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Application of structural damage identification method based on element modal strain energy and residual modal force in tower truss

WANG Nan,JIANG Jianhua(School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200092,China)  
To identify damage location of engineering structures rapidly and accurately and improve the safety performance and service life effectively,the damage identification of a tower truss is performed by element modal strain energy method and residual modal force method.The truss mode is analyzed for a healthy structure and several kinds of structures with different damage degree by MSC Marc;the modal parameters of the structures are extracted from the modal analysis results by MATLAB programming;the change rate of element modal strain energy and residual modal force corresponding to degree of freedom of each structural node are calculated and the structure damage is identified.The results indicate that the change rate of element modal strain energy and residual modal force are effective and accurate identifiers for structural damage identification.
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