1. School of Civil and Environmental Engineering; Georgia Institute of Technology; Atlanta GA 30332 USA
2. Department of Civil Engineering; Andong National University; Andong Gyeongsangbuk-do 36729 Korea
3. Department of Civil and Environmental Engineering; Rice University; Houston TX 77005 USA
4. Karen and John Huff School Chair and Professor, School of Civil and Environmental Engineering; Georgia Institute of Technology; Atlanta GA 30332 USA