1. Assistant Professor, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., Ames, IA 50011. E-mail: kejinw@iastate.edu
2. Associate Professor, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., Ames, IA 50011. E-mail: jkcable@iastate.edu
3. Research Assistant, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., Ames, IA 50011. E-mail: gezhi@iastate.edu