【摘要】 车载循环作用下的混凝土疲劳强度问题越来越受到人们的重视,而针对混凝土高频疲劳性能的研究不是很多,将高频疲劳试验方法引入到岩石类非金属材料的试验中,针对混凝土圆柱试件进行高频疲劳加速寿命试验研究,通过分析疲劳频率变化曲线的规律,解释混凝土高频疲劳的破坏机理,建立混凝土的轴向压缩非线性疲劳损伤累积模型。同时考虑到存活率,得出混凝土疲劳加速寿命失效概率的P-lgS-lgN双对数疲劳方程。更多还原

【Abstract】 Fatigue strength of highway- and railway- bridges under repeated cyclic loads of vehicles is receiving great concerns from engineers and researchers.However few researches are carried out on high fatigue behavior of concrete.Based on the basic principle of the strength theory of rock and the theory of vibration,a method of high vibration testing is applied to non-metallic fatigue damage mechanics such as rock or concrete.In this paper,plain concrete cylinder specimens were tested under high frequency fatigue loads with constant amplitude.The destructive mechanism of concrete is explained by analyzing the rule of frequency variation curve,and a model for nonlinear fatigue damage accumulation under axial compressive loads is established.By taking survival rate and failure probability into account,a fatigue equation is proposed in a double logarithm form.更多还原