1. Graduate Student, ATLSS Engineering Research Center, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, PA 18015 (corresponding author).
2. Joseph T. Stuart Professor of Structural Engineering, ATLSS Engineering Research Center, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, PA 18015.
3. Bruce G. Johnston Professor of Structural Engineering, ATLSS Engineering Research Center, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, PA 18015.