1. Dept. of Civil Engineering, College of Judea and Samaria, P.O.B. 3, Ariel 44837, Israel; formerly, Visiting Scientist, State Univ. of New York at Buffalo, Buffalo, NY 14260-4300.
2. Dept. of Civil, Structural, and Environmental Engineering, State Univ. of New York at Buffalo, Buffalo, NY 14260-4300 (corresponding author).