Partial Loss of Support and Frame‐Soil Interaction
Publication: Journal of Structural Engineering
Volume 113, Issue 12
Abstract
An interaction analysis has been conducted to study the effects of a local loss of support beneath the beam footing of a two‐bay plane frame. The results of the study indicate that the magnitude of increase in the bending moment and axial force in the structure due to the presence of a void are dependent, not only on the extent of support loss, but also on the relative stiffnesses between foundation beam and soil, and between superstructure and soil. The increase in bending moment even for a void span of 1/12 of the foundation beam length can become so significant as to exceed the safety provisions. The study shows that the effect of a void on the superstructure moments can be greatly minimized by a combination of rigid foundation and flexible superstructure.
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References
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Brown, P. T., and Yu, K. R. (1986). “Load sequence and structure‐foundation interaction.” J. Struct. Div., ASCE, 112(3), 481–488.
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Richart, F. E., and Zia, P. (1962). “Effect of local loss of support on foundation design.” J. Soil Mech. and Found. Div., ASCE, 88(SM1), 1–12.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 113 • Issue 12 • December 1987
Pages: 2488 - 2499
Copyright
Copyright © 1987 ASCE.
History
Published online: Dec 1, 1987
Published in print: Dec 1987
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