Bond behavior of corroded reinforcements in concrete: an experimental study and hysteresis model

• Autorzy: Zhang Yi‑Bo , Zheng Shan-Suo , Dong Li-Guo , Zheng Yue

Identyfikatory

DOI

10.1007/s43452-022-00600-8

• Języki publikacji: EN

Abstrakty

EN

In order to study the effect of both longitudinal reinforcement and stirrups corrosion on the bond performances at steel-concrete interface under reversed cyclic loading, in this paper, the eccentric pull-out tests under reversed cyclic loading were carried out on reinforced concrete (RC) specimens with five corrosion degrees, three concrete cover thicknesses, and three stirrup spacings. The influence of the corrosion rate of longitudinal reinforcement, corrosion rate of stirrups, cover thickness, and stirrup spacing on bond performance indicators was examined, including the initial bond stiffness, peak bond stress, slip at peak bond stress, bond strength at unloading, unloading stiffness, frictional bond resistance, and cumulative energy dissipation. Moreover, the effects of coupling corrosion on cover cracking morphology and bond degradation mechanism were also analyzed. Results indicated that after severe corrosion of longitudinal reinforcement and stirrups, the cover appears cracking or local spalling, and the bond performances are signifcantly reduced. It was also showed that thickening cover or densifying stirrups could improve the interface bond performance and energy dissipation capacity. Each hysteresis parameter degrades apparently under the controlling slip corresponding to the peak bond stress. Subsequently, based on the analysis results and previous studies, empirical local bond stress-slip hysteresis models for corroded longitudinal reinforcement and corroded stirrup under reversed cyclic loading were proposed. Good consistency was observed for the hysteresis model with existing experimental data.

Słowa kluczowe

EN

reinforced concrete; reversed cyclic loading; bond performance; hysteresis model

PL

beton wzmocniony; obciążenie cykliczne; model histerezy

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2023
• Tom: Vol. 23, no. 2
• Strony: ar. no. e95, 2023
• Opis fizyczny: Bibliogr. 37 poz., rys., tab., wykr.

Twórcy

autor

Zhang Yi‑Bo

• School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
• Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education (XAUAT), Xi’an 710055, China

autor

Zheng Shan-Suo

• School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
• Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education (XAUAT), Xi’an 710055, China

autor

Dong Li-Guo

• School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
• Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education (XAUAT), Xi’an 710055, China

autor

Zheng Yue

• College of Civil Engineering and Architecture, Hebei University, Baoding 071002, China

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).