Abstract
To accurately predict and quantify the potential structural damage (PSD) of ground motion records (GMRs), an intensity measure (IM) that correlates well with the structural response is needed. This paper proposes an exploratory factor analysis (EFA)-based approach for developing a compound intensity measure (CIM) for characterizing the PSD of GMRs. EFA is used to preferentially extract principal factors that are related to the acceleration, velocity and displacement of GMRs through compression of the selected IMs of three groups of GMRs. Then, the CIM is developed with a linear combination of the extracted principal factors on a log-scale. The explanations of variance corresponding to each principal factor are used to quantify the contributions of a single IM to the developed CIM. Applications to single-degree-of-freedom (SDOF) systems modeled with different hysteretic models and multiple-degree-of-freedom systems subjected to three groups of GMRs demonstrate the feasibility of the proposed approach. The results of the correlation between the developed CIM and structural demand confirm the robust performance of the proposed approach in estimating the predictability of the developed CIM for measuring the PSD of GMRs. The efficiency of the developed CIM for SDOF systems is found to be approximately of the same magnitude irrespective of hysteretic models, and the developed CIM is sufficient and proficient in structural demand evaluation with good confidence.
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Acknowledgements
This investigation is supported by the National Natural Science Foundation of China (U1939210) and National Key R&D Program of China (2018YFC1504401). These supports are gratefully acknowledged. The authors are grateful to the anonymous reviewers for the constructive comments and suggestions.
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This study was supported by the National Natural Science Foundation of China (U1939210) and National Key R&D Program of China (2018YFC1504401).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by JH and BL. The first draft of the manuscript was written by BL and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Liu, B., Hu, J. & Xie, L. Exploratory factor analysis-based method to develop compound intensity measures for predicting potential structural damage of ground motion. Bull Earthquake Eng 20, 7107–7135 (2022). https://doi.org/10.1007/s10518-022-01505-w
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DOI: https://doi.org/10.1007/s10518-022-01505-w