Location

San Diego, California

Session Start Date

3-26-2001

Session End Date

3-31-2001

Abstract

Free-field ground motion during earthquake can be conveniently represented by response spectrum for a given level of damping and ductility. Typical response spectra have been established in several seismic codes, as the Eurocode EC8, but for real seismic events some disagreements may be still encountered. The disagreements come from the presence of soil formations or local site conditions which can differ G-om those provided by seismic codes. During the recent Umbro-Marchigiano earthquake, happened in Italy in the September-October 1997, 198 records ofhorizontal acceleration have been collected from more than 30 accelerometric stations. Soil conditions have been known in detail for 90 records so allowing their classification into four categories: hard rock (28 records), weak rock (28 records), stiff soil (20 records) and soft soils (14 records). Depending on soil conditions, elastic and inelastic response spectra of acceleration, velocity and displacement have been evaluated for discrete values of damping ratio and ductility factor. Comparisons have shown that for soft soil the Umbro-Marchigiano earthquake gives an elastic acceleration spectrum and a displacement spectrum which are less conservative than those provided by EC8.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-26-2001

Document Version

Final Version

Rights

© 2001 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 26th, 12:00 AM Mar 31st, 12:00 AM

Site Dependent Spectra for the Umbro-Marchigiano Earthquake (Italy) of September-October 1997

San Diego, California

Free-field ground motion during earthquake can be conveniently represented by response spectrum for a given level of damping and ductility. Typical response spectra have been established in several seismic codes, as the Eurocode EC8, but for real seismic events some disagreements may be still encountered. The disagreements come from the presence of soil formations or local site conditions which can differ G-om those provided by seismic codes. During the recent Umbro-Marchigiano earthquake, happened in Italy in the September-October 1997, 198 records ofhorizontal acceleration have been collected from more than 30 accelerometric stations. Soil conditions have been known in detail for 90 records so allowing their classification into four categories: hard rock (28 records), weak rock (28 records), stiff soil (20 records) and soft soils (14 records). Depending on soil conditions, elastic and inelastic response spectra of acceleration, velocity and displacement have been evaluated for discrete values of damping ratio and ductility factor. Comparisons have shown that for soft soil the Umbro-Marchigiano earthquake gives an elastic acceleration spectrum and a displacement spectrum which are less conservative than those provided by EC8.