Evaluation and Characterization of Probabilistic Alongwind and Crosswind Responses of Base-Isolated Tall Buildings
Publication: Journal of Engineering Mechanics
Volume 145, Issue 12
Abstract
The uncoupled alongwind and crosswind responses of base-isolated tall buildings with hysteretic restoring force characteristics are quantified through response time history analysis and statistical linearization approach. The upper building is modeled as a linear elastic multiple-degrees-of-freedom shear building. The story wind forces are represented in their cross power spectra. Response history analysis is carried out to characterize the crosswind response with zero mean component and alongwind response with time-varying mean component. The response statistics including time-varying mean, standard deviation (STD), and extreme and fatigue damage at different wind speeds are quantified. The fluctuating alongwind and crosswind responses can, to some extent, be unified with respect to their corresponding elastic responses, while the alongwind base displacement has a greater low-frequency drift, a larger STD and weaker softening non-Gaussian character. As compared to fixed-base building, the building displacement and acceleration of base-isolated building at higher wind speeds are greatly reduced due to the effect of hysteretic damping. The higher mode contributions can be ignored in building displacement, but are noticeable in building acceleration. Analytical estimations of the response statistics by using statistical linearization approach with Gaussian assumption are also presented and the challenges posed by non-Gaussian response character are pointed out. A comprehensive parametric study is performed to explore the effects of various building parameters on the response of base-isolated buildings.
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Acknowledgments
The support for this work provided in part by NSF Grant Nos. CMMI-1400224 and CMMI-1536108 is greatly acknowledged.
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Published In
Journal of Engineering Mechanics
Volume 145 • Issue 12 • December 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: May 1, 2018
Accepted: Apr 10, 2019
Published online: Sep 24, 2019
Published in print: Dec 1, 2019
Discussion open until: Feb 24, 2020
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