摘要
采用我国水工混凝土断裂试验规程推荐的双K断裂模型,确定C25、C35在缝高比0.2～0.5范围内的断裂参数,研究了两种强度等级下缝高比对混凝土断裂特性的影响。试验结果表明,试件的荷载值随着缝高比的增加而逐渐降低;缝高比为0.3或0.4的三点弯曲梁混凝土试件相对韧度较好;缝高比从0.2变化到0.5的范围内,混凝土试件起裂韧度值、失稳韧度值变化不大,起裂韧度和失稳韧度均可认为是一个常数;强度等级越高,断裂能越大,且断裂能随缝高比的变化而变化,缝高比为0.3或0.4时,混凝土试件的断裂能最大。
Double-K fracture model which is recommend by Norm for fracture test of hydraulic concrete of China was used for determining the fracture parameters of concrete specimens（C25, C35）, when the initial crack-depth ratios ranging from 0.2 to 0.5 and the influence of different crack depth ratios on fracture features for two strength grade concrete was studied. The results show that the initial load and the maximum load of concrete decrease with the increase of initial crack depth ratios, the toughness of three point bending beam＇s concrete specimen is better when the initial crack-depth ratio is 0.3 or 0.4, the values of initiation toughness and unstable toughness change little and both can be considered as constant. The higher the strength grade, the
出处
《防灾减灾工程学报》
CSCD
北大核心
2013年第2期162-168,共7页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(51279111)
水利部公益性行业科研专项(201201038)
江苏省研究生科研创新计划项目(CXLX12-0229)资助
关键词
混凝土断裂特性
缝高比
双K断裂准则
三点弯曲梁
断裂韧度
断裂能
concrete fracture feature crack-depth ratio double-K fracture criterion three-pointbending beam fracture toughness fracture energy
