1. Assistant Professor, Dept. of Structural Engineering, Univ. of California, San Diego, 9500 Gilman Dr., M.C. 0085, La Jolla, CA 92093-0085.
2. Graduate Student Researcher, Dept. of Structural Engineering, Univ. of California, San Diego, 9500 Gilman Dr., M.C. 0085, La Jolla, CA 92093-0085.
3. Professor, Dept. of Structural Engineering, Univ. of California, San Diego, 9500 Gilman Dr., M.C. 0085, La Jolla, CA 92093-0085.