Abstract：In order to effectively predict the deterioration rule of the flexural behavior of the corroded reinforced concrete beams (RC beams), the flexural behavior study on three groups of RC beams was conducted based on accelerated corrosion method. The influence of different longitudinal reinforcement corrosion rates on the failure mode, strain distribution and load deflection curve of RC beams was discussed. Based on the applicability evaluation of the existing theoretical models, combined with the time-varying material analysis model, an analysis method for the degradation rule of flexural bearing capacity of RC beams was proposed. The results show that with the increase of corrosion degree of longitudinal bars, the plastic deformation characteristics of RC beams continuously decrease, and the failure mode changes from pure plastic bending to brittle shear bending. As the neutral axis of the mid-span section moves upward, the assumption of plane section cannot be satisfied gradually. Moreover, the flexural bearing capacity of the beam decreases continuously, and the bearing platform of load-deflection curve gradually becomes shorter until it disappears. According to the applicability analysis of the existing bending capacity models, it is found that the calculation accuracy of Sun Bin model is the highest and the discreteness is the least. The deterioration analytical method of flexural behavior of RC beams based on the Sun Bin model can obtain the deterioration curves which are in good agreement with the experimental results.
孙马，周建庭，徐略勤，高鹏，阳珊清. 基于加速锈蚀试验的RC梁抗弯性能劣化研究[J]. 重庆交通大学学报（自然科学版）, 2020, 39(08): 51-58.
SUN Ma, ZHOU Jianting, XU Lueqin, GAO Peng, YANG Shanqing. Deterioration of the Flexural Behavior of RC Beams Based on
Accelerated Corrosion Experiments. Journal of Chongqing Jiaotong University(Natural Science), 2020, 39(08): 51-58.