Abstract
It is currently known that using stress wave and drilling resistance to detect the internal damage in the ancient timber structure is not a highly precise process. To improve the detection precision of this process, a simulation test was used to detect the internal damage of poplar and elm in ancient buildings. In this empirical study, we compared the detection precision of these two detection methods. Based on the idea of variable weight, we introduced three combined forecasting models based on the IOWA operator, IOWGA operator, and IOWHA operator to predict the internal damage in the ancient timber structure. The results show that the combined forecasting model based on the IOWA operator is more effective in predicting compared to a single detection method and other combined forecasting models. To be more specific, the results show that the detection precision of the combined model is increased by 25.8% and 4.7%, respectively, compared to the precision of the stress wave and drilling resistance tests. The error indicators of the combined forecasting model based on the IOWA operator are better than those of the other combined forecasting models. In addition, the analysis results based upon cross-validation theory show the combined forecasting model based on the IOWA operator has the best applicability, which provides a new practical method for evaluating internal damage of timber components in ancient buildings.
Highlights
Ancient timber structures have high historical value, artistic value, and cultural value
When there is no internal damage in the specimen (see Figure 7(a)), the two-dimensional image detected by stress wave tests is green, and the relative impedance curve detected by drilling resistance tests is continuous
While the internal hollow is small, pale yellow (see Figure 7(b)) and red (see Figure 7(c)) colors are presented in the center of the two-dimensional image detected by stress wave tests
Summary
Ancient timber structures have high historical value, artistic value, and cultural value. Used nondestructive testing methods [2] for detecting the internal damage of timber components mainly include stress wave [3,4,5], X-ray scanning [6,7,8], drilling resistance [9,10,11], and ultrasonic wave [12,13,14]. Is greatly reduced the sensitivity of the result to a poor detection method It effectively improved the forecasting precision of the internal damage of wooden components in ancient buildings. E following four steps are used for evaluating the internal defect of wood components in ancient buildings based on the optimal combined forecasting model: Step 1: considering the relative lower costs of equipment and simpler execution in field applications, test methods based on stress wave and drilling resistance were used to detect the internal defects of poplar and elm based on the idea of reverse simulation. Step 4: according to the cross-validation theory [43], the optimal combined forecasting method was generalized into a model
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