Seismic behavior of corroded reinforced concrete column joints under low-cyclic repeated loading

• Autorzy: Luo Xiaoyong , Cheng Junfeng , Xiang Ping , Long Hao

Identyfikatory

DOI

10.1007/s43452-020-00043-z

• Języki publikacji: EN

Abstrakty

EN

To investigate the influence of corroded steel bars on seismic performance of reinforced concrete (RC) columns, eight full-scale RC columns were designed and fabricated, which were composed of one uncorroded RC column, three RC columns with longitudinal reinforcement corrosion and four stirrup-corroded RC columns. The electrochemical test was conducted to accelerate the corrosion of steel bars in RC columns, and the low-cyclic repeated loading tests on RC columns with corrosion-damaged steel bars were carried out. The seismic behavior indicators, including the hysteretic curves, skeleton curves, displacement ductility coefficient, stiffness degradation curves and energy dissipation capacity of corroded RC columns and uncorroded columns, were compared and discussed. The experimental results show that with the increase in steel bars corrosion degree, the pinch phenomenon of the hysteretic curve gradually increases, and the energy dissipation capacity, stiffness and plastic deformation capacity of specimen reduce significantly. The ductility and energy dissipation coefficient decreased by 20% and 36%, respectively, when the stirrups corrosion ratio of specimen reaches 15.2%, and a shear failure surface was formed in the plastic hinge zone at the foot of the columns, which leads to the change of failure mode from ductile bending failure to shear failure with poor ductility under the ultimate load for corroded columns. The influence of stirrup corrosion on the failure mode of specimens is remarkable, but the effect of longitudinal reinforcement corrosion is negligible for specimens with the corrosion ratio within 14.7%. The adverse effects caused by over 15.2% stirrup corrosion should be considered in seismic design of structures in seismic zone.

Słowa kluczowe

EN

reinforced concrete column; electrochemical test; corrosion ratio; low-cyclic repeated test; seismic behavior

PL

kolumna żelbetowa; badanie elektrochemiczne; korozja; cykliczność

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2020
• Tom: Vol. 20, no. 2
• Strony: 138--157
• Opis fizyczny: Bibliogr. 42 poz., fot., rys., wykr.

Twórcy

autor

Luo Xiaoyong

• School of Civil Engineering, Central South University, Changsha 410075, Hunan, China
• Prefabricated Construction Engineering and Technological Research Center of Hunan Province, Changsha 410075, China

autor

Cheng Junfeng

• School of Civil Engineering, Central South University, Changsha 410075, Hunan, China

autor

Xiang Ping

• School of Civil Engineering, Central South University, Changsha 410075, Hunan, China
• National Engineering Laboratory for High-Speed Railway Construction, Changsha, China
• Department of Architectural and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR

autor

Long Hao

• School of Civil Engineering, Central South University, Changsha 410075, Hunan, China

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021)