1. Assistant Professor, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., Ames, IA 50011. E-mail: rwalters@iastate.edu
2. Professor, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., Ames, IA 50011. E-mail: ejaselsk@iastate.edu
3. Postdoctoral Researcher, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., Ames, IA 50011. E-mail: zjz@iastate.edu
4. Graduate Research Assistant, Dept. of Statistics, Iowa State Univ., Ames, IA 50011. E-mail: muellkim@iastate.edu
5. Graduate Research Assistant, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., Ames, IA 50011. E-mail: manop@iastate.edu