加载速率对锈蚀钢筋与混凝土粘结性能的影响

Loading Velocity Effects on Bond Performance between Corroded Bar and Concrete

进行了加载速率对锈蚀钢筋与混凝土粘结强度影响的研究分析 .试验研究表明高速率加载作用下 ,构件承载力、破坏形式、粘结应力分布都与静力加载作用下的结果有明显不同 .较高的锈蚀率使粘结强度下降 ;较高的加载速率使粘结强度提高 ,且试验研究表明锈蚀率影响与加载速率影响互不相关 .此外结合试验结果和粘结区域破坏过程是马尔柯夫过程的假定 ,给出了综合考虑锈蚀率、加载速率对粘结强度影响的拟合公式 .

The emphasis is placed upon the influence of loading velocity on the bond performance between corroded bar and concrete in this paper.The research shows there are obvious differences about load bearing capacity,damage shape,bond stress distribution,compared with those in stationary conditions,when loading with high velocity.The higher corrosion debases the bond performance while the higher loading velocity increases it and the test demonstrates the irrelevance between corrosion effects and loading rate effects.Based on the test results and the presumption that the damage process of bond zone is Markov process,the bond strength polyfit formula taking into account of the effects of corrosion and loading velocity is proposed.