1. Graduate Student, Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136.
2. Assistant Professor, Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136
3. A.P. and Florence Wiley Chair Professor, Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843-3136