论文部分内容阅读
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 steel is a newly developed ultra-fine grain high strength steel in China’s metallurgical industry. Based on the fatigue test results of HRBF500 reinforced concrete beam, the fatigue life and fatigue damage mechanism of the rectangular and T-shaped concrete beams are analyzed and studied by numerical simulation method. Based on the experimental results, the fatigue damage growth rate of HRBF500 reinforced concrete beam is reduced with the increase of the initial stress of the tensioned steel bar , And introduced the model correlation coefficient (fatigue damage growth rate) expression. The results show that the model can well simulate the fatigue damage process of the first and second stages of the HRBF500 reinforced concrete beam, and the prediction of the residual fatigue life can be achieved according to the model.