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Wyszukujesz frazę "hollow" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Shear stresses of hollow lightweight concrete beams made with wood waste
Autorzy:
Alharishawi, Salam Salman Chiad
Rajaa, Nagham
Shihab, Lina Abdulsalam
Powiązania:
https://bibliotekanauki.pl/articles/1853649.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
beton lekki zbrojony
belka z otworami
zachowanie przy zginaniu
naprężenie ścinające
pęknięcie
beton lekki z otworami
beton lekki lity
trociny
reinforced lightweight concrete
hollow beam
flexural behavior
shear stress
crack
hollow lightweight concrete
solid lightweight concrete
wood waste
Opis:
Hollow Lightweight Concrete (HLC) beams are gaining popularity due to low cost and low weight as compared with the Solid Lightweight Concrete (SLC) beams. HLC and SLC beams decrease in weight, without losing strength and durability. Flexural and shear behavior of reinforced HLC and SLC beams made with sawdust under two-point load is investigated in this study. The ultimate deformation efficiency and shear resistant mechanism of HLC beams are discussed experimentally and compared with other SLC beams. The beams, tested in this research, are rectangular. Beams were designed and constructed as 12 * 23 * 100 cm. Six concrete beam models were prepared including three SLC beams without the hollow and the other three HLC beams poured hollow 50 * 7.5 cm throughout the all beam of 100 cm. All beams were split according to the distance between vertical stirrups, these stirrups were divided into three specimens 45, 13, and 6 cm. By analyzing six experimental test beams, in this research, investigated the effect of diverse factors on the shear of beams. On comparison with normal concrete beams, this work describes the failure of mechanism, process, and ductility. The first crack loads, ultimate loads, load-deflection behavior, crack patterns and shapes of failure were investigated in this study. The experimental results show the ultimate performance of HLC beams are pure shear and controlled by yielding tension and compression steel bars. Also, it is found that the measured size and configuration of the hollow opening had an effect on the load-carry capacity and mid-span deflection of HLC beams. Thus, the design and construction details of beams can be additionally customized to reduce the total cost and weight of the HLC beams.
Źródło:
Archives of Civil Engineering; 2021, 67, 1; 657-672
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of hollow section overlap joints with the reinforcing rib plate. Welded connection resistance
Autorzy:
Bródka, J.
Broniewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/230408.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
konstrukcja stalowa
kształtownik zamknięty
połączenie nakładkowe
połączenie wzmocnione
odporność spoiny
steel structures
hollow section
overlap joint
reinforced joint
weld resistance
Opis:
In calculating the resistance of welds within the connections between hollow sections in EN 1993-1-8, very general information is given without presenting specific calculations. The chief recommendations indicate that the resistance of the welds connecting the wall to the second element should not be less than the resistance of the cross section of the wall. In addition, assessment of the welds’ resistance based on the effective lengths is viable in cases when forces in the braces are smaller than the resistance of the joint, though the detailed method was not specified. The objective of this paper is to present the most up-to-date information about the design of overlap welded joints with a reinforcing rib plate.
Źródło:
Archives of Civil Engineering; 2015, 61, 1; 17-44
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of hollow section overlap joints with reinforcing rib plate. Joint resistance
Autorzy:
Bródka, J.
Powiązania:
https://bibliotekanauki.pl/articles/230435.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
konstrukcja stalowa
kształtownik zamknięty
żebro wzmacniające
odporność
ocena
połączenie nakładkowe
steel structure
hollow section
reinforcing rib
resistance
assessment
overlap joint
Opis:
These joints are used when the designer and contractor anticipate difficulties during the construction of overlap joints. They were not included in the PN EN 1993-1-8 in full scale. Resistance assessment of such joints is presented in accordance with standard rules. The results were compared with the experimental studies carried out at the “Mostostal” Centre; while the former research activities and the legitimacy of the proposed method of assessing the resistance of these joints was confirmed. This is an example of an overlap joint calculation.
Źródło:
Archives of Civil Engineering; 2015, 61, 1; 3-16
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the deflection and crack layout in a hollow slab bridge
Autorzy:
Wang, Songtao
Wang, Dawei
Powiązania:
https://bibliotekanauki.pl/articles/27312170.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
inżynieria mostowa
belka mostowa
belka pusta
poślizg wiązania
rozstaw pęknięć
naprężenie zbrojenia
ugięcie
bridge engineering
hollow beam
slab beam
bond-slip
crack spacing
reinforcement stress
deflection
Opis:
This paper conducts research based on the hollow slab members in the reconstruction and expansion project of expressways, two types of numerical finite element models with and without considering bond-slip relationship of reinforcement and concrete are established, and verified by tests. The distribution characteristics of crack spacing in reinforced concrete beams are studied. The results show that the bond-slip characteristics of reinforced concrete have little effect on the load-deflection characteristics of 8m hollow slab beam. Due to the influence of the bond-slip relationship of reinforced concrete, the load-deflection curve is partially serrated, while without considering the bond-slip relationship of reinforced concrete, the load-deflection curve is smooth. In the numerical model without considering the bond-slip characteristics, almost all damage occurs in the longitudinal direction, and the distribution characteristics of cracks can’t be accurately determined. Regardless of whether the bond-slip is considered or not, the macroscopic characteristics of the stress distribution is: smaller near the support and larger at the mid-span. As secondary flexural cracks expand, models with and without consideration of bond-slip characteristics can’t calculate crack spacing based on the stress distribution characteristics of the reinforcement.
Źródło:
Archives of Civil Engineering; 2023, 69, 3; 541--555
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of welding trusses overlap joints made of rectangular hollow sections
Autorzy:
Bródka, J.
Broniewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/230155.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
połączenie nakładkowe
połączenie kratownicowe
element z otworami
element mocujący RHS
cięciwa RHS
odporność spoiny
partially overlapped joint
trusses joint
hollow section
RHS brace member
RHS chord
resistance of the weld
Opis:
The basis for calculating of resistance of welded RHS connections is provided by codes and international guidebooks. In the matter of calculation of the resistance of welded joints, the European standard contains very general recommendations without specifying the detailed calculation procedures, which (the) designers could use in their work. Estimation of resistance of welded semi-rigid joints is a complex issue because it requires determining of effective lengths of welds, their placement on the member walls with their different rigidity, and distribution of components of the load acting on each section of welds in various joint areas. In this paper an approximate assessment is suggested of the resistance of the welded connection in the overlapped K type joints, made of rectangular hollow sections.
Źródło:
Archives of Civil Engineering; 2013, 59, 4; 441-468
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropy of soil shear strength parameters caused by the principal stress rotation
Anizotropia parametrów wytrzymałościowych w gruntach spowodowana obrotem kierunków naprężeń głównych
Autorzy:
Wrzesiński, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1853642.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
grunt
wytrzymałość na ścinanie bez odpływu
spójność
kąt tarcia wewnętrznego
obrót kierunków naprężeń głównych
badanie geotechniczne
aparat cylindryczny skrętny
aparat trójosiowy
soil
undrained shear strength
cohesion
internal friction angle
principal stress rotation
torsional shear
hollow cylinder test
triaxial test
Opis:
The paper presents the phenomenon of principal stress rotation in cohesive subsoil resulting from its loading or unloading and the impact of this phenomenon on the values of soil shear strength parameters: undrained shear strength τfu, effective cohesion c’, effective angle of internal friction φ’. For this purpose, tests in a triaxial apparatus and torsional shear hollow cylinder apparatus on selected undisturbed cohesive soils: sasiCl, saclSi, clSi, Cl, characterized by different index properties were carried out. Soil shear strength parameters were determined at angle of principal stress rotation α equal to 0° and 90° in tests in triaxial apparatus and α equal to 0°, 15°, 30°, 45°, 60°, 75°, 90° in tests in torsional shear hollow cylinder apparatus. The results of laboratory tests allow to assess the influence of the principal stress rotation on the shear strength parameters that should be used to determine the bearing capacity of the subsoil.
W artykule przedstawiono wpływ obrotu kierunków naprężeń głównych na wartości parametrów wytrzymałościowych gruntów spoistych: wytrzymałość na ścinanie bez odpływu τfu, efektywną spójność c', efektywny kąt tarcia wewnętrznego φ’. W tym celu przeprowadzono badania w aparacie trójosiowym i w cylindrycznym aparacie skrętnym na wybranych gruntach spoistych o nienaruszonej strukturze: sasiCl, saclSi, clSi, Cl o różnych wartościach parametrów fizycznych. Badano grunty o współczynniku prekonsolidacji OCR w zakresie od 1.1 do 5.7, wskaźniku plastyczności Ip w zakresie od 10.0% do 83.8% oraz wskaźniku konsystencji Ic w zakresie od 0.14 do 1.16. Parametry wytrzymałościowe gruntów określono przy kątach obrotu kierunków naprężeń głównych α równych 0° i 90° w badaniach w aparacie trójosiowym i kątach α równych 0°, 15°, 30°, 45°, 60°, 75°, 90° w badaniach w cylindrycznym aparacie skrętnym. Wyniki badań laboratoryjnych pozwoliły ocenić wpływ obrotu kierunków naprężeń głównych na parametry wytrzymałościowe gruntów spoistych niezbędnych przy wyznaczaniu nośności podłoża.
Źródło:
Archives of Civil Engineering; 2021, 67, 1; 163-187
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bond strength of concrete-filled hollow section with modified fibrous foamed concrete
Autorzy:
Khairuddin, S. A. A.
Rahman, N. A.
Jamaluddin, N.
Jaini, Z. M.
Elamin, A.
Rum, R. H. M.
Powiązania:
https://bibliotekanauki.pl/articles/230151.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
siła wiązania
pusta sekcja wypełniona betonem
CFHS
beton modyfikowany
beton włóknisty
beton spieniony
popiół z łusek ryżowych
RHA
wytrzymałość
metoda push-out
bond strength
concrete filled hollow section
modified fibrous foamed concrete
rice husk ash
strength
push-out method
Opis:
The concrete-filled section of columns has been widely in construction used due to its structural elements. As a result, the usage of composite columns has recently increased all over the world. However, using foamed concrete alone does not result in much improvements in strength. Therefore, this paper examines the use of foamed concrete containing fibre to improve the strength of composite columns. Specifically, this study aims to determine the bond strength of concrete-filled hollow section (CFHS) with modified fibrous foamed concrete. Two types of fibre are used in this work, namely, steel fibre and polypropylene fibre, with rice husk ash (RHA) as a sand replacement to improve the compressive strength of foamed concrete. The CFHS with modified fibrous foamed concrete is tested by using the push-out method, and the results show that CFHS with steel fibre has a highest bond strength.
Źródło:
Archives of Civil Engineering; 2020, 66, 3; 97-108
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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