1. Graduate Student, Dept. of Civil and Environmental Engineering, Sungkyunkwan Univ., 2066 Seobu-Ro, Jangan-gu, Suwon-si 440-746, South Korea.
2. Graduate Student, Dept. of Global Construction Engineering, Sungkyunkwan Univ., 2066 Seobu-Ro, Jangan-gu, Suwon-si 440-746, South Korea.
3. Associate Professor, School of Civil and Environmental Engineering, Univ. of New South Wales, Sydney, NSW 2052, Australia.
4. Professor, Dept. of Civil and Environmental Engineering, Sungkyunkwan Univ., 2066 Seobu-Ro, Jangan-gu, Suwon-si 440-746, South Korea (corresponding author).