1. Professor, Dept. of Structural Engineering, Univ. of California at San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0085 (corresponding author). E-mail: jpconte@ucsd.edu
2. Graduate Student, Dept. of Structural Engineering, Univ. of California at San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0085. E-mail: x1he@ucsd.edu
3. Graduate Student, Dept. of Structural Engineering, Univ. of California at San Diego, 9500 Gilman Dr., La Jolla, CA 92093-0085. E-mail: bmoaveni@ucsd.edu
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of Southern California, 3620 S. Vermont, Los Angeles, CA 90089-2531. E-mail: masri@usc.edu
5. Associate Professor, Dept. of Mechanical Engineering, California State Polytechnic Univ., 3801 W. Temple Ave., Pomona, CA 91768. E-mail: jpcaffrey@csupomona.edu