| Title |
Accuracy and Stability Evaluation of Modal Damping Ratio Identification Techniques for High-rise Buildings |
| Authors |
윤다요(Yun, Da Yo) ; 박효선(Park, Hyo Seon) |
| DOI |
https://doi.org/10.5659/JAIK.2020.36.8.161 |
| Keywords |
Modal damping ratio; Modal parameters; Structural health monitoring; High-rise Building |
| Abstract |
Structural health monitoring (SHM) technology has been developed and applied to ensure the safety of building structures. For the safety
assessment through SHM, it is necessary to identify the modal parameters of the structure through the structural responses obtained using
various sensors. System identification (SI) techniques for identifying modal parameters of building structures have been developed in various
ways. Although various SI techniques have been developed, The study comparing the accuracy and stability of estimation results for modal
damping ratio from currently representative SI techniques has not been conducted. However, It is important to assess the accuracy and
stability of SI techniques, because the exact solution of the modal damping ratio cannot be known. In this study, The accuracy and stability
for modal damping ratio of SI techniques have been identified using enhanced frequency domain decomposition (EFDD), stochastic subspace
identification covariance-driven (SSI-COV), SSI data-driven (SSI-DATA), and numerical algorithms for subspace state-space system
identification (N4SID) methods, which are currently representative SI methods for high-rise buildings in the field. The accuracy and stability
of each method were compared and analyzed through the results of the probability density function of the identified modal damping ratio. As
a result, there was a difference in accuracy and stability identified in each method. Furthermore, it was confirmed that each method's
difference also occurred in the computational time required for analysis. |