Bayesian Method for Estimating the Characteristic Value of Concrete Strength Measured in Situ
Rebound method,core drilling method and rebound-core drilling correction method are commonly used in-situ concrete strength non-destructive detection methods,but the variance of concrete strength detected by rebound method is smaller than that by core drilling method,which is a common phenomenon in engineering practice.How to use the reasonable variance in the estimation of the strength characteristic value of the measured concrete directly affects the accuracy and rationality of the estimation result.Based on the statistical analysis of 120 existing structural concrete strength rebound core drilling correction method,the statistical parameters and their distribution rules of core drilling method and rebound method are obtained.It is suggested that 90％equivalent assurance rate should be adopted for the characteristic value of concrete strength in situ,and the evaluation coefficient corresponding to 0.1 quantile value is obtained by using Bayesian total probability formula.According to the mixed variance of rebound and core drilling method in the check area,and the calculated posterior variance by combining with the prior variance,the Bayesian estimation method of strength characteristic value of rebound-core drilling correction method is established,and the Bayesian estimation method of strength characteristic value of rebound method and core drilling method is obtained after simplification.Through the verification and analysis of the measured data of new projects and existing structures,it is shown that the Bayesian estimation method of strength characteristic values proposed in this paper is reasonable and accurate,which overcomes the defects of large error in variance value and insufficient sampling quantity in the current standard,and can be used in engineering quality compliance assessment and safety assessment of existing structures.
detection in situconcrete strengthcharacteristic valuenondestructive detectionvarianceBayesian method
国家科技期刊平台
NSTL
万方数据
