摘要
用三点弯曲梁试件测定了钢纤维混凝土的等效断裂韧度KeIC和裂纹口张开位移的临界值CTODc,研究了预疲劳加载幅值对钢纤维混凝土断裂特性的影响规律。试验证明 :当预疲劳加载幅值超过某一阈值后 ,钢纤维混凝土的断裂参数有所降低 ,它们是与预疲劳加载幅值有关的物理量。另外 ,对钢纤维混凝土作了等幅疲劳断裂试验 ,研究了钢纤维混凝土在弯曲疲劳荷载下的不可逆变形发展、疲劳寿命、吸收能量规律及损伤特性 ,研究表明
The influences of preloading range on the fatigue fracture and damage behavior of steel fiber reinforced concrete are studied in the paper A test of three?point beam with notch is used in the study The results show that the fracture parameters are noticeably decreased when the preloading strength is greater than a threshold value;it is dependent on the preloading history Then,fatigue fracture and damage behavior are discussed under the equal range cyclic loading test The energy ratio is proved that it is more reliable to evaluate the damage process than the total strain
出处
《土木工程学报》
EI
CSCD
北大核心
2003年第2期20-25,共6页
China Civil Engineering Journal
基金
高等学校博士学科点专项科研基金
山东省自然科学基金资助课题
关键词
钢纤维混凝土
疲劳
断裂
损伤
试验
fatigue,fracture,damage,steel fiber reinforced concrete
