From the application background of damage detection of civil engineering structures, a new evidence combination method is proposed based on information fusion technique. By introducing the concept of evidence ullage, the evidence combining rule of evidence theory is extended and improved, and the formulas of evidence ullage and evidence tendency factor are presented as well. The new rule is not only capable of containing Dempster combining method, but capable of solving the problems of evidence conflict and evidence compatibility caused by multi-source uncertain information. therefore, compared with the traditional evidence combination method, the new rule is more suitable for engineering application. With various experimental conditions considered, a spatial truss structure model is used to conduct damage detecting test. The experimental result indicates that the damage detection method based on improved evidence theory can make full use of multi-source uncertain information and enhance diagnostic accuracy effectively.
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