Abstract
Multi-Input-Multi-Output ARX model of Modal Analysis (MIMO-ARX-MA), which is based on the idea that there are common natural frequencies and damping ratios throughout the system, is proposed in this paper. Utilizing response records of multiple observation points together can make the estimation more precisely. In the case of structures whose torsional modes are excited it is necessary to use multiinput model including across direction components. The model proposed here is applied to the earthquake observation records of a triangular planned high-rise building with Hybrid Mass Dampers (HMDs) and the modal parameters of the building, such as natural frequencies, damping ratios, and participation vectors, are estimated, which shows the effectiveness of the proposed model. The effects of HMDs on the modal parameters of the building are also presented.
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