1. Assoc. Prof., Div. of Struct. Engrg., Univ. of California, San Diego, MC-0085, La Jolla, CA 92093.
2. Grad. Res. Asst., Div. of Struct. Engrg., Univ. of California, San Diego, MC-0085, La Jolla, CA.
3. Mat. Res. Engr., U.S. Army Cold Regions Research and Engineering Laboratory, Hanover, NH 03755-1290.