Experimental study of damage identification based on operational strain mode shape
Gu Pei-ying1,2 ; Deng Chang1,2; Tang Lei1,2
1.Nanjing Hydraulic Research Institute, Nanjing 210029, China; 2.Key laboratory of Water Science and Engineering, Ministry of Water Resources, Nanjing 210029, China
Abstract：Operational strain mode shape (OSMS), direct index methods of damage location detection (named as ) and damage degree detection (named as ) are introduced in the paper. The methods were advanced in recent years by author. Then, the results of model test and numerical simulation are applied to verify the methods. The results show that the operational strain mode shape is similar to the strain mode shape under impact excitation. According to the results, direct index methods of damage location detection and damage degree detection are also improved. The direct index value of damage location detection at damage location is greater than the index value at undamage location, and, the damage location detected is in accord with actual damage location. Furthermore, when damage degree is equal, the variation of is slight. The value of is independent of damage location, order number of strain mode shape and normalization. If the space between of damages is longer than length affected, the methods can be applied to the multi-damage detection of structure.
2011, Vol. 30 
