A New Amplitude-Modulating Function and its Statistical Parameters for Seismic Ground Motion Simulation

by A. T. Y. Tung, San Jose Univ, San Jose, United States,
J. N. Wang, San Jose Univ, San Jose, United States,
A. S. Kiremidjian, San Jose Univ, San Jose, United States,

Abstract: This paper presents a new energy-based amplitude-modulating function and its statistics-based parameters for earthquake ground motion simulation. This function overcomes the main shortcomings of the existing modulating functions, i.e., the dependency of the functions on strong motion duration; the lack of statistical characterization of the function parameters; and the inaccuracy in modeling the seismic energy arrival. The two parameters, α and β, of the proposed modulating function are determined through the use of a normalized expected cumulative energy function. Statistical characterization of the modulating function parameters was conducted using an ensemble of 72 accelerograms from the October 1, 1987, Whittier Narrows earthquake. Correlations between the function parameters and the various strong ground motion properties were investigated. The proposed amplitude- modulating function was incorporated into the generation of synthetic strong ground motions for illustration and verification purposes.

Subject Headings: Ground motion | Parameters (statistics) | Earthquakes | Seismic tests | Seismic effects | Correlation | Verification | Load and resistance factor design

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