Scaling Ground Motions for Performance Assessment of Tall Building
Date Issued
2012
Date
2012
Author(s)
VIET DUNG, HA
Abstract
Next generation performance-based earthquake engineering involves the use of a probability framework, which incorporates the inherent uncertainty and variability in seismic hazard, structural and non-structural responses, damage states and economic and casualty losses. One key issue in seismic performance assessment is the scaling of ground motions for nonlinear response-history analysis. This research is in the second phase of a project, which investigates the impact of ground-motion scaling procedures on the distributions of structural responses for tall buildings. In the previous phase of the project, four ground-motions scaling procedures were studied, namely: 1) geometric-mean scaling of pairs of ground motions, 2) spectrum matching, 3) first-mode-based scaling to a target spectral acceleration, and 4) maximum-minimum orientation scaling. In this thesis, three more scaling procedures are investigated, including: modal-pushover-based scaling, distribution-based scaling and Jayaram and Baker’s scaling methods. Nonlinear response-history analyses are conducted to study the distributions of peak floor acceleration, peak story drift and floor spectral acceleration responses of a sample 34-story high-rise building subjected to ground motions scaled using the three methods. The advantages and disadvantages of each method and the impact of scaling on the seismic performance of tall buildings are discussed.
Subjects
ground motions
scaling
seismic performance assessment
high-rise building
pushover
Type
thesis
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