Experimental Research on Diagnosis of a Crack in Box - beam Based on Characteristics of the Strain Transmission

This paper is based on the analysis of the characteristics of the smicture's strain transmission, because thestrain of the structure is sensitive to partial structure change. This paper Puts forward a sensitive efficient of diagnosisof the crack by comparing the two strain's Fourier transform, and conductS a lot of modal experiments on non - crackor crack. The results show that this method is sensitive to the crack and has some Practical values.