1. Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois, 205 N. Mathews Ave., Urbana, IL 61801-2352. E-mail: tstark@uiuc.edu
2. Assistant Professor, Dept. of Civil Engineering, 209-D Auburn Science and Engineering Center, Univ. of Akron, Akron, OH 44325-3905 (corresponding author). E-mail: hchoi@uakron.edu
3. Johnson, Mimiran and Thompson, 72 Loveton Circle, Baltimore, MD 21152. E-mail: smccone@umm.edu