1. Professor and Fazlur R. Khan Endowed Chair of Structural Engineering and Architecture, Dept. of Civil and Environmental Engineering, ATLSS Research Center, 117 ATLSS Dr., Imbt Labs, Bethlehem, PA 18015-4729 (corresponding author).
2. Senior Structural Engineer, MWH Americas, Inc., 1801 California St., Suite 2900, Denver, CO 80202; formerly, Graduate Research Assistant, Dept. of Civil, Environmental and Architectural Engineering, Univ. of Colorado, Boulder, CO 80309-0428.