Structure-Ground Interaction in Earthquakes

by Johann H. Rainer, (A.M.ASCE), Bldg. Physics Section, Div. of Bldg. Res., Natl. Res. Council of Canada, Ottawa, Canada,


Serial Information: Journal of the Engineering Mechanics Division, 1971, Vol. 97, Issue 5, Pg. 1431-1450


Document Type: Journal Paper

Abstract: A method of analysis is presented for determining elastic structure-ground interaction effects of single-story structures under earthquake loads. The method derives an equivalent SDF model for the relative story displacement, incorporating the effects of horizontal and rotational base flexibility in a structure. The equivalent SDF model then permits the determination of the seismic interaction response directly from established or assumed response spectra, or from response calculations of ordinary SDF systems. Sample calculations are presented showing responses for the interaction system, the equivalent SDF model, and a SDF system with the same natural frequency as the interaction structure. A study of a wide range of parameters under earthquake-type disturbances establishes that, for the interaction systems considered, interstory displacements are reduced in relation to a SDF system with identical fundamental frequency and interstory damping.

Subject Headings: Earthquakes | Elastic analysis | Earthquake resistant structures | Structural models | Displacement (mechanics) | Low-rise buildings | Seismic loads

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