Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Freyne, Seamus F.

Committee Member

Heard, William F.

Committee Member

Gullett, Phillip M.

Date of Degree

11-25-2020

Document Type

Graduate Thesis - Open Access

Major

Civil and Environmental Engineering

Degree Name

Master of Science

College

James Worth Bagley College of Engineering

Department

Department of Civil and Environmental Engineering

Abstract

Simplified mechanical loading paths, which represent more complex loading paths observed during penetration, were investigated using a triaxial chamber and a high-strength concrete. Objectives were to determine the effects that stress/strain (load) paths had on the material’s unconfined (UC) residual strength. The loading paths included hydrostatic compression (HC), uniaxial strain in compression (UX), and uniaxial strain load biaxial strain unload (UXBX). The experiments indicate that load paths associated with non-visible microstructural damage were HC and UX, which produced minimal impact on the residual UC strength (<30%), while the load paths associated with visible macro-structural damage were UXBX, which significantly reduced the UC strength (>90%). The simplified loading paths were also investigated using a material model driver code that was fit to a widely used Department of Defense material model. Virtual experiment data revealed that the material model investigated overestimated material damage and produced poor results when compared to experimental data.

URI

https://hdl.handle.net/11668/20843

Comments

High-Strength Concrete||Triaxial Compression||Residual Strength||Concrete Damage

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