Dynamics of Structures on Two‐Spring Foundation Allowed to Uplift
Publication: Journal of Engineering Mechanics
Volume 110, Issue 7
Abstract
Investigated in this paper is the dynamics of structures with their foundation mat supported only through gravity and thus permitted to uplift from the supporting system. In its fixed base condition the structure is idealized as a single‐degree‐of‐freedom system attached to a rigid foundation mat, which is supported at each edge by a spring‐damper element. Analytical expressions are presented for the free vibration response of the system and the effects of foundation uplift are examined. An effective numerical procedure, based on expressions of the Rayleigh‐Ritz concept, to evaluate the structural response to earthquakes is presented. Based on the response spectra presented it is shown that foundation mat uplift has the effect of reducing the base shear for shortperiod structures, with these reductions being especially significant for the more slender structures.
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References
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also seeEarthquake Engineering and Structural Dynamics, Vol. 11, pp. 57–76 and 501–521, 1983.
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Yim, C. S., and Chopra, A. K., “Effects of Transient Foundation Uplift on Earthquake Response of Structures,” Report No. UCB/EERC 83‐09, Earthquake Engineering Research Center, University of California, Berkeley, Calif., June, 1983.
Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 110 • Issue 7 • July 1984
Pages: 1124 - 1146
Copyright
Copyright © 1984 ASCE.
History
Published online: Jul 1, 1984
Published in print: Jul 1984
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