1. Assistant Professor, Dept. of Civil Engineering, Namik Kemal Univ., Tekirdag 59860, Turkey; Visiting Scholar, Dept. of Civil and Environment Engineering, Univ. of Southern California, Los Angeles, CA 90089-2531.
2. Research Associate, Dept. of Civil and Environment Engineering, Univ. of Southern California, Los Angeles, CA 90089-2531.
3. Research Professor, Dept. of Civil and Environment Engineering, Univ. of Southern California, Los Angeles, CA 90089-2531 (corresponding author).