Analytical Modeling for Soil-Structure Interaction of a 6-Story Commercial Office Building.
Analytical Modeling for Soil-Structure Interaction of a
6-Story Commercial Office Building.
Phan, L. T.; Hendrickson, E. M.; Marshall, R. D.;
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.
office buildings; commercial buildings; earthquakes;
computer models; vibration; structural response;
instruments; dynamic characteristics
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.