Location
San Diego, California
Presentation Date
26 May 2010, 4:45 pm - 6:45 pm
Abstract
A new method was proposed in this study to evaluate the natural frequency of a pile-soil system under earthquake loading using a simple mass-spring model. The diagonal, 4x4, mass matrix in the model consisted of concentrated masses of a pile and a superstructure. The flexural stiffness of the pile and the spring stiffness between the pile and the soil were used to construct the stiffness matrix in the model. These two matrices were then input in the frequency equation for calculating the natural frequency of the pile system. The spring stiffness between the pile and the soil, which considerably influences the calculated natural frequency, was evaluated by using the coefficient of subgrade reaction modulus, the p-y curve, and the subsoil elastic modulus. The resulting natural frequencies were compared with those of 1-g shaking table tests. The comparison showed that the method of Reese (1974), which utilizes the coefficient of subgrade reaction modulus, and Yang’s (2009) dynamic p-y backbone curve method calculated the natural frequency of the pile-soil system most accurately. Their results were within 5% of the values obtained from the shaking table tests for the pile system in dry dense sand deposits.
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
Yang, Eui-Kyu; Kwon, Sun-Yong; Choi, Jung-In; and Kim, Myoung Mo, "Natural Frequency Calculation of a Pile-Soil System in Dry Sand Under an Earthquake Loading" (2010). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 34.
https://scholarsmine.mst.edu/icrageesd/05icrageesd/session05/34
Included in
Natural Frequency Calculation of a Pile-Soil System in Dry Sand Under an Earthquake Loading
San Diego, California
A new method was proposed in this study to evaluate the natural frequency of a pile-soil system under earthquake loading using a simple mass-spring model. The diagonal, 4x4, mass matrix in the model consisted of concentrated masses of a pile and a superstructure. The flexural stiffness of the pile and the spring stiffness between the pile and the soil were used to construct the stiffness matrix in the model. These two matrices were then input in the frequency equation for calculating the natural frequency of the pile system. The spring stiffness between the pile and the soil, which considerably influences the calculated natural frequency, was evaluated by using the coefficient of subgrade reaction modulus, the p-y curve, and the subsoil elastic modulus. The resulting natural frequencies were compared with those of 1-g shaking table tests. The comparison showed that the method of Reese (1974), which utilizes the coefficient of subgrade reaction modulus, and Yang’s (2009) dynamic p-y backbone curve method calculated the natural frequency of the pile-soil system most accurately. Their results were within 5% of the values obtained from the shaking table tests for the pile system in dry dense sand deposits.
