混凝土断裂能的统计模型和标准值研究  

Research on statistical model and characteristic values for the fracture energy of concrete

作　　者：丁力栋 丁晓唐[1] 袁存 DING Lidong;DING Xiaotang;YUAN Cun(College of Civil and Transportation Engineering,Hohai University,Jiangsu Nanjing,210098,China)

机构地区：[1]河海大学土木与交通学院,江苏南京210098

出　　处：《河北工程大学学报（自然科学版）》2017年第4期5-9,共5页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金资助项目(51279052)

摘　　要：采用三点弯曲法测定不同工况的混凝土断裂能,并就其中一个工况进行大样本试验。根据试验和收集文献中的数据建立断裂能基于混凝土强度和粗骨料最大粒径的双因素统计模型,将该统计模型与其他统计模型对比发现,其预测能力更好。应用统计分析软件SAS针对选用工况的试验数据进行了4种概率分布、5种拟合优度检验,得到该工况断裂能最符合的概率分布为对数正态分布,从而计算得到具有95%保证率的断裂能标准值GFk=66.0 N/m。The fracture energy of concrete for different cases is calculated by means of three-point bend tests,and large sample tests of one case are done.Based on the test data of this experiment and other articles,statistical model about fracture energy of two factors,concrete strength and maximum aggregate size,are established.Compared the statistical model with other models,the ability of prediction is better than other models,and it can prove rationality of test data indirectly.Statistical analysis system(SAS)is applied to compare four probability distribution and five goodness-of-fit tests,the most suitable probability distribution of test data is lognormal distribution.Based to lognormal distribution,the characteristic value of fracture energy is equal to66.0N/m,the reliability is not less than95%.

关 键 词：混凝土 断裂能 统计模型 概率分布 标准值 

分 类 号：TU528.1[建筑科学—建筑技术科学]