1. Associate Professor of Civil and Environmental Engineering, Univ. of Maine, 5711 Boardman Hall, Orono, ME 04469-5711 (corresponding author). E-mail: william.davids@umit.maine.edu
2. Graduate Research Assistant, Department of Civil and Environmental Engineering, Univ. of Maine, 5711 Boardman Hall, Orono, ME 04469-5711. E-mail: edwin.nagy@maine.edu
3. Structural Engineer, SGH Consulting Engineers, Waltham, MA 02453. E-mail: MCRichie@sgh.com