1. DOE Samuel Massie Chair Professor, Dept. of Civil Engineering, NC A&T State Univ., Greensboro, NC 27411.
2. Research Assistant, Dept. of Civil Engineering, NC A&T State Univ., Greensboro, NC 27411 (corresponding author).
3. Research Assistant, Dept. of Civil Engineering, NC A&T State Univ., Greensboro, NC 27411.