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A refined Frequency Domain Decomposition tool for structural modal monitoring in earthquake engineering

Earthquake Engineering and Engineering Vibration 2017年第3期16卷 627-648页

作者： Fabio pioldi Egidio Rizzi Department of Engineering and Applied Sciences (Dalmine) University of Bergamo viale G. Marconi 5 1-24044 Dalmine (BG) Italy

Output-only structural identification is developed by a refined Frequency Domain Decomposition（rFDD） approach, towards assessing current modal properties of heavy-damped buildings（in terms of identification challenge）, under strong ground motions. Structural responses from earthquake excitations are taken as input signals for the identification algorithm. A new dedicated computational procedure, based on coupled Chebyshev Type Ⅱ bandpass filters, is outlined for the effective estimation of natural frequencies, mode shapes and modal damping ratios. The identification technique is also coupled with a Gabor Wavelet Transform, resulting in an effective and self-contained time-frequency analysis framework. Simulated response signals generated by shear-type frames（with variable structural features） are used as a necessary validation condition. In this context use is made of a complete set of seismic records taken from the fema p695 database, i.e. all 44 ＂Far-Field＂（22 NS, 22 WE） earthquake signals. The modal estimates are statistically compared to their target values, proving the accuracy of the developed algorithm in providing prompt and accurate estimates of all current strong ground motion modal parameters. At this stage, such analysis tool may be employed for convenient application in the realm of Earthquake Engineering, towards potential Structural Health Monitoring and damage detection purposes.

关键词： Operational Modal Analysis (OMA) modal dynamic identification refined Frequency Domain Decomposition(rFDD) fema p695 seismic database earthquake response identification input

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