1. Assistant Professor of Civil Engineering, Sakarya Univ., Muh. Fak. Ins. Muh. Bol., Sakarya 54187, Turkey.
2. University Distinguished Professor, Dept. of Civil and Environmental Engineering, Virginia Polytechnic Institute, Blacksburg, VA 24061-0105.
3. Emeritus Professor, Dept. of Civil and Environmental Engineering, Virginia Polytechnic Institute, Blacksburg, VA 24061-0105.