1. Department of Civil EngineeringKyung Hee University Yongin 17104 South Korea
2. Golder Associates Inc., 5170 Peachtree Rd. Building 100, Suite 300 Atlanta GA 30341 USA
3. School of Civil and Environmental EngineeringGeorgia Institute of Technology Atlanta GA 30332‐0355 USA
4. Department of Civil & Environmental EngineeringWest Virginia University Morgantown WV 26508 USA