| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 95 === Buildings could be damaged, more or less, due to story earthquake. In order for effectively evaluating the level and location of damage, a system identification technique would be applied to the buildings with measured data. The identification accurately of the fundamental vibration period is the best among all the dynamic parameters of a structural system. However, such an identified value is valid only in judging the level of damage, but is independent of the location of damage. It is necessary to identify the story flexural rigidity of columns for judging both the level and the location of damage. A nonlinear regression analysis in time domain is performed in this story to identify the story flexural rigidity of beams and columns in non-shear buildings with time-varying characteristics. It is shown that the identified results are almost identical to the exact ones for the cases of complete measurement without noises, in spite of where and how the damage is assumed. For the cases of complete measurement with noises, the identified values of the flexural rigidity of columns in the upper floors are deviated from the exact ones. However, the relative variations of the story flexural rigidity of columns identified in several separate time windows are so matched to the pre-assumed time-varying behaviors that it is good enough to distinguish the damaged floors and to evaluate the level of damage.
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