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

Authors: H.M. Rajashekhar Swamy; Krishnamoorthy; D.L. Prabakhara; S.S. Bhavikatti

Addresses: Department of Civil Engineering, Sahyadri College of Engineering and Management, Addyar, NH-48, Mangalore-575007, Karnataka (State), India ' Department of Civil Engineering, Manipal Institute of Technology, Manipal-576 104, Karnataka, India ' Sahyadri College of Engineering and Management, Addyar, NH-48, Mangalore-575007, Karnataka (State), India ' Department of Civil Engineering, BVB College of Engineering and Technology, Hubli-580031, India

Abstract: 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.

DOI: 10.1504/IJSTRUCTE.2013.055187

International Journal of Structural Engineering, 2013 Vol.4 No.3, pp.187 - 233

Available online: 22 Jul 2013 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article