1. Associate Professor, Dept. Structural Engineering, Univ. of California–San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0085.
2. Professor, Civil and Environmental Engineering, Brigham Young Univ., 368 CB Provo, UT 84602.
3. Graduate Student Researcher, Civil and Environmental Engineering, Brigham Young Univ., 368 CB Provo, UT 84602.