1. Assistant Professor, Civil Engineering Dept., King Mongkut’s Univ. of Technology Thonburi, Trungkru District, Bangkok, Thailand (corresponding author).
2. Assistant Professor, Civil Engineering Dept., King Mongkut’s Univ. of Technology Thonburi, Trungkru District, Bangkok, Thailand.
3. Professor, Civil Engineering Dept., King Mongkut’s Univ. of Technology Thonburi, Trungkru District, Bangkok, Thailand.