1. Graduate Student, Civil & Environmental Engineering, Univ. of Vermont, 33 Colchester Ave., Burlington, VT 05405.
2. Professor, Civil & Environmental Engineering, Univ. of Vermont, 33 Colchester Ave., Burlington, VT 05405.
3. Professor, Mechanical Engineering, Univ. of Vermont, 33 Colchester Ave., Burlington, VT 05405.
4. Associate Professor, Civil & Environmental Engineering, Univ. of Vermont, 33 Colchester Ave., Burlington, VT 05405 (corresponding author).