Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.469819
Title: Interaction between foundations and structures
Author: Rahman, M. A.
Awarding Body: University of Aston in Birmingham
Current Institution: Aston University
Date of Award: 1978
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Abstract:
The thesis considers the interaction between complete structures and their supporting soil. The finite element method is applied and computer programs are developed for the three dimensional non-linear analysis of the superstructure, the foundation and the soil as an integral system. The non-linear properties of the soil are determined from triaxial tests and represented by a set of graphs of octahedral shear stress and strain. These are mathematically formulated in terms of the cubic spline functions and followed by an incremental analysis technique. When the longterm settlements of soils such as clay are given by Terzaghi's consolidation theory, an iterative method of analysis is proposed. Tensile separations at the foundation-soil interface and within the soil mass are represented by incorporating dummy joints in the mesh and activating them to introduce a physical crack. The data preparation for the computer programs is largely automated so that they can be used with a minimum of manual effort and without a knowledge of the details of the analytical method. Two methods of the construction of the overall stiffness matrix which require little or no core storage are presented. Economy in the computer time is achieved by formulating the element stiffness matrices in terms of explicit expressions. A comparison of the cost of the analysis and the size of the problem is presented. The results of a series of experiments on the models of two space frames, a box culvert and a tall structure resting on a bed of sand are reported and compared with the analytical results. Two large practical structures and their supporting soil are analysed and their interactive behaviours are investigated.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.469819  DOI: Not available
Keywords: Civil Engineering
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