1. Lecturer, Dept. of Civil Engineering, Khon Kaen Univ. (KKU), Khon Kaen 40002, Thailand (corresponding author).
2. Professor, Dept. of Civil Engineering, King Mongkut’s Univ. of Technology Thonburi (KMUTT), Bangkok 10140, Thailand.
3. Ph.D. Student, Dept. of Civil Engineering, King Mongkut’s Univ. of Technology Thonburi (KMUTT), Bangkok 10140, Thailand.