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On Near-Field Earthquake Ground Motion Simulation and its Effects on Long-Period Structures
Author(s) and Affiliation(s):
Ruichong Zhang and Masanobu Shinozuka Department of Civil Engineering University of Southern California, Los Angeles, CA
Principal Investigator:
Masanobu Shinozuka
Federal Highway Administration and National Center for Earthquake Engineering Research
Research Start Date:
January 1996
Expected Completion Date:
December 1996
Research Objectives:
Since the occurrence of large earthquakes in urban areas is highly likely in California (e.g. the 30-year probability for the San Francisco Bay area to be subjected to an earthquake with a magnitude of 7.0 or larger has been estimated to be about 67%), it is important to study the nature of the low-frequency components of the near-field earthquake ground motion and its effects on long-period structures. In this project, near-field Loma Prieta earthquake is simulated with the aid of a seismologically consistent earthquake ground motion model as well as record near-field ground motion data. The simulated earthquake ground motion is then used for computing response spectra, and for seismic response analysis of a realistic bridge with a long period in order to gain insight to both physical and engineering significance of the effects of near-field low-frequency earthquake ground motion on flexible structures.
Expected Products or Deliverables:
This study is expected to show the extent of potential underestimation of response spectra with the use of observed ground motion and the effects of source information such as rupture pattern, slip distribution, and fault directivity on response spectra. Consequently, the earthquake-resistant capability of flexible structures, particularly base-isolated ones, to a near-field ground motion can be known. Moreover, seismic responses of realistic bridges to the simulated near-field Loma Prieta-type earthquake ground motions will be carried out.

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