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Isolated Buildings and the 1997 UBC Near-Source Factors

Hall, John F. and Ryan, Keri L. (2000) Isolated Buildings and the 1997 UBC Near-Source Factors. Earthquake Spectra, 16 (2). pp. 393-411. ISSN 8755-2930. http://resolver.caltech.edu/CaltechAUTHORS:HALes00

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Abstract

Computer simulations are employed to assess the effects of near-source ground motions on base-isolated buildings that meet the provisions of the 1997 Uniform Building Code. A six-story base-isolated building designed for Nv = 1.6 exhibits essentially elastic structural behavior when subjected to six actual ground motions containing strong near-source effects. However, two simulated records, one intended to represent the most severe motions from the 1994 Northridge earthquake and the other a strong motion from a hypothetical Mw7.0 thrust earthquake produce larger responses well into the nonlinear range. In addition, a 113 cm ground displacement pulse of three-second duration, which is close to the period of the isolated buildings, causes story drifts of nearly 5% for the Nv = 1.6 design and over 2% for a stronger Nv = 2 design. Such drifts are effectively reduced when supplemental dampers are added alongside the isolators. The original Nv = 1.6 design with supplemental damping in the amount of 20% of critical experiences only 1.3% drift for the same three-second ground displacement pulse.


Item Type:Article
Additional Information:©2000 Earthquake Spectra.
Subject Keywords:Uniform Building Code (UBC); 1997 edition, United States; building codes, Base isolation; near-field ground motion, Rubber bearings; nonlinear response, Multistory moment-resisting frames; story drift, Northridge, California earthquake, Jan. 17, 1994
Record Number:CaltechAUTHORS:HALes00
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:HALes00
Alternative URL:http://dx.doi.org/10.1193/1.1586118
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10584
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:20 May 2008
Last Modified:26 Dec 2012 10:02

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