1. Graduate Student, Dept. of Civil Engineering, State Univ. of New York at Buffalo, 240 Ketter Hall, Buffalo, NY 14260.
2. Research Associate Professor, Dept. of Civil Engineering, State Univ. of New York at Buffalo, 240 Ketter Hall, Buffalo, NY 14260.
3. Professor, Dept. of Civil Engineering, State Univ. of New York at Buffalo, 240 Ketter Hall, Buffalo, NY 14260 (corresponding author). E-mail: pkb@eng.buffalo.edu