超声回弹综合法检测单一构件混凝土强度推定值的保证率分析

在实际工程检测数据的基础上,利用M on te C arlo试验对单一构件混凝土强度推定值的保证率问题进行了分析。30片梁板实测数据分析结果表明:将构件各测区混凝土强度换算值的最小值作为该构件的混凝土强度推定值的保证率范围为79.0%~94.2%,小于《超声回弹综合法检测混凝土强度技术规程》(CECS 02:88)规定的95%保证率要求,因此,对结构性能鉴定而言该混凝土强度推定值是偏于不安全的,应引起试验检测人员的充分重视。

On the cumulative frequency of the estimated concrete strength for single concrete structural member in the ultrasonic-rebound combined method

Based on the testing data of thirty slabs from a highway engineering,the cumulative frequency of the estimated concrete strength for single concrete structural member is analyzed by use of Monte Carlo simulation.The calculated result shows that the cumulative frequency is ranged from 79.0% to 94.2% for the tested slabs,smaller than the value required by the technical specification for testing concrete strength by ultrasonic-rebound combined method(CECS 02:88).Therefore,more attention should be paid to the problem of cumulative frequency in testing practice.