1. Graduate Research Assistant, Dept. of Civil and Environment Engineering, Univ. of Pittsburgh, 3700 O’Hara St., Pittsburgh, PA 15261.
2. Ph.D. Candidate, Dept. of Civil and Environment Engineering, Univ. of Pittsburgh, 3700 O’Hara St., Pittsburgh, PA 15261.
3. Postdoctoral Researcher, Dept. of Civil and Environment Engineering, Univ. of Pittsburgh, 3700 O’Hara St., Pittsburgh, PA 15261.
4. William Kepler Whiteford Professor, Dept. of Civil and Environment Engineering, Univ. of Pittsburgh, 3700 O’Hara St., Pittsburgh, PA 15261 (corresponding author).