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《Engineering Mechanics》 2011-09
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DAMAGE IDENTIFICATION OF DERRICK STEEL STRUCTURES BASED ON FREQUENCY AND EQUIVALENT DAMAGE COEFFICIENT

HAN Dong-ying1,SHI Pei-ming2(1.College of Vehicles and Energy Yanshan University,Qinhuangdao 066004,China; 2.Key Laboratory of Measurement Technology and Instrument of Hebei Province,Yanshan University,Qinhuangdao 066004,China)  
The determination of damage location and damage degree are important for safe service of derrick steel structures.To diagnose the damage correctly,a novel identification approach for derrick steel structures is proposed based on two indices,frequency and equivalent damage coefficient.Firstly,damage location is identified through the changes in the ratio of two neighboring frequencies and the ratio of the square of two neighboring frequencies.Secondly,equivalent damage coefficient is taken as the synthetical index to identify the existence and degree of system damage or element damage,and the relation between the frequency change rate and equivalent damage coefficient is established.After that,the objective function based on frequency is constructed,and an optimization method is applied to estimate quantitatively the damage degree.Finally,damage location and degree of some type of derrick steel structures are identified using the first three frequencies.Compared with other identification methods,the proposed method is more efficient and working-saving.This method can be also used for the damage diagnosis and health monitoring for other large structures.
【Fund】： 河北省自然科学基金项目(E2011203153);; 河北省高等学校科学技术研究项目(2010163);; 秦皇岛市科学技术研究与发展项目(201001A021)
【CateGory Index】： TU391;TU312.3
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