1. Ph.D. Candidate, Dept. of Structural Engineering, Univ. of California, San Diego, 9500 Gilman Dr. MC0085, La Jolla, CA 92093-0085 (corresponding author).
2. Professor, Dept. of Structural Engineering, Univ. of California, San Diego, 9500 Gilman Dr. MC0085, La Jolla, CA 92093-0085.
3. Assistant Professor, Dept. of Civil Engineering, Univ. of Nebraska-Lincoln, 2200 Vine St., 362 K Whittier Research Center, Lincoln, NE 68588-0856.
4. Scientific Director, Editech srl, Via de Bardi, 18, 50125 Florence, Italy.
5. Associate Professor, Dept. of Structural Engineering, Univ. of California, San Diego, 9500 Gilman Dr. MC0085, La Jolla, CA 92093-0085.