Date of Award

Summer 2016

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Civil/Environmental Engineering

Committee Director

Reza Moradi

Committee Member

Isao Ishibashi

Committee Member

Duc T. Nguyen

Abstract

Mat foundation is used mostly for high-rise buildings and, since the demand for high- rise buildings is growing, having extensive understanding of mat foundation behavior leads us into more efficient structural design. Mat foundation behaviors are affected mostly by soil’s materials properties, foundation size, and thickness and loading conditions. In this study, the sensitivity of mat foundation structural responses to some of the design parameters are evaluated. Sobol decomposition, which is a variance-based technique, is used to perform the global sensitivity analysis. In this study, Patran, a finite element-based software, is used for modeling and simulations.

Approximate flexible method is a basic method which is used to calculate the structural response of a mat foundation. In this study, the responses of the mat foundation are verified by regenerating the ACIC 336 figure, which is used in approximate flexible method. After verification of Patran model responses, the global sensitivity analyses are performed.

“Modulus of elasticity of soil”, “Modulus of elasticity of foundation material”, “Column load”, “Foundation aspect ratio”, and “Foundation thickness” are used as the input variables and “Maximum deflection of the mat foundation” is used as the output response. The results show how the foundation deflection is affected by the design variables.

“Modulus of elasticity of soil”, “Modules of elasticity of foundation material” and “Column load” are used as the input variables and “Maximum deflection of the Mat foundation” is used as the output response. The results show that Maximum deflection of the Mat foundation is sensitive to “Modulus of elasticity of soil”, “Column load” and “Modules of elasticity of foundation material” from the most to the least.

ISBN

9781369170047

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