidenced in the present paper by measuring the mechanical response of normal vibrated concrete (NC), self-compacting concrete (SC) and some HPCs cylindrical specimens under uniaxial and triaxial compression. The post-peak behaviour of these specimens is defined by a non-dimensional function that relates the inelastic displacement and the relative stress during softening. As a result, in normal and self-consolidating concrete, fracture toughness in compression increases in the presence of active confinement. Moreover, HPC specimens, which can also show strain hardening in tension, provide a very ductile behaviour even in absence of confinement. In particular, during the post-peak stage, the ductility of HPC is comparable with that of NC or SC at 1 MPa of confining pressure. Moreover, the performance of fiber-reinforced composites can be quantified by the distributed confining pressure generated by the fibers. The presence of HPC in compressed columns is therefore sufficient to create a sort of active distributed confinement, and improve both the mechanical behaviour of concrete and its durability.
    Źródło:
    Archives of Civil Engineering; 2010, 56, 1; 3-18
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimised mix design for normal strength and high performance concrete using particle packing method
    Autorzy:
    Gopinath, S.
    Ramachandra-Murthy, A.
    Ramya, D.
    Iyer, N. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/230735.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    beton zwykły
    beton wysokowartościowy
    metoda ACI
    metoda BIS
    upakowanie ziaren
    upakowanie cząstek
    projektowanie mieszanki
    wytrzymałość na ściskanie
    normal strength concrete
    high performance concrete
    ACI method
    BIS method
    particle packing
    mix design
    compressive strength
    Opis:
    This paper presents the details of optimized mix design for normal strength and high performance concrete using particle packing method. A critical review of mix design methods have been carried out for normal strength concrete using American Concrete Institute (ACI) and Bureau of Indian Standards (BIS) methods highlighting the similarities and differences towards attaining a particular design compressive strength. Mix design for M30 and M40 grades of concrete have been carried out using ACI, BIS and particle packing methods. Optimization of concrete mix has been carried out by means of particle packing method using EMMA software, which employs modified Anderson curve to adjust the main proportions. Compressive strength is evaluated for the adjusted proportions and it is observed that the mixes designed by particle packing method estimates compressive strength closer to design compressive strength. Further, particle packing method has been employed to optimize the ingredients of high performance concrete and experiments have been carried out to check the design adequacy of the desired concrete compressive strength.
    Źródło:
    Archives of Civil Engineering; 2011, 57, 4; 357-371
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical properties and flexural behaviour of reinforced concrete beams containing recycled concrete aggregate
    Autorzy:
    Dawood, Malak H.
    Al-Asadi, Ali K.
    Powiązania:
    https://bibliotekanauki.pl/articles/36054761.pdf
    Data publikacji:
    2022
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    normal aggregate
    NA
    recycled concrete aggregate
    RCA
    reinforced concrete
    RC
    interfacial transition zone
    ITZ
    Opis:
    Increasing waste recycling has become an essential process in the construction industry due to the environmental and economic advantages, such as minimizing waste in landfills, saving natural resources, and decreasing pollution. Crushing and sieving waste from standard compression test cubes is used to produce the recycled concrete aggregate (RCA). A set of standard concrete cylinders, cubes, and beam specimens were made by utilizing coarse aggregate replacement ratios of 0%, 30%, 50% and 70%. At the day 28 stage, the specimens were tested to determine compressive strength, stress–strain relationship, splitting tensile strength, and flexural strength. In addition, four reinforced concrete (RC) beams were cast and tested under a four-point load to evaluate the flexural behaviour of RC beams with partial replacement of the natural aggregate with RCA. One was a natural aggregate (NA) control beam, while the others had varying RCA ratios (30%, 50% and 70%). The results show that the compressive strength of RCA concrete with the replacement by 30%, 50% and 70% decreased by 9.10%, 18.88% and 22.57% respectively, in comparison to the compressive strength of normal concrete (NC). The RCA concrete showed a high strain capacity, which indicated high ductility. The maximum RCA type strains ranged from 0.0056 to 0.0072. Concrete flexural strength showed a slight decrease in comparison to NC (18.83% decrease), where the tensile strength showed a 10.61% decrease in comparison to NC. As for RC beams, the load-carrying capacity decreased by 10.5% with increases in the replacement ratio.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2022, 31, 4; 259-269
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strength of eccentrically tensioned reinforced concrete structures with small eccentricities by normal sections
    Autorzy:
    Dmytrenko, Yevhen
    Yakovenko, Ihor
    Fesenko, Oleg
    Powiązania:
    https://bibliotekanauki.pl/articles/35540855.pdf
    Data publikacji:
    2021
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    reinforced concrete structures
    deformation model
    two-line stress-strain diagram
    non-eccentric tension
    small eccentricities
    normal cross sections
    Opis:
    It is implemented the method of normal rectangular sections slab (shell) reinforced concrete elements strength calculating with flat eccentric tensile strength using the deformation m ethod. The results of the calculation are analyzed for the case of eccentric tension with small eccentricities with varying next parameters: the height of the cross section and the reinforcement coefficient. It is investigated the character of diagrams condition change of section “N - εc(1)” at gradual change of the stress-strain state from eccentric to the central tension. It is revealed that when the eccentricity of external forces decreases, the compressed zone of concrete decreases until its complete disappearance, and at rather small values of eccentricities of force application the balance between external and internal forces cannot be found by the method of current norms. An equilibrium is found between internal and external forces only at a two-digit diagram of the distribution of relative longitudinal deformations (in the case of a compressed zone). Variants of the given problem decision without considerable loss of calculations accuracy are offered, the most expedient of which is transition to algorithm of calculation by a method of limiting efforts. It was accepted as the basic in the previous building norms. The results of numerical calculations performed in the software complex “Lira-CAD” and the corresponding mathematical modeling confirmed the rationality and allowable accuracy of further calculations by this method.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2021, 30, 3; 424-438
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Handling of uncertainties in attributing thermoshock in fibrous concrete strength: a probabilistic approach
    Postępowanie w przypadku niepewności w przypisywaniu szoku termicznego w wytrzymałości betonu włóknistego: podejście probabilistyczne
    Autorzy:
    Elangovan, G
    Rajanandhini, V. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/231435.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    beton włóknisty
    rozkład normalny
    prawdopodobieństwo
    kontrola jakości
    niezawodność
    szok termiczny
    fibrous concrete
    normal distribution
    probability
    quality control
    reliability
    thermoshock
    Opis:
    Hallmark professionalism in probabilistic analysis is to quantify the uncertainties involved in construction materials subject to intrinsic randomness in its physical and mechanical properties and is now gaining popularity in civil engineering arena. As well, knowledge of behaviour of materials is continuously evolving and its statistical descriptors are also changing when more and more data collected or even data updated and hence reliability analysis has to be carried out with the updated data as a continuous process. As per the committee report ACI 544.2R, it is found that there is no attempt made for probabilistic relation between cube compressive strength and cylinder compressive strength for fiber reinforced concrete. In consequence of this report, a robust relation between cube and cylinder of experimentally conducted compressive strength was established by Monte-Carlo simulation technique for different types of fibrous concrete like steel, alkali resistant glass and polyester fibrous concrete before and after thermoshock considering various uncertainties. Nevertheless simulated probabilistic modals, characteristic modals, optimized factor of safety and allowable designed cylinder compressive strength have been developed from the drawn probability of failure graph, which exhibits robust performance in realistic Civil Engineering materials and structures.
    Większość krajów korzysta z sześciennych próbek, a kilka innych używa próbek cylindrycznych w celu ustalenia wytrzymałości na ściskanie betonu. Na ogół wytrzymałość na ściskanie cylindra jest nieuczciwie ustalana jako 0,8 wytrzymałości sześcianu na ściskanie, ale doświadczenia wykazały, że nie ma unikalnego związku między wytrzymałością sześcianu a wytrzymałością cylindra. Podobna sytuacja występuje również w przypadku betonu włóknistego. Zgodnie z raportem komisji Amerykańskiego Instytutu Betonu ACI 544.2R okazuje się, że nie podjęto próby wykazania probabilistycznego związku między wytrzymałością sześcianu na ściskanie a wytrzymałością cylindra w przypadku żelbetu. Obecnie wytrzymałość materiałów konstrukcyjnych jest wymagana, ponieważ gaszenie pożaru wodą prowadzi do szoku termicznego. Przewidywanie wytrzymałości próbki sześciennej lub cylindrycznej przed i po szoku termicznym jest wymagane w przypadku betonu włóknistego różnych typów.
    Źródło:
    Archives of Civil Engineering; 2016, 62, 4/I; 17-33
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibility of pore size distribution application to the description of air-entrained concrete porosity structure
    Możliwość stosowania rozkładu wielkości porów do opisu parametrów struktury porowatości betonów napowietrzonych
    Autorzy:
    Wawrzeńczyk, J.
    Kozak, W.
    Kłak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/402006.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
    Tematy:
    air-entrained concrete
    air pore size distribution
    log-normal distribution
    beton napowietrzony
    rozkład wielkości porów powietrza
    rozkład log-normalny
    Opis:
    Air void size and number distribution constitutes a major characteristic, which substantially contributes to building up concrete resistance to cyclic freezing and thawing. The standard pore spacing factor L is based on the Powers model. Due to the assumptions made in the model, it may not be able to represent the real structure of air pores in the concrete. Consequently, it is necessary to look for other methods to describe this structure. The sought model needs to account for variability in sizes of pore chords and pore random spacing in the paste. The paper analyses the distribution type and compares porosity characteristics obtained with measurements, and on the basis of the distribution. The analysis aims to assess if it is possible to substitute chords in the 0 to 400 μm range with their distribution. Another purpose of the analysis is to compare air pore structure parameters obtained by computations on raw data with the results received on the basis of pore size distribution for a given concrete.
    Źródło:
    Structure and Environment; 2014, 6, 1; 5-12
    2081-1500
    Pojawia się w:
    Structure and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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