1. Associate Professor, Dept. of Civil Engineering, The Univ. of Toledo, Toledo, OH 43606 (corresponding author).
2. Ph.D. Student, Dept. of Civil Engineering, Bogazici Univ., 34342 Bebek, Istanbul, Turkey.
3. Assistant Professor, Dept. of Civil Engineering, Bogazici Univ., 34342 Bebek, Istanbul, Turkey.