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| Damage Detection of Truss Structure Based on Strain Mode Analysis |
| WEN Yin-tang1, ZHANG Yu-yan2, ZGANG Li-li2, LUO Xiao-yuan2, WANG Hong-rui2 |
1.School of Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004, China;
2.Institute of Electrical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China |
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Abstract Taking the truss structure as the research object, the strain modal analysis is used to identify the damage of the truss structure. The strain modal can be deduced from displacement model shapes,then the difference of strain modal is used to be truss structural damage detection index,and the damage threshold based on the 3σ criteria is presented. Through the strain mode difference and damage threshold of contrast to determine whether there is damage and locate it,furthermore preliminary determine the extent of the truss structure with the size of the strain difference between before and after injury. The damage conditions of single damage and multiple damages in different degree of a practical truss structure,are numerically simulated with finite element software numerical simulations respectively.Furthermore further experiment research,by applying this method to actual truss damage detection,proves the effectiveness of the proposed method.
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2014, Vol. 35 
