1. Assistant Professor, Dept. of Civil Engineering, North Carolina Agriculture and Technical State Univ., 1601 E. Market St., Greensboro, NC 27411 (corresponding author).
2. Research Assistant, Dept. of Civil Engineering, North Carolina Agriculture and Technical State Univ., 1601 E. Market St., Greensboro, NC 27411.
3. Associate Professor, Dept. of Civil Engineering, North Carolina Agriculture and Technical State Univ., 1601 E. Market St., Greensboro, NC 27411.