Location
San Diego, California
Presentation Date
26 May 2010, 4:45 pm - 6:45 pm
Abstract
Lateral load induced in piles (both long and short) under earthquake is a problem of serious complexity that has been plaguing professional engineers and researchers alike for quite some time. The practice in vogue is to ensure that fixed base shear of the column does not exceed static shear load capacity of the piles. Inertial and stiffness effects of pile are usually ignored in dynamic earthquake analysis. The present paper proposes a method where, based on modal response or time history analysis, load on short piles may be estimated under earthquake considering its stiffness, inertia, effect of material and geometric damping properties. The results are compared with the conventional methods. Effect of partial embedment, a situation that may develop under soil liquefaction during earthquake has also been derived. Pile loads are estimated for two cases: a) When the structure is a lumped mass system having infinite stiffness: like a machine foundation or a heavy short vessel supported directly on the pile cap. b) Superstructure has finite stiffness and mass like a frame (building /pipe rack etc) The paper assumes that for all cases when slenderness ratio L/r is less than 20 the pile behaves as short pile when failure or yielding of soil precedes the structural failure of the pile. The major advantage with this method is that it does not warrant a sophisticated software to be developed for the analysis. A simple spread sheet is sufficient to produce an accurate result.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
5th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2010 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Chowdhury, Indrajit and Dasgupta, Shambhu P., "Estimation of Lateral Load Capacity of Short Piles Under Earthquake Force" (2010). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 20.
https://scholarsmine.mst.edu/icrageesd/05icrageesd/session05/20
Included in
Estimation of Lateral Load Capacity of Short Piles Under Earthquake Force
San Diego, California
Lateral load induced in piles (both long and short) under earthquake is a problem of serious complexity that has been plaguing professional engineers and researchers alike for quite some time. The practice in vogue is to ensure that fixed base shear of the column does not exceed static shear load capacity of the piles. Inertial and stiffness effects of pile are usually ignored in dynamic earthquake analysis. The present paper proposes a method where, based on modal response or time history analysis, load on short piles may be estimated under earthquake considering its stiffness, inertia, effect of material and geometric damping properties. The results are compared with the conventional methods. Effect of partial embedment, a situation that may develop under soil liquefaction during earthquake has also been derived. Pile loads are estimated for two cases: a) When the structure is a lumped mass system having infinite stiffness: like a machine foundation or a heavy short vessel supported directly on the pile cap. b) Superstructure has finite stiffness and mass like a frame (building /pipe rack etc) The paper assumes that for all cases when slenderness ratio L/r is less than 20 the pile behaves as short pile when failure or yielding of soil precedes the structural failure of the pile. The major advantage with this method is that it does not warrant a sophisticated software to be developed for the analysis. A simple spread sheet is sufficient to produce an accurate result.
