(1 同济大学建筑工程系  上海 200092;2 山东大学土建与水利学院  济南 250061)
【提要】  通过混凝土梁的低周疲劳破坏试验，引入动态模量和损伤变量的概念，研究了混凝土梁由于疲劳累积损伤而造成的刚度衰减规律。建立了疲劳寿命与动态模量之间关系的数学模型，提出了通过较少循环的试验结果来预测混凝土梁疲劳寿命的方法。该方法也可以用于受交变荷载作用的已建混凝土结构在使用荷载发生变异情况下的可靠性评估。
【关键词】  混凝土梁  动态模量  损伤变量  疲劳寿命预测  试验研究
Experimental Study on Fatigue Life Forecasting of RC Beams Using Stiffness Deterioration Parameters/Li Shibin1,Zhu Cimian1,Tang Hongwei2(1 Department of Building Engineering,Tongji University,Shanghai 200092,China; 2 School of Civil Engineering,Shandong University,Jinan 250061,China)
Abstract:Three concrete beams are tested under low cycle fatigue loads.The concepts of dynamic module and damage variable are introduced to the decrease rule of stiffness caused by the fatigue cumulative of concrete beams.The mathematical relationship model of fatigue life and dynamic module is set up,and the predict method of fatigue life of concrete beam is suggested based on the test results of fewer reversion loads.The proposed method can also be used to evaluate the reliability of the RC structures under varied fatigue loads.
Keywords:RC beam；dynamic module;damage variable;fatigue life forecasting;experimental study