1. Assistant Professor, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., 476 Town Engineering Building, Ames, Iowa 50011-3232. E-mail: djwhite@iastate.edu
2. Graduate Research Assistant, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., 405 Town Engineering Building, Ames, Iowa 50011-3232. E-mail: meks@iastate.edu
3. Associate Professor, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., 406 Town Engineering Building, Ames, Iowa 50011-3232. E-mail: sri@iastate.edu
4. Lecturer, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., 490 Town Engineering Building, Ames, Iowa 50011-3232. E-mail: suleiman@iastate.edu