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Earthquake Ground Motion Selection for Time History Analysis of Structures Using an Evolutionary Algorithm

Description: 

This study proposes a biogeography-based algorithm (BBO) for selection of a set of seismic ground motions (GM). Uniform hazard spectrum (UHS) can be selected as the target spectrum. We considered two sites from two different geographical areas in the United States, first site is in Memphis, and second site is in San Francisco. Selected ground motions are subjected to scaling factors that are scalar values within the user-specified range. As a result, there is no alteration to the phase or shape of the response spectra of earthquake ground motions. The proposed method can search a set made up of thousands of earthquake records and recommend a desired subset of records that match the target design spectrum. BBO, which considers the union of 7 or 11 records and appropriate scaling factors, is employed to complete this task. The process is quick and reliable, producing recordings that closely match the target spectrum with the least amount of manipulation and variation from the target spectrum. In Addition, we provided some error measures between target spectrum and the predicted spectrum that is obtained by mean of selected records (7, or 11 records) for both sites. Results indicate that the suggested solution model can be viewed effective for acquiring suitable GM record sets to be used for time history analysis within a probabilistic seismic design.

Session: Numerical Modeling in Seismology: Developments and Applications [Poster]

Type: Poster

Date: 4/20/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Shahram Pezeshk

Student Presenter: No

Invited Presentation: 

Authors