1. Graduate Research Assistant, School of Civil Engineering, Iran Univ. of Science and Technology, P.O. Box 16765-163, Narmak, 16846 Tehran, Iran (corresponding author).
2. Research Associate, School of Civil Engineering, Iran Univ. of Science and Technology, P.O. Box 16765-163, Narmak, 16846 Tehran, Iran.
3. Professor, Center of Excellence for Fundamental Studies in Structural Engineering, School of Civil Engineering, Iran Univ. of Science and Technology, Tehran, Iran.