CAJ | 학술논문

通过对有脱空缺陷的方钢管混凝土柱试件进行瞬态冲击作用下的检测试验，提出了根据振动信号频率变化、频谱峰值和WVD时频分布中频率的时间连续性等特征来进行脱空检测的新方法。基于WVD时频分布特性，提出了使用平均频率作为脱空判别指标。结果表明：当方钢管混凝土柱存在脱空，振动信号的平均频率发生明显降低，频谱图中频率成分简单，归一化频谱峰值高，在WVD时频分布三维图上呈现沿时间轴连续的偏平峰。说明该方法对检测方钢管混凝土柱脱空具有一定的有效性。
통과대유탈공결함적방강관혼응토주시건진행순태충격작용하적검측시험，제출료근거진동신호빈솔변화、빈보봉치화WVD시빈분포중빈솔적시간련속성등특정래진행탈공검측적신방법。기우WVD시빈분포특성，제출료사용평균빈솔작위탈공판별지표。결과표명：당방강관혼응토주존재탈공，진동신호적평균빈솔발생명현강저，빈보도중빈솔성분간단，귀일화빈보봉치고，재WVD시빈분포삼유도상정현연시간축련속적편평봉。설명해방법대검측방강관혼응토주탈공구유일정적유효성。
A specimen of concrete-filled square tubular column with typical void defects is employed under transient impulse in the experiment. And a new method to detect the void is presented, which works according to the changes of frequency, the peak in frequency domain graph and the time continuity of frequency in WVD time-frequency distribution graph of vibration signal. The mean frequency based on the characteristic of WVD time-frequency distribution is proposed to judge void. The results show that the mean frequency of vibration signal reduces obviously, the frequency components are simple, the peak of normalized spectrum is high, continuous partial flat peak appears in three dimensional graph of WVD time-frequency distribution, when the void is present in the square concrete-filled tubular column, which verified the validity of the method to detect the void in square concrete-filled tubular column.