摘要
HRBF500钢筋是我国冶金行业新研发的超细晶粒高强钢筋。基于配有HRBF500钢筋混凝土梁疲劳试验结果,采用数值模拟计算方法,对其矩形和T形截面混凝土梁的疲劳寿命、疲劳损伤机理进行分析和研究。提出用剩余抗弯刚度来定义其疲劳损伤变量,建立了HRBF500钢筋混凝土梁疲劳损伤演化模型,根据试验结果分析出,HRBF500钢筋混凝土梁的疲劳损伤增长率均随受拉钢筋初始应力的增加而减少,并推出了模型相关系数(疲劳损伤增长率)表达式。结果表明,该模型能够很好模拟HRBF500钢筋混凝土梁的第一和第二阶段的疲劳损伤过程,且根据该模型可以实现对剩余疲劳寿命的预测。
HRBF500 rebar is a successfully developed new-type high-strength steel bar in Chinese metallurgical industry. Based on the fatigue life numerical simulation and test results, fatigue damage mechanism of rectangular and T-section RC beams with HRBF500 steel bars was analyzed and investigated. The fatigue damage was defined by using the residual bending rigidity of the beams and the accumulative fatigue damage model was obtained. According to the test resuhs, it can be seen that the growth rates of fatigue damage reduced with increase of the initial stress of the tensile reinforcements, and the expressions for correlation coefficients （the growth rate of fatigue damage） of the model was introduced. The results indicate that, the proposed accumulative fatigue damage model can accurately describe the first and second stages of fatigue damage process of RC beams with HRBF500 bars. The remaining fatigue life can be predicted by the model.
出处
《工业建筑》
CSCD
北大核心
2013年第11期45-48,共4页
Industrial Construction
基金
国家863支撑项目资助(2008AA030704)
