Abstract
In order to find out a handy and effective method in structural damage detection, plate, steel shell and five stories steel frame structure model tests are carried out. Based on experiment results and Ohm’s auditory law, Musical Tone Law Method (MTLM) in structural damage detection is proposed. This method is effective for symmetrical structure in structural damage detection, such as framed structure, cable structure, shell structure, and so on. It is clear that Fourier spectrum of symmetrical structure is similar to musical tone’s according to the model tests. That is just the fundament theory of MTLM. Model tests prove that MTLM is effective in detecting damage of China disk and radial damage of steel shell. However, it is invalid for circular damage of steel shell, and the dominating causation is that circular damage makes stiffness of steel shell decrease little. In the damage detection test of five stories steel frame structure, it is first time to use the frequency ratio as diagnostic parameter in structural damage detection filed, and damage was detected successfully.
Key words
musical tone law method /
structural damage detection /
vibration measurement /
spectrum analysis /
steel shell
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LIU Hong-biao; GUO Xun; LI Guo-dong.
Musical tone law method and its application in structural damage detection [J]. Journal of Vibration and Shock, 2011, 30(10): 254-259
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