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SOIL STRUCTURE INTERACTION OYTUN İNCİ EQE 590 - Soil Dynamics and Earthquake Response Analysis
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CONTENT SOIL STRUCTURE INTERACTION 1- Introduction 2- Approaches for modelling soil medium i) Winkler model ii) Elastic Continuum Model 3- Stiffness for shallow foundations i) Winkler model 4- Stiffness for deep foundations i) Winkler model ii) P-Y, t-z, Q-z model
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INTRODUCTION SOIL STRUCTURE INTERACTION The behavior of structures based on compliant soils and subjected to dynamic actions depend on the soil and foundation properties. The process that the response of the soil influences the motion of the structure and the response of the structure influences the motion of the soil is called Soil Structure Interaction . There are two primary issues related to the mechanisms of interaction between the structure and foundation: Inertial Interaction: Displacements of the foundation differs relative to the free-field due to inertia developed in the structure because of the structures’ vibrations which gives rise to base shear and moment. Kinematic Interaction: The presence of stiff foundation elements on or in soil will cause foundation motions to deviate from free-field motions.
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APPROACHES FOR MODELLING SOIL MEDIUM SOIL STRUCTURE INTERACTION Winkler model Soil is represented by a no of identical but mutually independent, closely spaced, discrete, linearly elastic springs. According to Winkler model idealization, deformation of foundation due to applied load is confined to the loaded region only. Elastic continuum model The physical representation of the infinite soil media or the elastic half space will generate an elastic continuum model. A semi-infinite, homogeneous, isotropic, linear elastic solid subjected to a concentrated force acting normal to the plane boundary will represent such model. It has also the important advantage of simplicity of the input parameters, modulus of elasticity and Poisson’s ratio.
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SHALLOW FOUNDATION SOIL STRUCTURE INTERACTION Winkler Methods to establish the foundation stiffness for shallow foundations: Method 1 For shallow bearing footings that are rigid with respect to the supporting soil an uncoupled spring model will represent the foundation stiffness. In the Method 1, either fix base assumption is made and bilinear elastic load deformation relationship is used to find the deformations; or the stiffness parameters in the table below, if the foundation is modelled in the analysis.
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SOIL STRUCTURE INTERACTION SHALLOW FOUNDATION Stiffness depends on the foundation geometry, shear modulus and poisson’s ratio.
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SOIL STRUCTURE INTERACTION Method 2: For shallow bearing foundations that are not rigid with respect to the supporting soils, a finite element representation of linear or nonlinear foundation behavior using Winkler models shall be used. This method is recommended for nonlinear procedures and also anticipated for linear procedures.
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