局部高密度钢纤维混凝土弯曲疲劳性能研究

STUDY ON FLEXURAL FATIGUE PROPERTY OF PARTIAL HIGH PERCENTAGE FIBER REINFORCED CONCRETE

对局部高密度钢纤维混凝土的弯曲疲劳性能进行了研究。对于高低应力比R不同情况下疲劳寿命的统计问题提出了自己的处理意见。经过统计分析计算 ,确定PHPFRC的等效疲劳寿命符合两参数威布尔分布 ,建立了考虑存活率P lgS lgN双对数疲劳方程。对PHPFRC在循环荷载作用下的变形过程曲线与普通混凝土及SFRC比较其共性及特点进行了分析 ,认为由于PHPFRC在开裂后可以继续长时间承受循环荷载 。

HT5SS]In this paper, the flexural fatigue property of partial high percentage fiber reinforced concrete (PHPFRC) is studied A suggestion of the statistics of fatigue life with different ratio of higher stress to lower stress R is proposed in the paper It is found that the equivalent fatigue life is suited to the Weibull distribution with twoparameter Then, a fatigue equation in double logarithm form is established Meanwhile, the comparisons among the plain concrete, SFRC and PHPFRC are carried out. It is found that the deformation behaviors of plain concrete, SFRC and PHPFRC under cyclic olading are much different. A conclusion is given that PHPFRC has a very good anti?fatigue property due to its long post?crack fatigue life.