1. Graduate Student, Glenn Dept. of Civil Engineering, 202 Lowry Hall, Clemson Univ., Clemson, SC 29634, US (Corresponding author), e-mail: hkizhak@g.clemson.edu
2. Associate Professor, Glenn Dept. of Civil Engineering, 220 Lowry Hall, Clemson Univ., Clemson, SC 29634, US, e-mail: prangar@clemson.edu