Responses of a 58-story RC dual core shear wall and outrigger frame building inferred from two earthquakes

Earthquake Spectra
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Abstract

Responses of a dual core shear-wall and outrigger-framed 58-story building recorded during the Mw6.0 Napa earthquake of 24 August 2014 and the Mw3.8 Berkeley earthquake of 20 October 2011 are used to identify its dynamic characteristics and behavior. Fundamental frequencies are 0.28 Hz (NS), 0.25 Hz (EW), and 0.43 Hz (torsional). Rigid body motions due to rocking are not significant. Average drift ratios are small. Outrigger frames do not affect average drift ratios or mode shapes. Local site effects do not affect the response; however, response associated with deeper structure may be substantial. A beating effect is observed from data of both earthquakes but beating periods are not consistent. Low critical damping ratios may have contributed to the beating effect. Torsion is relatively larger above outriggers as indicated by the time-histories of motions at the roof, possibly due to the discontinuity of the stiffer shear walls above level 47.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Responses of a 58-story RC dual core shear wall and outrigger frame building inferred from two earthquakes
Series title Earthquake Spectra
DOI 10.1193/011916EQS018M
Volume 32
Issue 4
Year Published 2016
Language English
Publisher EERI
Contributing office(s) Earthquake Science Center
Description 23 p.
First page 2449
Last page 2471
Country United States
State California
City Berkeley, Napa