Deterioration Diagnosis of the Thirteen-ditches Tile Using Tap Tone Method and Discriminant Analysis

• Main Authors: Hao-Jyun Liao, 廖浩竣
• Other Authors: 郭斯傑
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/dmvd2n

碩士 === 國立臺灣大學 === 土木工程學研究所 === 105 === 　　In Taiwan, the ceramic tile is widely used for decorating material on buildings in Taiwan. It has the functions of insulation, protecting internal structures and beautifying buildings. However, the ceramic tile will deteriorate because of time passing and natural factors. And may cause the tiles scaling off to affect the public safety. 　　Comprehensively repairing external walls cost high and the construction duration is long, so it’s necessary to diagnose external wall before repairing. In the methods of diagnosing external wall, tap tone method has higher accuracy and the equipment is cheaper and easy to operate. Nevertheless, the testing result has no consistency by reason of the subjective judgement of the operator, and hard to quantify and record. Therefore, the research expect to find a way to quantify the audio collected by the tap tone method. It use an instrument which can produce consistent impact and sound receiving distance. Then using MATLAB to do FFT and calculate the two feature values of the audio, the peak value and the area of spectrum after standardization. 　　The research choose 4 building which using thirteen-ditches tile as the decorating material and have deteriorated for over 20 years. After doing the field experiment and collecting the audios, using the peak value and the area of spectrum after standardization as the variable of discriminant analysis. Through the analysis, the research receive a discriminant function of deterioration diagnosis for the thirteen-ditches tile. By doing so, the audio can be quantify and record. And the follow operator put the variable into the function and will diagnose the tile deteriorated or not.