E. Safak et A. Frankel, STRUCTURAL RESPONSE TO 3D SIMULATED EARTHQUAKE MOTIONS IN SAN-BERNARDINO-VALLEY, Journal of structural engineering, 120(10), 1994, pp. 2820-2839
Citations number
14
Categorie Soggetti
Engineering, Civil","Construcion & Building Technology
Structural response to one- and three-dimensional (3D) simulated motio
ns in San Bernardino Valley, Calif., from a hypothetical earthquake al
ong the San Andreas Fault with moment magnitude 6.5 and rupture length
of 30 km (18.6 mi) is investigated. For three stations that are close
to each other and to the fault line, various measures of ground motio
ns (e.g., peak values, intensities, durations, and effective frequency
bands), elastic and elastoplastic response spectra, and the response
of a 10-story, three-bay frame are calculated. Because the simulation
results are reliable up to 1 Hz, only long-period structures, with per
iods of 1 to 10 sec, are considered. The results show that the ground
motions and the structural response vary dramatically with the type of
simulation and the location. In general, one-dimensional (1D) simulat
ions underestimated the response and resulted in values as low as one-
fifth of those of 3D simulations. The difference in the structural res
ponse at three stations was found to be as high as a factor of six. Th
e reasons for such large differences are the trapping of seismic waves
in the basin and the constructive interference of surface waves trave
ling in different directions, none of which can be accounted for by 1D
models, and the strong influence of source directivity.