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为了准确地获取古建筑木构件内部缺陷状况,采用应力波和阻抗仪2种无损检测方法,对古建筑常用树种榆木和杨木试件在不同缺陷类型、不同内部缺陷面积下进行试验,并基于Shapley值对其内部缺陷进行组合预测.研究结果表明:应力波能快速获取检测截面的二维图形,内部缺陷较小时误差率较大,当内部缺陷面积大于整个检测截面的1/4时应力波检测误差值逐渐减小.阻抗仪对单路径下的内部缺陷能够准确判断缺陷位置及缺陷类型.当木构件内部缺陷较小时阻抗仪检测结果较精确,内部缺陷面积扩大后阻抗仪检测误差变大.应用Shapley值方法,通过分配2种无损检测总误差来确定组合预测模型中应力波和阻抗仪的权重,构建组合预测模型,组合预测误差值均小于10cm2,检测精度高于单一的检测结果,可以为古建筑木构件工程的修缮和加固方案提供有效数据支持.
In order to accurately obtain the internal defects of ancient building wood components, two kinds of non-destructive testing methods of stress wave and impedance were used to test the elm and poplar samples of ancient buildings under different defect types and different internal defect areas Based on the Shapley value, the internal defects were predicted synthetically.The results show that the stress wave can quickly obtain the two-dimensional graph of the test section, the error rate is larger when the internal defect is smaller, and the internal defect area is larger than 1/4 of the test section The error value of wave detection decreases gradually.The impedance meter can accurately determine the defect location and type of defects in the single path of internal defects.When the internal defects of the wood components are small, the impedance instrument detection results are more accurate, the error of the impedance meter detection becomes wider after the internal defect area is enlarged The Shapley value method is used to determine the weight of the stress wave and impedance meter in the combined forecasting model by allocating two kinds of non-destructive test total errors. The combined forecasting model is constructed with the combined forecasting error of less than 10cm2 and the detection accuracy is higher than the single test result , Which can provide effective data support for the repairs and reinforcement schemes of old building wood components.