1. Assistant Professor, Dept. of Civil, Structural and Environmental Engineering, Univ. at Buffalo, Ketter Hall, Buffalo, NY 14260 (corresponding author).
2. Assistant Professor, Dept. of Civil Engineering, Johns Hopkins Univ., Latrobe Hall, Baltimore, MD 21218.
3. Graduate Student, Dept. of Civil, Structural and Environmental Engineering, Univ. at Buffalo, Ketter Hall, Buffalo, NY 14260.