1. Ph.D. Candidate, Dept. of Structural Engineering, Univ. of California, San Diego, La Jolla, CA 92093.
2. Professor, Dept. of Structural Engineering, Univ. of California, San Diego, La Jolla, CA 92093 (corresponding author).
3. Research Director, Hilti Corporation, 100 Feldkircherstrasse, Schaan, Liechtenstein.
4. Director of Codes and Standards, Hilti North America, 84 Mt. Rainier Dr., San Rafael, CA.