1. Former Graduate Student Researcher, U.S. Army Corps of Engineers, 1325 J St., Sacramento, CA 95814.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, One Shields Ave., Davis, CA 95616 (corresponding author).
3. Graduate Student Researcher, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, One Shields Ave., Davis, CA 95616.
4. Visiting Graduate Scholar, Dept. of Bridge Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China.