摘要
对混凝土试件进行了模拟特殊自然环境条件下的加速失效试验,并得到了加速寿命数据.首先,结合寿命数据采用Weibull分布函数对其退化过程进行建模;其次,应用不同参数估计方法得到了基于Weibull分布参数的估计值;最后,建立了服役寿命的可靠度函数及概率密度函数.结果表明:Weibull分布函数可以有效地描述混凝土试件的加速耐久性能退化过程,建立的混凝土加速寿命可靠度函数能够直观地反映试件的服役寿命,并且与试验结果较一致;在参数估计方法的适用性方面,最小二乘法以及极大似然估计法比较适合小样本完全寿命数据的情况,这为混凝土加速失效试验的寿命预测及可靠性评估提供了直接而有效的参数估计方法.
An accelerated failure test of concrete was conducted in a special natural environment,and accelerated life data were obtained.Firstly,the Weibull distribution function was used to model the degradation process by combining the life data.Then,the parametric estimation of the Weibull distribution was proposed by using different parameter estimation methods.Finally,the reliability and probability density functions of service life were established.The results showed that the Weibull distribution can describe the durability degradation of concrete specimens effectively.By using this method,the accelerated life reliability function of concrete can reflect the service life of the specimen directly,and the experimental value is in good agreement with the lifetime prediction.In applying the parameter estimation method,the least square(LSE)method and maximum likelihood estimation(MLE)methods are suitable to obtain complete life data for small samples.This provides a direct and effective method to estimate the parameters for lifetime prediction and reliability evaluation of the accelerated failure test of concrete.
作者
乔宏霞
冯琼
朱彬荣
魏智强
路承功
王鹏辉
QIAO Hongxia;FENG Qiong;ZHU Binrong;WEI Zhiqiang;LU Chenggong;WANG Penghui(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;School of Civil Engineering,Southeast University,Nanjing 211189,China;School of Science,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2020年第4期993-1005,共13页
Journal of Basic Science and Engineering
基金
国家自然科学基金项目(51468039)
兰州理工大学建工七七基金资助项目(TM-QK-1604)
关键词
混凝土
加速试验
寿命预测
WEIBULL分布
参数估计
可靠性
concrete
accelerated test
lifetime prediction
Weibull distribution
parametric estimation
reliability