1. Research Engineer, Federal Highway Administration, Office of Infrastructures R&D, 6300 Georgetown Pike, McLean, VA 22101.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Clarkson Univ., Potsdam, NY 13699-5710 (corresponding author).
3. Ph.D. Student, Dept. of Civil and Environmental Engineering, Clarkson Univ., Potsdam, NY 13699-5710.
4. Professor, Dept. of Civil Engineering, Steinman Hall T-121, City College of the City Univ. of New York, Convent Ave. at 140th St., New York, NY 10031.