1. Research Associate, Structural Engineering Research Centre, International Institute of Earthquake Engineering and Seismology, 193953913 Tehran, Iran.
2. Senior Lecturer (Associate Professor), Dept. of Civil and Structural Engineering, Univ. of Sheffield, Sheffield S10 3JD, U.K. (corresponding author).
3. Associate Professor, Structural Engineering Research Centre, International Institute of Earthquake Engineering and Seismology, 193953913 Tehran, Iran.
4. Assistant Professor, Dept. of Civil Engineering, Pardis Branch, Islamic Azad Univ., 16555135 Tehran, Iran.