1. Doctoral Student, Dept. of Civil and Environmental Engineering, Univ. of Alabama, Huntsville, AL 35899.
2. Professor of Civil Engineering, Dept. of Civil and Environmental Engineering, Univ. of Alabama, Huntsville, AL 35899 (corresponding author).
3. Professor of Mechanical Engineering, Dept. of Mechanical and Aerospace Engineering, Univ. of Alabama, Huntsville, AL 35899.
4. Doctoral Student, Dept. of Mechanical and Aerospace Engineering, Univ. of Alabama, Huntsville, AL 35899.