CSMIP 92-01

"Evaluation of Soil-Structure Interaction in Buildings during Earthquakes"

by G. Fenves and G. Serino

June 1992, 57 pp.

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A large number of analytical studies of dynamic interaction between buildings and the supporting soil have been performed using a variety of sophisticated techniques. There has, however, been limited evaluation of soil-structure interaction from building response data recorded during moderate and strong earthquakes. This report presents an evaluation of soil-structure interaction effects in a multistory building from the response obtained by the California Strong Motion Instrumentation Program (CSMIP) in the 1 October 1987 Whittier earthquake.

The building, a fourteen story reinforced concrete warehouse, has been the subject of previous investigations of soil-structure interaction using data from several earthquakes. The building response in the 1987 Whittier earthquake is the strongest to date and it provides an excellent opportunity for investigation of soil-structure interaction effects.

A mathematical model of the complete building-foundation-soil system is developed to determine response quantities not directly available from the records and to ascertain the effects of interaction. The model is calibrated using the dynamic properties of the building as determined from the processed records. The model is then used to evaluate the effects of soil-structure interaction on the maximum base shear force, overturning moment and displacement for the building in the 1987 Whittier earthquake. The analysis demonstrates that soil-structure interaction has a significant effect on the base forces and roof displacement in the longitudinal direction of the building compared to the typical assumption in which interaction would be neglected. Soil-structure has less effect on the transverse response of the building. The effects of soil-structure interaction for this building and earthquake is approximately represented by proposed building code provisions.