1. Engineer, Moffatt and Nichol, Walnut Creek, CA. Formerly doctoral student at Univ. of Michigan, Ann Arbor, MI.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Michigan, Ann Arbor, MI (corresponding author).
3. Frank E. Richart, Jr. Collegiate Professor, Dept. of Civil and Environmental Eng., Univ. of Michigan, Ann Arbor.