Frequency-domain stiffness identification based on accelerations on specific floors in asymmetric buildings

This paper proposes a new method of frequency-domain physical-parameter identification of three-dimensional building structures with stiffness eccentricity. The two-directional j-th story stiffnesses are identified on the frequency domain by using the dynamic equilibrium of the free-body above the j-th story. The horizontal accelerations recoded at the top and first floors are required for the identification. The proposed method is simple and avoid complicated mathematical manipulation. It is demonstrated through numerical simulations that identification results are stable and robust for noise. Furthermore, experiments made clear the reliability and accuracy of the proposed method.