1. IPA Researcher, National Institute of Standards and Technology, Gaithersburg, MD 20899; Assistant Project Scientist, Univ. of California-Davis, Davis, CA 961155.
2. Research Structural Engineer, National Institute of Standards and Technology, Gaithersburg, MD 20899 (corresponding author).
3. Associate Professor, Dept. of Architectural Engineering, Univ. of Hanyang, Ansan 15588, Korea.