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.