Abstract
A method for least squares parameter identification of shear building models that consider three degrees of freedom for each story is presented. Excitation is obtained from two orthogonal components of horizontal ground motion induced by an earthquake. Knowledge of these parameters is very useful for applying semiactive control techniques that mitigate buildings vibration and help to avoid permanent damage in the structure. The method introduces a variation of the conventional least squares formulation that allows a very important reduction on the number of involved calculations that makes it possible to achieve real-time implementation. To test the methodology, a set of data recorded in two instrumented buildings during an earthquake is used. Obtained results show the efficacy of the algorithm in reconstructing stories accelerations and recovering fundamental natural vibration frequencies.
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