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在工程质量验收和结构性能评定中,往往需要确定结构实体中混凝土强度。现场检测混凝土强度一般采用抽样检测,根据样本数据得到结构实体中混凝土强度的推定值。回弹法等无损检测技术规程中一般都以样本均值减1.645倍样本标准差得到的值作为结构实体中混凝土强度的推定值,由于未考虑抽样检测必然存在的置信度的问题,这样的推定存在一定的缺陷。本文考虑样本统计量的概率分布规律,采用非中心t概率分布函数对混凝土强度进行推定。这种推定方法与设计规范、验收规范和检验评定标准的要求基本一致,因此得到的推定值可作为工程质量验收和结构性能评定的依据。
In engineering quality acceptance and structural performance assessment, it is often necessary to determine the strength of concrete in structural entities. In situ testing of concrete strength is generally carried out by sampling, based on the sample data to obtain the estimated value of concrete strength in structural entities. Rebound method and other non-destructive testing procedures are generally the sample mean minus 1.645 times the sample standard deviation of the value obtained as the concrete structure of the concrete strength of the estimated value of the sample test is not taken into account the existence of confidence in the existence of such a presumption of existence Certain defects. In this paper, the probability distribution of sample statistics is considered, and the non-center t probability distribution function is used to estimate the concrete strength. This presumption method and design specifications, acceptance criteria and test evaluation standards are basically the same, so the estimated value can be used as the project quality inspection and structural performance evaluation basis.