1. Professor, Dept. of Structural Engineering, Univ. of California–San Diego, La Jolla, CA 92093 (corresponding author).
2. Senior Researcher, Korean Institute of Construction Technology, Geotechnical Engineering Research Division, Goyang, Ilsan, Republic of Korea 411-712.
3. Assistant Professor, Dept. of Civil and Environmental Engineering and Geodetic Science, Ohio State Univ., Columbus, OH 43210.