1. Professor, Dept. of Civil and Environmental Engineering, City College of the City Univ. of New York, New York, NY 10031.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Missouri, 2502 Lafferre Hall, Columbia, MO 65211.
3. Engineering Consultant, 9 Stedman Way, Loudonville, NY 12211; retired, New York State DOT, 50 Wolf Rd., Albany, NY 12232.
4. Graduate Student, Dept. of Civil and Environmental Engineering, City College of the City Univ. of New York, New York, NY 10031.
5. Associate Professor, College of Civil Engineering, Hunan Univ., Changsha 410082, China (corresponding author).