Structural Damage Detection Based On Strain Test

Damage diagnosis and safety monitoring of structure are one of the hot topics in engineering circle in recent years,for the further study, it has been listed in the national important scope and the preferential topic in mid-and-long term development programs in science and technology that "major disaster monitoring and prevention" and "early warning and rescue of major industrial accidents".So,operational modal parameter identification and damage diagnosis are studied in time domain based on the measured Strain of cantilever which is induced by discharge flow,and this provids the basis for major structural damaged diagnosis and monitoring.The study includes the following several respect mainly:(1)By a numerical example, strain mode can be considered as the damaged index to estimate weather the damage is existence or not,and also to detect location of damage.(2)Stochastic subspace identification(SSI) method based on strain test is presented,and the operational modal parameters of the structure is studied in time domain induced by ambient vibration.(3)Through the strain measurement, the sensitive features of damage is selected to damage diagnosis of the cantilever beam structure.