Graduation Semester and Year

2020

Language

English

Document Type

Thesis

Degree Name

Master of Science in Civil Engineering

Department

Civil Engineering

First Advisor

Raad Azzawi

Abstract

This study investigates the numerical analysis of concrete breakout strength of cast in place anchors in shear within synthetic fiber reinforced concrete (SYN-FRC). A three dimensional, full-scale model was developed using the ABAQUS 6.14 software. The 3D solid elements with consideration of material nonlinearities were chosen to stimulate the SYN-FRC beam anchorage. The numerical analysis was conducted with a fixed loading rate of 300lb per step to obtain the behavior of fiber-reinforced concrete breakout with design-mix compressive strength of 4,000 psi and fiber volume fraction of 0%, 0.5%, 1.0%, and 1.5%. An inverse analysis was used to calibrate the material model defined in the ABAQUS software with experimental data from previous research since fiber reinforced concrete cannot be modeled precisely with the random distribution of fibers in the concrete matrix. Only compression tests and slump tests were performed to testify the results of the tests with the previous experimental data. Since a good agreement between results was observed, the tensile strength, flexure strength, and anchor shear test results for SYN-FRC were directly used to model in ABAQUS. It was discovered that the compressive strength of the concrete decreased as the fiber reinforcement increased, which can contribute to reducing workability and increased air voids from poor consolidation. In contrast, using synthetic fibers leads to an increase in tensile, flexure, and the anchorage capacity of concrete for the cast-in-place anchor loaded in shear. From the numerical analysis, the Modulus of elasticity increased by 2.8%, 5.0%, and 5.1% for the fiber volume fraction of 0.5%, 1.0%, and 1.5%, respectively, in comparison to the empirical computation of Elastic Modulus. Therefore, from numerical analysis, a parametric study was conducted to evaluate the Elastic Modulus for synthetic fiber reinforced concrete by calibrating load-deflection behavior from physical tests.

Keywords

Synthetic Fiber Reinforced Concrete (SYN-FRC), Finite element, Concrete anchorage, Modulus of elasticity, ABAQUS, Numerical analysis

Disciplines

Civil and Environmental Engineering | Civil Engineering | Engineering

Comments

Degree granted by The University of Texas at Arlington

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