1. Gradaute Research Assistant, Dept. of Civil Engineering and Mechanics, College of Engineering & Applied Science, Univ. of Wisconsin, Milwaukee, WI 53217, US.
2. Undergraduate Research Assistant, Dept. of Civil Engineering and Mechanics, College of Engineering & Applied Science, Univ. of Wisconsin, Milwaukee, WI 53217, US.
3. Assistant Professor, Dept. of Civil Engineering and Mechanics, College of Engineering & Applied Science, Univ. of Wisconsin, Milwaukee, WI 53217, US (Corresponding author), e-mail: elhajjar@uwm.edu