摘要
腐蚀疲劳是钢筋混凝土结构破坏的主要因素之一。基于剪切筒模型及文中选用的实验加载方式,考虑界面摩擦系数的衰减,同时考虑力学因素—应力比R和加载频率f的影响,研究了钢筋与混凝土界面腐蚀疲劳裂纹扩展情况。通过对Paris公式的修正,借助能量耗散率给出腐蚀疲劳数学模型,得到了界面腐蚀疲劳脱粘速率,脱粘长度与循环荷载作用次数的关系。同时考虑混凝土损伤(如刚度衰减)的影响,分析了影响界面腐蚀疲劳(CF)裂纹扩展速率的因素,如应力比,加载频率。
CF（Corrosion fatigue） is one of major factors for reinforced concrete damage.Based on a shear-lag model and experimental loading mode,interfacial crack propagation under CF is investigated,in which frictional coefficient degradation,stress ratio and loading frequency are considered.By modifying Paris formula,the CF model is given,and relationship among debond rate,debond length and cyclic number is obtained.Also,considering concrete damage,factors influencing interfacial crack propagation of CF are analyzed,which are the stress ratio and the loading frequency.
出处
《世界地震工程》
CSCD
北大核心
2008年第1期110-115,共6页
World Earthquake Engineering
关键词
钢筋混凝土
界面脱粘
腐蚀疲劳
数值模拟
reinforced conctrete
interfacial debonding
CF
numerical simulation
