1. Assistant Processor, Dept. of Civil Engineering, Yıldız Technical Univ., İstanbul 34220, Turkey (corresponding author).
2. Assistant Processor, Dept. of Civil Engineering, Karadeniz Technical Univ., Trabzon 61080, Turkey.
3. Professor, Dept. of Civil Engineering, Karadeniz Technical Univ., Trabzon 61080, Turkey.