1. Associate Professor, Dept. of Civil Engineering, Gümüşhane Univ., Gümüşhane 29100, Turkey (corresponding author).
2. Associate Professor, Dept. of Civil Engineering, Gümüşhane Univ., Gümüşhane 29100, Turkey.
3. Dept. of Civil Engineering, Gümüşhane Univ., Gümüşhane 29100, Turkey.