1. Structural Engineer, Structural Consultants and Associates, Sugar Land, TX 77478.
2. Research Structural Engineer, National Institute of Standards and Technology, Gaithersburg, MD 20899-8611 (corresponding author).
3. Research Structural Engineer, National Institute of Standards and Technology, Gaithersburg, MD 20899-8611.
4. NIST Fellow, National Institute of Standards and Technology, Gaithersburg, MD 20899-8611.