Evaluation and Characterization of Probabilistic Alongwind and Crosswind Responses of Base-Isolated Tall Buildings

Changda Feng, Xinzhong Chen

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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.

Original languageEnglish
Article number04019097
JournalJournal of Engineering Mechanics
Volume145
Issue number12
DOIs
StatePublished - Dec 1 2019

Keywords

  • Alongwind response
  • Base isolation
  • Bouc-Wen model
  • Crosswind response
  • Inelastic response
  • Statistical linearization
  • Tall buildings

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