1. Assoc. Prof., Dept. of Architectural and Civ. Engrg., Univ. of Texas, Austin, Tex.
2. Grad. Research Asst., Dept. of Architectural and Civ. Engrg., Univ. of Texas, Austin, Tex.
3. Research Assoc., Civ. Engrg. Dept., Stanford Univ., Stanford, Calif.