1. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of Washington, 201 More Hall, Seattle, WA 98195 (corresponding author).
2. Design Engineer, KPFF, Seattle, WA 98101; formerly, Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of Washington, 201 More Hall, Seattle, WA 98195.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Washington, 201 More Hall, Seattle, WA 98195.