Rigid Spread Footings Resting on Soil Subjected to Axial Load and Biaxial Bending. II: Design Aids
Publication: International Journal of Geomechanics
Volume 13, Issue 2
Abstract
Design aids (nomograms) for rectangular and symmetrical trapezoidal rigid spread footings are developed using a method previously developed by the writers in a companion paper. The nomograms can be used by designers to directly determine their maximum axial load and biaxial moment capacities without exceeding the bearing capacity of the supporting soil. Three different types of pressure distribution at the soil-footing interface are considered: uniform, linear, and parabolic. The results obtained can then be compared with the biaxial moment-axial load interaction diagrams of the attached concrete walls or columns. This allows the structural designer to determine the vulnerability and likelihood of exceeding the bearing capacity of the supporting soil. Four examples are presented that show the effectiveness and simplicity of the proposed nomograms in the analysis of isolated rectangular and trapezoidal rigid spread footings resting on soil.
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Acknowledgments
The research presented in this paper was carried out at the National University of Colombia, School of Mines at Medellín. The writers want to express their appreciation to DIME for the financial support and to Dr. J. Paul Smith-Pardo and Mauricio Areiza-Hurtado, members of the Structural Stability Group of the National University of Colombia, for their suggestions.
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 13 • Issue 2 • April 2013
Pages: 120 - 131
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jul 21, 2011
Accepted: Jan 30, 2012
Published online: Feb 2, 2012
Published in print: Apr 1, 2013
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