Modal Identification of Civil Structures via Stochastic Subspace Algorithm with Monte Carlo–Based Stabilization Diagram

AbstractThe stochastic subspace algorithm is one of the most widely used structural identification techniques, which is generally involved with the stabilization diagram for estimating modal parameters. However, the conventional stabilization diagram has an inherent problem: some spurious modes may...

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Bibliographic Details
Published in:Journal of structural engineering (New York, N.Y.) N.Y.), 2022-06, Vol.148 (6)
Main Authors: Zhou, Kang, Li, Qiu-Sheng, Han, Xu-Liang
Format: Article
Language:English
Subjects:
Algorithms
Computer simulation
Estimation
Modal identification
Parameters
Robustness (mathematics)
Skyscrapers
Stabilization
Structural engineering
Subspaces
Technical Papers
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Summary:AbstractThe stochastic subspace algorithm is one of the most widely used structural identification techniques, which is generally involved with the stabilization diagram for estimating modal parameters. However, the conventional stabilization diagram has an inherent problem: some spurious modes may be identified as stable results, resulting in adverse effects on structural modal identification. To address this critical issue, this paper proposes an improved stochastic subspace algorithm involving a Monte Carlo–based stabilization diagram. Through a numerical simulation study, the good performance of the Monte Carlo–based stabilization diagram for discriminating the poles denoting the physical modes from those representing spurious modes is demonstrated. The numerical simulation results show that the proposed method can estimate structural modal parameters with high accuracy and robustness. Moreover, the proposed method is applied to field measurements on a 600-m-high skyscraper during Super Typhoon Mangkhut, and the results verify the applicability and effectiveness of the proposed method to field measurements. This paper aims to provide an effective tool for accurate estimation of modal parameters of civil structures.
ISSN:0733-9445
1943-541X
DOI:10.1061/(ASCE)ST.1943-541X.0003353