ORCID Identifier(s)


Graduation Semester and Year




Document Type


Degree Name

Master of Science in Civil Engineering


Civil Engineering

First Advisor

Raad Azzawi


This study aims to investigate numerically, the effect of anchor groups on concrete breakout strength using nonlinear finite element analysis. Steel headed studs were cast in place within concrete of different amounts of steel fibers. Different proportions of steel fibers (0%, 0.5%, 1%, 1.5%) were utilized within steel fiber reinforced concrete (SFRC) for the numerical simulation. The physical properties of SFRC were modelled with respect to its composite compressive and tensile strength obtained from the experiments. The analysis was conducted on the concrete breakout strength of anchor bolts within SFRC. A good agreement was achieved between the numerical and the experimental results. The numerical results show that the concrete breakout cone radius decreases, and the concrete breakout strength increases as the percentage of steel fiber in the mix increases. The increase in the breakout strength with respect to plain concrete was around 47%, 84%, and 92% as the steel fiber percentage increased to 0.5%, 1% and 1.5% respectively. The grouping effect of anchors was quantified by conducting a numerical analysis on the concrete breakout strength of single anchor under uniaxial tensile loading. A grouping effect factor was found out, which signifies the percentage of load required to break out a concrete cone when the grouping effect takes place. The numerical analysis found out that the grouping effect factor is 0.8, 0.82, 0.84, 0.84 for SFRC 0%, 0.5%, 1%, 1.5% respectively. A parametric study was carried out, understand the effects of anchor bolt embedded length and its diameter n the concrete breakout strength. The nonlinear finite element analysis shows that increasing the embedded length of the anchor bolt from 2.5” to 3.5” increases the breakout strength by 25%, 26.6%, 26.7% and 26.5% for SFRC 0%, 0.5%, 1%, 1.5% respectively.


SFRC, Anchor bolts, Concrete breakout, Nonlinear finite element analysis


Civil and Environmental Engineering | Civil Engineering | Engineering


Degree granted by The University of Texas at Arlington