Earthquake Interaction for Multistory Building

by Lawrence W. Fagel, Member of Technical Staff; Bell Laboratories, Whippany, NJ,
Shin-Chi Liu, Member of Technical Staff; Bell Laboratories, Whippany, NJ,

Serial Information: Journal of the Engineering Mechanics Division, 1972, Vol. 98, Issue 4, Pg. 929-945

Document Type: Journal Paper


The earthquake responses of multistory buildings are studied taking into account the soil-structure interaction effects. Fast Fourier transform techniques used to obtain the frequency-domain responses (transfer functions) and time-domain responses (time histories). The results show that the floor accelerations, distortions, and story shears are largest when the dominant frequency of an earthquake accelerogram matches the fundamental frequency of a building and the foundation soil is very stiff. Interaction caused by soil compliance generally reduces all these responses; however, rocking can become significant for heavy buildings founded on very soft soils, thus resulting in large total displacements. The maximum acceleration and story-shear responses within a building are, for practical purposes, independent of soil shear-wave velocities over 1000 fps if the dominant frequency of the earthquake is as high as the second-mode natural frequency of the structure.

Subject Headings: Soil-structure interaction | Earthquakes | Mid-rise buildings | Soft soils | Natural frequency | Soil structures | Fourier analysis | Frequency analysis

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