Comparison of Seismic Collapse Risk of Structures by Considering Four Different NGA-West2 Ground Motion Prediction Equations

Session: Earthquake Ground Motion and Impacts [Poster]
Type: Poster
Date: 4/30/2020
Time: 08:00 AM
Room: Ballroom
Description: 

Engineers and seismologists are required to appropriately select ground motions for use in nonlinear dynamic analyses to assess the collapse capacity of structures. It has been shown that selecting ground motions with proper spectral shape (proper ε) increases seismic collapse capacity of structures. Epsilon, as a difference between the spectral acceleration of a record and the mean value obtained from a ground motion prediction model for a given period, has a significant influence on the structural collapse risk assessment. Typically, ground motions that cause collapse are expected to have high-intensity and a large magnitude, and they tend to have a peak spectral shape that should be considered in selecting ground motions. There are few methods to account for the effect of spectral shape in assessing the collapse risk of structures. The most straightforward method is to select ground motions that are specific to the first mode period of structure and the site hazard characteristics. Another alternative simplified method uses a general set of ground motions for collapse estimation for any structure without need to consider a specific set of ground motion for each building. In this study, we consider four different Ground Motion Prediction Equations (GMPEs) that produce different spectral shape at specific period of buildings and assess collapse risk based on these two methods and examine whether the results obtained for collapse risk of structures based on these GMPEs show good agreement with each other or not.

Presenting Author: Mohsen Akhani Senejani

Authors