Damage diagnosis of pre-stressed concrete beam based on D-S evidence theory

The sensitivity of the damage index is important to the identification of structural damage. Through the dynamic test of three unbonded pre-stressed concrete beams, the methods of shape parameter damage identification and curvature modal damage identification were taken to assess the damage degree and the damage location of experimental beams. The information fusion technology based on D-S evidence theory was used to make the comprehensive diagnosis analysis and verification of vibration model change difference and absolute value curvature difference which were got by the two methods. The study shows that: the use of comprehensive diagnosis of many modal parameters is more sensitive than those of one for the damage test, which can increase the diagnostic accuracy of damage and has a wide application.