Location

St. Louis, Missouri

Session Start Date

3-11-1991

Session End Date

3-15-1991

Abstract

This paper describes a hybrid method that may be used to model the dynamic responses of multiple rectangular foundations resting on a homogeneous, viscoelastic stratum and excited by harmonic waves. The hybrid analysis described in this paper combines the dynamic stiffness and finite element methods. The method uses equivalent area disk loads for Green's functions at the soil surface. The dynamic stiffness method is used to obtain the stiffness matrix of the soil medium and the finite element method is used to obtain the stiffness matrix of surface foundations. The stiffness of the entire soil-structure system can be obtained using a substructure approach by assembling the stiffnesses of the soil medium and the foundations. The stiffness of the surface foundations affects the dynamic behavior of the soil-foundation system, especially with respect to its vertical motion. The finite element method described in this paper is used to construct the stiffness of the surface foundations. Equivalent area disks are placed at discretized points on the interface between the foundations and stratum surface. The stratum compliance matrix is constructed using the Green functions for vertical and lateral disk loads. Implementation of this model for analyzing soil-foundation system is current underway.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Second Conference

Publisher

University of Missouri--Rolla

Publication Date

3-11-1991

Document Version

Final Version

Rights

© 1991 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 11th, 12:00 AM Mar 15th, 12:00 AM

A Hybrid Model for Soil-Foundation Compliance

St. Louis, Missouri

This paper describes a hybrid method that may be used to model the dynamic responses of multiple rectangular foundations resting on a homogeneous, viscoelastic stratum and excited by harmonic waves. The hybrid analysis described in this paper combines the dynamic stiffness and finite element methods. The method uses equivalent area disk loads for Green's functions at the soil surface. The dynamic stiffness method is used to obtain the stiffness matrix of the soil medium and the finite element method is used to obtain the stiffness matrix of surface foundations. The stiffness of the entire soil-structure system can be obtained using a substructure approach by assembling the stiffnesses of the soil medium and the foundations. The stiffness of the surface foundations affects the dynamic behavior of the soil-foundation system, especially with respect to its vertical motion. The finite element method described in this paper is used to construct the stiffness of the surface foundations. Equivalent area disks are placed at discretized points on the interface between the foundations and stratum surface. The stratum compliance matrix is constructed using the Green functions for vertical and lateral disk loads. Implementation of this model for analyzing soil-foundation system is current underway.