1. Department of Civil, Construction, & Environmental Engineering, North Carolina State Univ., Campus Box 7908, Raleigh, NC 27695-7908 US, e-mail: dkim15@ncsu.edu
2. Department of Civil, Construction, & Environmental Engineering, North Carolina State Univ., Campus Box 7908, Raleigh, NC 27695-7908 US, e-mail: kim@ncsu.edu