应力比对钢纤维高强混凝土梁疲劳寿命影响的试验研究  

Experimental Study of Stress Ratio to Fatigue Life of Steel Fiber Reinforced High-Strength Concrete Beams

作　　者：李书群 姬宏奎 杨松 

机构地区：[1]河北省水利水电第二勘测设计研究院,河北石家庄050021

出　　处：《水利与建筑工程学报》2016年第4期157-160,167,共5页Journal of Water Resources and Architectural Engineering

摘　　要：通过对钢纤维钢筋高强混凝土梁不同应力比的弯曲疲劳荷载试验,研究了试件的疲劳寿命及疲劳强度。根据不同应力比作用下梁试件的疲劳寿命N,得出本次试件梁的S-N曲线,裂缝开展规律。应用Miner理论和科尔顿-多兰(Corten-Dolan)公式进行疲劳损伤计算、疲劳寿命分析及预测,最后采用断裂力学理论分析裂缝开展规律以预测疲劳寿命,并提出裂缝开展宽度计算公式。Through the fatigue tests of steel fiber reinforced high strength concrete beams,the impacts to the fatigue strength and fatigue life caused by the stress ratio was analized. Based on the fatigue life N under different stress ratios,this paper acquired the S- N curve of the beams. Miner theory and Colton- Dolan formula were used for fatigue damage calculation,fatigue life analysis and prediction. Additionally the crack expanding law was carried out by the theory of fracture mechanics in order to predict the fatigue life and propose the crack width calculation formula.

关 键 词：应力比 疲劳寿命 Miner理论 S-N曲线 钢纤维 高强混凝土 

分 类 号：TU375.1[建筑科学—结构工程]