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Comparison of linear and non–linear, space frame–raft–soil interaction analyses, by using finite element method

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The objective of the present study is to estimate the realistic displacements and force quantities in the structural members, accounting for their three dimensional behaviour and non–linear constitutive relations of soil. This demands usage of proper constitutive model for soil and its numerical model, which is validated experimentally. A program has been developed in the present work to compare soil–structure interaction analyses of a three dimensional frame resting on mat foundation for linear and non–linear constitutive relations of soil. For linear analysis initial tangent modulus is used. For non–linear analysis hypoelasticity model is adopted. This hypoelastic model, used, is validated for a plate load test. Results of non–linear analysis are compared with non–interactive analysis and linear analysis to establish its worthiness.

Keywords: soil–structure interaction, nonlinear analysis, raft foundation, hypoelasticity modelling, 3D analysis, structural engineering, finite element method, FEM, displacement, force, structural members, nonlinear constitutive relations, soil

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