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《Earthquake Engineering and Engineering Vibration》 2005-04
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Application of strain mode in diagnosing damage to beam

Gu Peiying~(1,2), Chen Houqun~(3), Li Tongchun~(1), Deng Chang~(2)(1.Hohai University, Nanjing 210098, China; 2.Nanjing Hydraulic Research Institute, Nanjing 210029, China; 3.China Institute of Water Resources and Hydropower Research, Beijing 100044,China)  
Strain mode is applied to diagnosing the position and degree of structural damage, because of displacement modal parameter being insensitive to damage. The principles of damage effect on strain mode are studied. Based on the results of beam, it is concluded that strain modes are very sensitive to non-node damage. The abrupt change of strain is found around damage and the range is 12.5 percent of the beam if damage is 30 percent of its height. Furthermore, the change of strain mode is obvious, especially the first strain mode in middle span damage, the third and the second mode in quarter span damage. The value of the first strain mode shows equal downtrend in middle span damage. The first peak value of the third strain mode, the first and the second peak value of the second mode reduce to 58.6, 71.9 and 84.2 percent in quarter span damage of 30 percent.
【Fund】: 水利科技创新项目(SCX2002-16)
【CateGory Index】: TU317
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