Abstract

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Title:: Damage Identification Test and Finite Element Analysis of Simply Supported Steel Beam Based on Energy Dissipation Method

Author(s):: XUE Gang; WANG Chong-ge; School of Architecture and Civil Engineering, Inner Mongolia University of Science and Technology

Keywords:: energy dissipation; simply supported steel beam; multiposition damage; damage identification; modal expansion; finite element analysis

Abstract:: To solve the problems of identifiable accuracy and practical applications existing in present beam structure damage identification, on the basis of energy dissipation, numerical analysis and test research of the simply supported Ibeam were carried out. According to the relationship between the modal strain energy dissipation ratio and the change of modal strain energy in each element before and after damage of structures, the formula of damage variable of each element was deduced. The study results indicate that the calculation of damage variable only needs modal shape of damage and undamaged structure. In practical application, the problem of mismatching between the degrees of freedoms of the measurement model and those of the finite element model can be solved by means of modal expansion algorithms. The damage identification method can successfully detect the damage position of the simply supported steel beam and describe the damage degree to some extent.