1. Member, ASCE
2. Asst. Prof., Dept. of Civ. and Envir. Engrg., New Jersey Inst. of Technol., Newark, NJ 07102. E-mail: chien@megahertz.njit.edu.
3. PhD Candidate, Inst. for Transp., New Jersey Inst. of Technol., Newark, NJ.
4. Asst. Prof., Dept. of Civ. and Envir. Engrg., New Jersey Inst. of Technol., Newark, NJ.