1. Dept. of Construction Engineering, Chaoyang Univ. of Technology, 168 Jifeng E. Rd., Wufeng District, Taichung, 41349 TW, e-mail: Thsr88@yahoo.com.tw
2. Dept. of Construction Engineering, Chaoyang Univ. of Technology, 168 Jifeng E. Rd., Wufeng District, Taichung, 41349 TW, e-mail: tai_seong@hotmail.com
3. Dept. of Construction Engineering, Chaoyang Univ. of Technology, 168 Jifong East Rd., Wufong District, Taichung 41349, TW (Corresponding author), e-mail: schsu@cyut.edu.tw
4. Dept. of Civil & Environmental Engineering, Univ. of Missouri at Columbia, Columbia, MO 65211 US, e-mail: BowdersJ@missouri.edu