1. Assistant Professor, Dept. of Civil Engineering, Univ. of Uludağ, Nilüfer-Bursa 16059, Turkey (corresponding author).
2. Associate Professor, Dept. of Civil Engineering, Univ. of Dokuz Eylul, Buca-Izmir 35220, Turkey.
3. Professor, Dept. of Civil Engineering, Univ. of Ege, Bornova-Izmir 35040, Turkey.