Abstract
A frequency-domain method of physical-parameter system identification is developed for three-dimensional building structures with stiffness eccentricity. Equations of motion in the time domain are transformed into the frequency domain. The dynamic equilibrium of the free body above the j-th story is used to identify the j-th story stiffness and damping. It is required to measure the horizontal and rotational accelerations at all stories to identify the story stiffness and damping coefficients of all stories. Compared to the previous approach using the special identification function, the limit manipulation at zero frequency is unnecessary and is robust for noise. Furthermore, it should be remarked that the quantities of eccentricities in all stories can be identified using the slopes of the functions for torsional stiffness identification in the frequency domain.
Highlights
An innovative method is proposed for frequency-domain physical-parameter system identification (SI) of three-dimensional (3D) building structures with stiffness eccentricity, which accompany torsional vibration
While the previous approach using the special identification function has a difficulty in conducting the limit manipulation at zero frequency due to the influence of noise, the proposed method enables the evaluation of the identified value around the fundamental natural frequency having a smooth property
A new method of frequency-domain physical-parameter SI has been developed for three-dimensional building structures with stiffness eccentricity
Summary
An innovative method is proposed for frequency-domain physical-parameter system identification (SI) of three-dimensional (3D) building structures with stiffness eccentricity, which accompany torsional vibration. While the previous approach using the special identification function has a difficulty in conducting the limit manipulation at zero frequency due to the influence of noise, the proposed method enables the evaluation of the identified value around the fundamental natural frequency having a smooth property. The static test identified the lateral stiffnesses and those values are used as reference values for the identification using the shaking table tests
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