![]() In addition to the identified first-order state space model, a second-order mechanical model of the frame structure is experimentally obtained employing a methodology for constructing mechanical models from identified state-space representations. In particular, the fundamental matrices that characterize the state-space representation of a general linear time-invariant dynamical system are obtained from the identified system Markov parameters. To this end, a numerical procedure based on the combination of the Observer/Kalman Filter Identification Method (OKID) with the Eigensystem Realization Algorithm (ERA) is employed for determining the sequence of system Markov parameters. Subsequently, a more realistic second-order model of the frame structure is obtained directly from input-output experimental data. A preliminary mechanical model of the two-story shear building system is developed by using a lumped parameter approach. The case study considered in this work is a frame structure that can be modeled as a two-story shear building system. ![]() The identification method developed in this paper is based on time-domain system identification numerical techniques. ![]() The proposed methodology is corroborated by analytical considerations and is verified experimentally. In this paper, an effective method for performing the experimental modal analysis of structural systems is developed. ![]()
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