1. Graduate Student, Via Fellow, Dept. of Civil and Environmental Engineering, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Virginia Polytechnic Institute and State Univ., 102B Patton Hall, Blacksburg, VA 24061-0105.
3. Former Graduate Student, Dept. of Civil and Environmental Engineering, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061.
4. Associate Director for Structures, Pavements, and Asset Management, Virginia Transportation Research Council, 530 Edgemont Rd., Charlottesville, VA 22903.