摘要
通过钢筋混凝土梁在空气环境、杂散电流环境、氯盐环境和两者耦合环境下的疲劳试验,研究了这4种环境下梁的变形发展过程、刚度损伤过程和电化学腐蚀参数。结果表明,在不同腐蚀疲劳环境作用下,梁挠度-循环比和刚度损伤变量曲线呈三阶段特征,但其变化程度有所不同,空气环境最慢,氯盐环境到疲劳后期较快,杂散电流环境较快,耦合作用下最快。说明空气和氯盐环境下刚度损伤较慢,杂散电流环境下较快,耦合作用下最快。试验同时还表明,耦合作用下腐蚀电位增长最大,杂散电流次之,氯盐中最慢。
The fatigue experiments of reinforcement concrete beams under atmospheric environment, stray current environment, salt solution environment and environment of coupling effect were carried out. Developmental process of deformation, damage process of stiffness and electrochemical corrosion parameters were studied. The test results show that under different environment of corrosion fatigue, the beams present three stage characteristics for the curve of deflectioncycle ratio and damage variable of stiffness, but the change degrees of deflection were different, the slowest under atmos- pheric environment, faster in the later period of salt solution environment, fastest under environment of coupling effect. It indicates that the stiffness faster under stray current environment and the damage of beams are slow under atmospheric environment and salt solution environment, faster under stray current environment and the fastest under environment of coupling effect. The test also indicates that the increase of corrosive potential are the maximum under environment of coupling effect, minor under stray current environment, the minimum under salt solution environment.
出处
《高速铁路技术》
2012年第2期25-29,共5页
High Speed Railway Technology
关键词
钢筋混凝土梁
疲劳损伤
杂散电流
氯离子
疲劳刚度
腐蚀电位
reinforced concrete beam
fatigue damage
stray current
chloride ion
fatigue stiffness
corrosive potential
