Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Bond of steel reinforcing bars in self-prestressed hybrid steel fiber reinforced concrete
Reinforcing bar bond is of paramount importance for the structural integrity of reinforced concrete and can be enhanced by fiber inclusion and self-prestressing. Previous research has developed bio-inspired self-prestressed fiber reinforced concrete (SP-FRC) utilizing fibers and expansive agent, and multiscale hybrid steel fiber reinforced concrete (HSFRC). In this research, SP-FRC and HSFRC were combined to develop bio-inspired self-prestressed hybrid steel fiber reinforced concrete (SP-HSFRC) in which the bond of steel reinforcing bars was studied experimentally by pull-out tests. From the bond-slip curves, various bond parameters, namely, bond strength, slip at peak bond stress, initial bond stiffness, and secant bond stiffness, were determined and correlated to a hybrid fiber factor to establish analytical models for design calculations. Then, a new bond model that yields finite initial bond stiffness for more realistic bond-slip analysis than the Model Code 2010 was extended to SP-HSFRC, as evidenced by good agreement between the predicted and experimental bond-slip curves. Lastly, the beneficial effect of the improved bond in crack control of steel bar reinforced HSFRC was rigorously proved.
Bond of steel reinforcing bars in self-prestressed hybrid steel fiber reinforced concrete
Reinforcing bar bond is of paramount importance for the structural integrity of reinforced concrete and can be enhanced by fiber inclusion and self-prestressing. Previous research has developed bio-inspired self-prestressed fiber reinforced concrete (SP-FRC) utilizing fibers and expansive agent, and multiscale hybrid steel fiber reinforced concrete (HSFRC). In this research, SP-FRC and HSFRC were combined to develop bio-inspired self-prestressed hybrid steel fiber reinforced concrete (SP-HSFRC) in which the bond of steel reinforcing bars was studied experimentally by pull-out tests. From the bond-slip curves, various bond parameters, namely, bond strength, slip at peak bond stress, initial bond stiffness, and secant bond stiffness, were determined and correlated to a hybrid fiber factor to establish analytical models for design calculations. Then, a new bond model that yields finite initial bond stiffness for more realistic bond-slip analysis than the Model Code 2010 was extended to SP-HSFRC, as evidenced by good agreement between the predicted and experimental bond-slip curves. Lastly, the beneficial effect of the improved bond in crack control of steel bar reinforced HSFRC was rigorously proved.
Bond of steel reinforcing bars in self-prestressed hybrid steel fiber reinforced concrete
Chu, S.h. (Autor:in) / Unluer, C. (Autor:in) / Yoo, D.y. (Autor:in) / Sneed, L. (Autor:in) / Kwan, A.k.h. (Autor:in)
15.09.2023
Chu , S H , Unluer , C , Yoo , D Y , Sneed , L & Kwan , A K H 2023 , ' Bond of steel reinforcing bars in self-prestressed hybrid steel fiber reinforced concrete ' , Engineering Structures , vol. 291 , pp. 116390 . https://doi.org/10.1016/j.engstruct.2023.116390
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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