Soil, Foundation, and Superstructure Interaction for Plane Two-Bay Frames
Publication: International Journal of Geomechanics
Volume 16, Issue 1
Abstract
Geotechnical analyses are usually made before superstructure members are fully defined. The behavior of long-span buildings differs from the behavior of short-span buildings. Expensive solutions to the differential settlement that is calculated in geotechnical reports may be preferable but do not necessarily consider the superstructure’s rigidity effect. This paper examines the effect of the superstructure’s rigidity on the contact stress and the differential settlement for plane 2-bay frames. The plane frames consisted of flat slabs with hinged or fixed connections to the walls. The foundation system consisted of strip footings without tie beams to connect the footings due to the large span of the frames. The effect of superstructure rigidity on the damping of differential settlement owing to the redistribution of loads was investigated. The use of a slightly rigid superstructure may be the solution to differential settlement without the need for additional, more expensive methods. Five groups with 54 2-bay frames with different rigidities were modeled using a geotechnical finite-element program. The groups represented the main factors that affect the frame-soil system rigidity. No impact of footing rigidity on the average contact stress under the footings or on the maximum settlement was investigated. However, the rigidity of the footings also influences the distribution of the contact stress under the footing itself. The rigidities of the walls and slabs have significant effects on the resultant average contact stresses and on the maximum settlements under the footings, which affect the differential settlements. Analyses charts and new equations are presented to calculate the average contact stress and maximum settlements under the inner and outer footings for plane 2-bay frames. Therefore, the differential settlement can be depicted with consideration given to superstructure rigidity. The new straining actions of the superstructure’s walls also are presented.
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Acknowledgments
The authors express their sincere appreciation to the Soil Structure Interaction Group in Egypt (SSIGE), gratitude to Professor Osman Ramadan for his effort to review this paper, and special thanks to the team at the EHE Consulting Group in Egypt and the United Arab Emirates as well as to the organizing team of the Geo-Hubei 2014 conference, especially Professor Dr. Dar-Hao Chen, for the help and encouragement.
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Published In
International Journal of Geomechanics
Volume 16 • Issue 1 • February 2016
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 18, 2014
Accepted: Sep 15, 2014
Published online: Oct 14, 2014
Published in print: Feb 1, 2016
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