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(1 同濟(jì)大學(xué)建筑工程系  上海 200092;2 山東大學(xué)土建與水利學(xué)院  濟(jì)南 250061)
【提要】  通過混凝土梁的低周疲勞破壞試驗(yàn)，引入動(dòng)態(tài)模量和損傷變量的概念，研究了混凝土梁由于疲勞累積損傷而造成的剛度衰減規(guī)律。建立了疲勞壽命與動(dòng)態(tài)模量之間關(guān)系的數(shù)學(xué)模型，提出了通過較少循環(huán)的試驗(yàn)結(jié)果來預(yù)測混凝土梁疲勞壽命的方法。該方法也可以用于受交變荷載作用的已建混凝土結(jié)構(gòu)在使用荷載發(fā)生變異情況下的可靠性評(píng)估。
【關(guān)鍵詞】  混凝土梁  動(dòng)態(tài)模量  損傷變量  疲勞壽命預(yù)測  試驗(yàn)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