First and Second Order Dynamic Subgrade Models for Soil-Pile Interaction Analysis

by Toyoaki Nogami, Univ of California at San Diego, La Jolla, United States,
Jiang-Xiong Zhu, Univ of California at San Diego, La Jolla, United States,
Takayoshi Ito, Univ of California at San Diego, La Jolla, United States,



Document Type: Proceeding Paper

Part of: Piles Under Dynamic Loads

Abstract: The three-dimensional continuum solutions are used to examine the physical insight of a first order dynamic subgrade model, originally applied by Novak for dynamic pile response analysis. These solutions logically explain the reason why this model is a good approximation for frequencies above the fundamental natural frequency of the soil medium but a poor approximation below this frequency. Ground motions at low frequencies often significantly affect the earthquake responses of very flexible structures. Therefore, this first order model may not be applicable in such a case. In order to improve the situation, a second order model is proposed for the dynamic response analysis of pile foundations. The proposed model is found to perform well for all frequencies including the static condition. Its behavior in response to dynamic loading is discussed.

Subject Headings: Dynamic models | Dynamic loads | Subgrades | Dynamic response | Pile foundations | Mathematical models | Soil-pile interaction

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