1. Project Manager, KOLIN Construction Co., Horasan Sok. No. 24, G.O.P. Ankara, Turkey.
2. Professor, Dept. of Civil Engineering, Istanbul Technical Univ., 80626 Maslak, Istanbul, Turkey.
3. Professor, Dept. of Civil Engineering, Istanbul Tech. Univ., 80626 Maslak, Istanbul, Turkey (corresponding author).