Shear Behavior Evaluation of Corroded RC Beams and Seismic Behavior of RC Beams with Corroded Longitudinal Steel Reinforcement

• Main Authors: Yi-shan Cho, 卓奕杉
• Other Authors: Yu-Chen Ou
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/fterwc

碩士 === 國立臺灣科技大學 === 營建工程系 === 100 === The seismic performance of reinforced concrete beams with corrosion of transverse or longitudinal steel reinforcement was examined using cyclic loading in this research. Twelve beams were constructed. Two beams were used as control without corrosion. By using an electrochemical method in the potential plastic hinge region of the beams, six beams were subjected to six different levels of corrosion only in the transverse reinforcement while four beams subjected to four different levels of corrosion only in the longitudinal reinforcement. Each corroded beam was accompanied by a specimen for corrosion observation. The specimen for corrosion observation was intended to simulate the corrosion condition of the beam. After the corrosion process, the beam was tested using cyclic loading to examine the seismic performance. The specimen for corrosion observation was demolished to investigate the corrosion condition of steel reinforcement. Cyclic test results showed that corrosion of transverse reinforcement had a substantial detrimental effect on the deformation capacity of the beam but did not have a significant influence on the load-carrying capacity of the beam. Methods to estimate the residual shear strength and ductility of reinforced concrete beams with corroded transverse reinforcement are proposed. Shear strength estimation based on average weight loss and minimum residual cross sectional area produced results that more reasonably described the experimental behavior. Corrosion of longitudinal reinforcement significantly decreased the load-carrying capacity. In the low and moderate corrosion levels, corrosion of longitudinal reinforcement had little influence on the deformation capacity. However, in the high corrosion level, the deformation capacity was reduced significantly due to premature fracture of longitudinal reinforcement due to stress concentration at the locations of pitting corrosion