1. Professor, School of Civil Engineering, Iran Univ. of Science & Technology (IUST), Narmak, Iran (corresponding author).
2. Ph.D. Candidate, School of Civil Engineering, Iran Univ. of Science & Technology (IUST), Narmak, Tehran, Iran.
3. Professor, Dept. of Civil Engineering, National Central Univ. (NCU), Zhongli, Taoyuan, Taiwan.
4. Assistant Professor, School of Civil Engineering, Iran Univ. of Science & Technology (IUST), Narmak, Iran.