Haiying Niu

Publication Date

1997

Document Type

Dissertation/Thesis

First Advisor

Majumdar, Pradip, 1954-

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Mechanical Engineering

LCSH

Porous materials--Thermal properties; Finite elements method; Porous materials--Moisture

Abstract

Porous materials such as concrete contain large amounts of water in various forms. High temperature and /or other severe thermal conditions cause release and evaporation of significant amounts of water, inducing pore pressure and temperature gradients under which water is transported through pores. The induced pore pressure, the thermal stress due to temperature gradient, and shrinkage stress due to the release and migration of water may cause high tensile stress resulting in cracks and explosive spalling of structures. An explicit time integration finite element model is developed and implemented into a finite element program. A parametric study is carried out to conduct finite element mesh size and the associated errors. The comparison of calculations of pore pressure, temperature, free water, and released bound water between explicit and implicit integration methods is presented. The pore pressure, temperature, and moisture transport within an intensely heated concrete slab are simulated by using a computer program of finite element analysis.

Comments

Includes bibliographical references (leaf [49])

Extent

xi, 94 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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