Creep Test and Analysis of Concrete Columns under Corrosion and Load Coupling

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Title: Creep Test and Analysis of Concrete Columns under Corrosion and Load Coupling

Author(s): Guo-Hui Cao, Chuan-Chang Han, Peng Peng, Wang Zhang, and Huan Tang

Publication: Structural Journal

Volume: 116

Issue: 6

Appears on pages(s): 121-130

Keywords: age-adjusted effective modulus; coupling of corrosion and load; creep; prediction model of concrete shrinkage and creep; reinforced concrete column

Date: 11/1/2019

Abstract:
The development patterns of concrete creep under corrosion and load coupling in a solution environment are studied based on experimental research on reinforced concrete columns. The experimental data demonstrate that the creep of columns increases with the corrosion of steel—that is, the restraint of steel on creep is weakened by corrosion. Steel corrosion and loading age influence concrete creep, and the two effects have a superposition effect, which is not only a simple linear superposition. When the reinforcement ratio is low, the creep coefficient of early-age concrete under the action of corrosion and load coupling is lower than that of late-age concrete. This study analyzes the applicability of the commonly used creep model to reinforced concrete under the action of corrosion and load coupling. Results show a significant difference between the predicted value of the current creep model and the measured creep coefficient. Correction coefficient of steel corrosion is introduced based on the age-adjusted effective modulus, the internal force redistribution mechanism, and the current CEB-FIP 90 creep model. Then, the prediction model of concrete shrinkage and creep under the coupling effects of corrosion and load is deduced. The validity and applicability of the concrete creep prediction model are verified by comparing the theoretical and measured values of the concrete creep prediction model.