1. M.Sc. Graduate Student in Structural Engineering, Dept. of Civil Engineering, Semnan Univ., 35131-19111 Semnan, Iran.
2. Associate Professor, Dept. of Civil Engineering, Semnan Univ., 35131-19111 Semnan, Iran (corresponding author).
3. Professor, Dept. of Civil Engineering, Semnan Univ., 35131-19111 Semnan, Iran.