1. Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of Illinois, 205 N. Mathews, Urbana, IL 61801.
2. Structural and Civil Engineering Partner, Skidmore Owings and Merrill LLP, 224 S. Michigan, Suite 1000, Chicago, IL 60604.
3. Structural Engineer, Skidmore Owings and Merrill LLP, 224 S. Michigan, Suite 1000, Chicago, IL 60604.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois, 205 N. Mathews, Urbana, IL 61801 (corresponding author).