1. Senior Research Structural Engineer, Engineering Laboratory, National Institute of Standards and Technology, 100 Bureau Dr., Stop 8611, Gaithersburg, MD 20899-8611.
2. Research Structural Engineer, Engineering Laboratory, National Institute of Standards and Technology, 100 Bureau Dr., Stop 8611, Gaithersburg, MD 20899-8611 (corresponding author).
3. Research Structural Engineer, U.S. Army Engineer Research and Development Center, Vicksburg, MS 39180-6199.
4. Leader, Structures Group, Engineering Laboratory, National Institute of Standards and Technology, 100 Bureau Dr., Stop 8611, Gaithersburg, MD 20899-8611.