|Title:||A Study of Seismic Ground Motion for Lifeline Response Analysis
|Author(s):||Zerva, A.; Ang, A.H-S.; Wen, Y.K.
|Abstract:||An analytical model for determining the differential ground motion during an earthquake
is developed. The ground motion is assumed to be a stationary random process, resulting
from waves radiated from an underground source (fracture surface). The source motion is
also modeled as a random process specified by a power spectral density. The spectral
density of the ground motion is related to that of the source by a frequency transfer
function. An analytical method for two-dimensional wave propagation is used to evaluate
the displacements at the ground surface, from which the frequency transfer function is
obtained through system identification. Power spectral densities of acceleration, crosscorrelation
and spatial variation coefficients, as well as power spectral densities of
differential acceleration obtained through the model are compared with data from an actual
earthquake, the earthquake of January 29, 1981, recorded at Lotung, Taiwan. The comparison
indicates that the results of the model are in good agreement with the earthquake
Dynamic analyses of lifelines are also performed. The seismic input to the structures is
considered to be either fully or partially correlated, and the results of the analytical
stochastic ground motion model are used. The effect of the spatial variation of ground
motions on the damage and reliability of horizontal systems is evaluated.
|Publisher:||University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign.
|Series/Report:||Civil Engineering Studies SRS-521
|Sponsor:||National Science Foundation Grants INT 82-19528 and CEE 82-13729
|Date Available in IDEALS:||2009-10-30