Experimental and numerical research on the bond‐slip behavior of square‐rebar reinforced concrete during the republic of China (1912–1949). (9th December 2020)

• Record Type: Journal Article
• Authors: Zhang, Chengwen; Chun, Qing; Jin, Hui; Zhang, Shiqi; Lin, Yijie
• Is Part Of: Structural concrete. Volume 22:Number 2(2021)
• Page Start: 871
• Page End: 893
• Publication Date: 2020-12-09
• Subjects: bond‐slip behavior -- Euclidean distance -- finite element -- Mahalanobis distance -- square‐rebar -- UGO method; Reinforced concrete -- Periodicals; 624.1834
• DOI: 10.1002/suco.202000393
• Languages: English
• ISSNs: 1464-4177

Abstract

Abstract: Square‐rebar reinforced concrete structures during the republic of China (ROC) (1912–1949) have special material properties and structural characteristics. To perform nonlinear finite element simulations of this special type of structure more accurately, a specialized bond‐slip constitutive model is built. Eighteen central pullout specimens were designed based on the ROC concrete mix proportions and the square‐rebar. Then, the test data were fitted with the universal global optimization method and the minimum Euclidean distance point method was chosen to calculate the inflection point matrix of the bond‐slip constitutive model. Finally, the main factors influencing the bond‐slip behavior of the ROC square‐rebar reinforced concrete were analyzed. The research results show that the corrosion of the square‐rebar produces a negative effect on the whole structure and a modified bond‐slip regression curve considering the size effect is obtained. The research results can provide a scientific basis for the nonlinear calculation of ROC square‐rebar reinforced concrete structures considering the bond‐slip behaviors. Highlights: The universal global optimization method of bond‐slip was used to fit the test data. The minimum Euclidean distance point method and the minimum Mahalanobis distance point method were used to centralize the fitting inflection points. A modified four‐line bond‐slip constitutive model considering the size effect was proposed for square‐rebar reinforced concrete during the republic of China (1912–1949). Bond‐slip behavior between concrete and rebar was modeled by finite element method.