New Measure for Severity of Near-Source Seismic Ground Motion
Publication: Journal of Structural Engineering
Volume 132, Issue 12
Abstract
In order to estimate seismic hazards, there is a need for measures that properly characterize the severity of ground motions. Such measures are used along with the fragility of structures to estimate the probability of failure. Structures subjected to severe seismic ground motions undergo inelastic response. Proper measures of ground motions are required to be well correlated with responses of interest. In this paper, it is shown that modeling a near-source ground motion, by a simple pulse form that matches well with the main velocity pulses of the ground motion, dose not lead to a reliable prediction of the inelastic response of structures having periods of less than about . An equivalent rectangular acceleration pulse, called the significant peak ground acceleration (SPGA), is defined. Compared to other available measures, the SPGA correlates significantly better with the inelastic response of structures (having periods of less than about and displacement ductility of at least two). Subsequently, using the main characteristics of structures, a relationship between the SPGA and the response of reinforced concrete (RC) structures is developed. It is shown that the relationship reliably predicts the inelastic response of the structures to pulse-type ground motions. Finally, the efficiency of the SPGA in estimating the fragility of an RC structural wall is compared to that of elastic response spectrum. Given the fact that in the United States about 99.8% of office buildings are less than ten stories, the SPGA and the corresponding demand models for estimating the response of such structures can considerably improve the seismic design and assessment of structures.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 132 • Issue 12 • December 2006
Pages: 1997 - 2005
Copyright
© 2006 ASCE.
History
Received: Nov 14, 2005
Accepted: Jan 19, 2006
Published online: Dec 1, 2006
Published in print: Dec 2006
Notes
Note. Associate Editor: Vinay Kumar Gupta
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