1. Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of North Carolina at Charlotte, 9201 University City Blvd., EPIC Bldg., Charlotte, NC 28223-0001.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of North Carolina at Charlotte, 9201 University City Blvd., EPIC Bldg., Suite 3164, Charlotte, NC 28223-0001 (corresponding author).