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《Journal of Yanshan University》 2012-06
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Damage identification based on deformation difference curvature in unit load for load-carrying steel structures

HAN Dong-ying1,SHI Pei-ming2,YANG Xin-jun1,CHU Qing-zhong1,LI Ji-zhao2(1.College of Vehicles and Energy Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China;2.College of Electrical Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China)  
Damage is the most important factor that influences the capacity of load-carrying steel structures.To diagnose damage precisely and in time is premise to ensure the safety and reliability of the system.Because flexibility is more sensitive to damage than natural frequency and mode shape,a novel method based on deformation difference curvature in unit load from flexibility matrix is proposed for damage identification for load-carrying steel structures.The opinion of dynamic flexibility and static deformation are combined into this method,so changing in static characteristics can be reflected when dynamic test dada changed.And deformation difference curvature in unit load will be changed more obviously once damage exist or enlarge.Firstly,flexibility matrix is built according to the low measurement modal data;secondly,the relational expression between deformation in unit load and flexibility matrix are derived;and then,combined the idea of modal curvature and deformation difference,the damage identification method is demonstrated with deformation difference curvature in unit load;finally,damage of load-carrying steel structures model is identified by this method.Results show that single and two-damage can both be identified accurately only using the first frequency and modal shape;multi-damage can also be identified,but the accuracy is declined.On the whole,it is acceptable in engineering.
【Fund】: 国家自然科学基金资助项目(51104129);; 河北省自然科学基金青年基金项目(E2011203153);; 河北省高等学校科学技术研究青年基金项目(2010163)
【CateGory Index】: TU391;TU312.3
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