1. Doctoral Candidate, New York Univ., 6 Metrotech Center, Brooklyn, New York 11201.
2. Graduate Research Assistant, New York Univ., 6 Metrotech Center, Brooklyn, New York 11201.
3. Professor and Head, Civil and Urban Engineering Dept., New York Univ., 6 Metrotech Center, Brooklyn, New York 11201 (corresponding author).
4. Graduate Student, New York Univ., 6 Metrotech Center, Brooklyn, New York 11201.