1. Professor, School of Civil and Environmental Engineering, Amirkabir Univ. (Tehran Polytechnic), Tehran, Iran. E-mail: karamouz@aut.ac.ir
2. Lecturer, Faculty of Engineering, Univ. of Tehran, Tehran, Iran. E-mail: kerachian@ut.ac.ir
3. Assistant Professor, Faculty of Engineering, Univ. of Tehran, Iran. E-mail: bzahraie@ut.ac.ir