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Analytical Modeling for Soil-Structure Interaction of a 6-Story Commercial Office Building.


pdf icon Analytical Modeling for Soil-Structure Interaction of a 6-Story Commercial Office Building. (531 K)
Phan, L. T.; Hendrickson, E. M.; Marshall, R. D.; Celebi, M.

Earthquake Engineering Research Institute. Earthquake Awareness and Mitigation Across the Nation. U.S. National Conference, Fifth (5th). Proceedings. Volume 1. July 10-14, 1994, Chicago, IL, 199-208 pp, 1994.

Keywords:

office buildings; commercial buildings; earthquakes; computer models; vibration; structural response; instruments; dynamic characteristics

Abstract:

Strong-motion and ambient vibration data obtained from a 6-story commercial office building in San Bruno, California, were analyzed. Comparison of dynamic characteristics revealed that the first-mode response frequency deduced from the Loma Prieta earthquake records is significantly lower than that deduced from ambient vibration data, and the damping ratio for strong motion is higher than that obtained from ambient vibration. A computer model of the building was developed and analyzed using two boundary conditions. The fixed-base condition was used to simulate the building response to ambient vibration, and the spring-supported condition was used to incorporate soil-structure interaction and thus simulate realistic building response to the Loma Prieta earthquake. Results of analyses showed that the first-mode response frequencies for the two cases differ by essentially the same factor observed from measurements. This suggests that the difference in first-mode response frequencies between ambient vibration and strong motion in this building was due largely to soil-structure interaction.