1. Assistant Professor, Civil Engineering Dept., Islamic Azad Univ., Clalous Branch, P.O. Box 14155-3963, Chalous, Iran (corresponding author).
2. Professor, Civil Engineering Dept., Sharif Univ. of Technology, Tehran, Iran.
3. Professor Emeritus, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Kansas, Lawrence, KS 66045.