1. Professor, Dept. of Civil Engineering, Ferdowsi Univ. of Mashhad, Mashhad, 91779-48944 Iran (corresponding author).
2. Associate Professor, Dept. of Electrical Engineering, Ferdowsi Univ. of Mashhad, Mashhad, 91779-48944 Iran.
3. MS, Dept. of Civil Engineering, Ferdowsi Univ. of Mashhad, Mashhad, 91779-48944 Iran.