1. PhD Student, Dept. of Civil & Construction Engineering, Iowa State Univ., Town Engineering Building, Ames, IA 50011-3232.
2. Post-doctoral Researcher, Dept. of Civil & Construction Engineering, Iowa State Univ., Town Engineering Building, Ames, IA 50011-3232.
3. Associate Professor, Dept. of Civil & Construction Engineering, Iowa State Univ., Town Engineering Building, Ames, IA 50011-3232.