1. Assoc. Prof., Mechanics and Structures Dept., School of Engrg. and Applied Sci., Univ. of California, Los Angeles, Calif.
2. Grad. Student, Mechanics and Structures Dept., School of Engrg. and Applied Sci., Univ. of California, Los Angeles, Calif.
3. Grad. Student, Mechanics and Structures Dept., School of Engineering and Applied Sci., Univ. of California, Los Angeles, Calif.