1. Research Associate, Dept. of Civil and Environmental Engineering, Engineering Research Center for Advanced Technology for Large Structural Systems, Lehigh Univ., 117 ATLSS Dr., Bethlehem, PA 18015-4729.
2. Professor and the Fazlur R. Khan Endowed Chair of Structural Engineering and Architecture, Dept. of Civil and Environmental Engineering, Engineering Research Center for Advanced Technology for Large Structural Systems, Lehigh Univ., 117 ATLSS Dr., Bethlehem, PA 18015-4729 (corresponding author).