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Wyświetlanie 1-3 z 3
Tytuł:
Study on sling replacement of concrete-filled steel tube arch bridge
Autorzy:
Zhang, Kexin
Qi, Tianyu
Xue, Xingwei
Li, Yafeng
Zhu, Zhimin
Powiązania:
https://bibliotekanauki.pl/articles/1852540.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rura stalowa wypełniona betonem
most łukowy
podwieszenie
obliczenia symulacyjne
monitorowanie
concrete-filled steel tube
arch bridge
sling
simulating computation
monitoring
Opis:
Concrete-filled steel tube arch bridge is filled with concrete inside the steel tube. The radial constraint of the steel tube limits the expansion of the compression concrete, which makes the concrete in the three-way compression state, thus significantly improving the compressive strength of the concrete. At the same time, it can simplify the construction process and shorten the construction period. Since the rapid development of concretefilled steel tubular tied arch bridge in the 1990s, a large number of such Bridges have suffered from the defects of steel concrete, loose tie rod, and hanger rod rust, etc. Therefore, the reinforcement technology for various diseases has been studied, among which the reinforcement technology for hanger rod replacement is the most complicated and more difficult. As more and more bridges of this type enter the period of reinforcement, it is more and more urgent to study the reinforcement technology of suspenders. Taking a bridge that has been in service for 23 years as an example, this paper discusses the construction method and construction monitoring of replacing the suspender, so as to guide the construction monitoring of the bridge. Finally, the construction monitoring results of the bridge are given, which can provide reference for the replacement of the suspender of this type of bridge.
Źródło:
Archives of Civil Engineering; 2021, 67, 2; 597-610
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical properties of CFST short columns with different void ratios
Autorzy:
Song, Junxi
Han, Zhuowei
Wang, Dawei
Lu, Xiaorui
Powiązania:
https://bibliotekanauki.pl/articles/27312159.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
rura stalowa wypełniona betonem
ściskanie mimośrodowe
analiza elementów skończonych
zachowanie mechaniczne
stosunek
pustka powietrzna
concrete-filled steel tube
eccentric compression
finite element analysis
mechanical behavior
void ratio
Opis:
In order to study the mechanical behavior of concrete-filled steel tube(CFST) short column with different void ratios under a certain eccentricity. A fiber model of concrete-filled steel tube section with different void heights was established. Compared with existing model test data, the axial force and flexural moment strength models of concrete-filled steel tube columns with different void ratios were established. The results show that, in the case of different void ratios, the cross-section strength envelope shows an overall contraction tendency with the increase of void ratio, and each line is basically parallel. A model for calculating the coefficient of axial load degradation was established. The Han’s flexural moment strength model of the flexural component was revised, and the strength model of concrete-filled steel tube column under eccentric compression considering void ratio was established, which provides a theoretical basis and method for the safety assessment during the operation of concrete-filled steel tube arch bridges.
Źródło:
Archives of Civil Engineering; 2023, 69, 3; 587--596
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental behaviour of concrete-filled steel tube composite beams
Autorzy:
Farhan, Khawla A.
Shallal, Muhaned A.
Powiązania:
https://bibliotekanauki.pl/articles/230319.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rura stalowa wypełniona betonem
CFST
beton lekki
belka kompozytowa
ścinanie perfobond-żebro
złącze
beton zbrojony
wytrzymałość na ściskanie
pęknięcie
concrete filled steel tube
lightweight concrete
composite beam
perfobond-rib shear
connector
reinforced concrete
compressive strength
crack
Opis:
The main objective of this study is to highlight the performance of beams composed of lightweight concrete-filled steel tubes (square and circle sections) composite with reinforced concrete deck slab. A total of nine composite beams were tested included two circular and seven square concrete-filled steel tubes. Among the nine composite beams, one beam, S20-0-2000, was prepared without a deck slab to act as a reference specimen. The chief parameters investigated were the length of the specimen, the compressive strength of the concrete slab, and the effect of the steel tube section type. All beams were tested using the three-point bending test with a concentrated central point load and simple supports. The test results showed that the first crack in the concrete deck slab was recorded at load levels ranging from 50.9% to 77.2% of the ultimate load for composite beams with square steel tubes. The ultimate load increased with increasing the compressive strength of the concrete slab. Shorter specimens were more stiffness than the other specimens but were less ductile. The slip values were equal to zero until the loads reached their final stages, while the specimen S20-55-1100 (short specimen) exhibited zero slip at all stages of the load. The ultimate load of the hollow steel tube composite beam was 13.2% lower than that of the reference beam. Moreover, the ductility and stiffness of the beam were also higher for beams with composite-filled steel tubes.
Źródło:
Archives of Civil Engineering; 2020, 66, 2; 235-251
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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