中文摘要：

随着大型土木工程的兴建，采用先进的仪器和科学的方法来进行在线监测和诊断对结构健康状况的评估起着越来越重要的作用。但无论是基于固有频率变化，还是振型变化，以及基于柔度或刚度变化的测量方法，都存在着一个共同的局限性，就是对微小损伤和疲劳损伤的识别，由于其探测灵敏度不够，显得力不从心，因此需要寻找一种更有效的损伤检测手段。小波变换作为一种新的信号处理方法，综合了时域分析方法和频域分析方法的优点，属于多分辨率的时频分析方法，具有伸缩、平移和放大功能，可以用不同的尺度或分辨率来观察信号，实现既在时域又在频域的高分辨局部定位，对于非平稳信号的处理是非常适合和必要的，正是结构损伤检测的基本要求。给出了结构整体进行损伤判别的方法，将各层能量在各频段进行分解，通过能量变化情况给出了结构损伤程度的判定方法，并且在三层钢筋混凝土框架结构的损伤判别试验中得到应用，试验结果与理论分析吻合较好，从而证明了提出的损伤判别方法的可行性与准确性。

英文摘要：

With the development of the engineering construction, on-line monitor and diagnosis based on the advanced equipment and scientific methods play more and more important role.Among the inherent frequency based methods ,vibration mode based methods,and flexibility or stiff- ness based measurement method,a common limitation can not recognize the small and fatigue damage because of the measurement sensitivity. Wavelet transform, integrating the advantages of time domain and frequency domain analysis,belongs to time-frequency analysis method with multi-resolution.It has stretchable fuction, translation and zoom function and can observe the signal using different yardsticks or resolution which achieve high-resolution local orientation under time and frequency domain.It is very appropriate and necessary in non-stationary signal processing and meet the basic requirement for structural damage detection.The delamination wavelet-transform search method is derived to diagnosis the structure health.The structural energy is decomposed into inter-story energy in the different frequency band and the damage can be determined through the energy changes.The method is tested in a three-story RC flame structure.The test result is in good agreement with theoretical analysis, which indicates that the method is feasible and accuracy.