1. Assistant Professor, Faculty of Civil Engineering, Division of Structural Engineering, Yildiz Technical Univ., 34349 Beşiktaş, İstanbul, Turkey.
2. Professor, Dept. of Civil Engineering, Boğaziçi Univ., 34342 Bebek, İstanbul, Turkey.
3. Research Assistant, Faculty of Civil Engineering, Yildiz Technical Univ., 34349 Beşiktaş, İstanbul, Turkey.