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Instability Inducing Potential of Near Fault Ground Motions

by Dionisio Bernal, Arash Nasseri and Yalcin Bulut

Bernal, Dionisio, Arash Nasseri and Yalcin Bulut (2006). Instability Inducing Potential of Near Fault Ground Motions SMIP06 Seminar on Utilization of Strong-Motion Data, p. 41 - 62.

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Abstract

Gravity imposes a lower bound on the strength needed for stable response. Collapse spectra are plots of this strength vs. period for constant values of a parameter that characterizes gravity. The paper contains formulas for collapse spectral ordinates for near fault conditions and shows that the collapse mechanism in buildings is not statistically dependent on whether the excitation is near fault or far field. Safety against instability can be predicted using the provided expressions and results from a pushover analysis. The near fault condition is not found to be a critical consideration from an instability perspective.