1. Ph.D. Candidate, Dept. of Civil Engineering, Univ. of Tabriz, 51666 Tabriz, Iran (corresponding author).
2. Professor, Dept. of Civil Engineering, Isfahan Univ. of Technology, Isfahan, Iran; presently, Invited Professor and Research Scholar, Univ. of California, Irvine, CA 92697.
3. Associate Professor, Dept. of Civil Engineering, Univ. of Tabriz, 51666 Tabriz, Iran.