1. Department of Civil Engineering; Clemson University; Lowry Hall, Box 340911, Clemson; South Carolina; 29634-0911; USA
2. Department of Civil and Environmental Engineering; Stanford University; 473 Via Ortega, Room 314, Mail Code 4020; Stanford; California; 94305; USA
3. Los Alamos National Laboratory; XTD-Division (XTD-3); Mail Stop T087; Los Alamos; New Mexico; 87545; USA