[1
]Structural Engineer, Kayson Company, Tehran, Iran; formerly, Graduate Student, Dept.
of Civil and Environmental Engineering, Univ. of Massachusetts, Amherst, MA 01003.
[2
]Associate Professor, Dept. of Natural Resources Conservation, Univ. of Massachusetts,
Amherst, MA 01003 (corresponding author).
[3
]Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of Massachusetts,
223 Marston Hall, Amherst, MA 01003.