1. Bangkok, TH, e-mail: prasan49@hotmail.com
2. Department of Civil and Coastal Engineering, Univ. of Florida, P.O. Box 116580, Gainesville, FL 32611 US, e-mail: tia@ce.ufl.edu
3. Department of Construction Engineering, Chaoyang Univ. of Technology, Taichung 41349, TW (Corresponding author), e-mail: mglee@cyut.edu.tw
4. Department of Civil Engineering, National Kaohsiung Univ. of Applied Sciences, Kaohsiung 80778, TW, e-mail: yuminsu@kuas.edu.tw