1. Assistant Professor, Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136 (corresponding author).
2. Research Assistant, Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136.
3. Visiting Professor, Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136.