1. Ph.D. Candidate, Faculty of Engineering, Dept. of Civil Engineering, Univ. Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia (corresponding author).
2. Associate Professor, Faculty of Engineering, Dept. of Civil Engineering, Univ. Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia.
3. Senior Lecturer, Faculty of Engineering, Dept. of Civil Engineering, Univ. Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia.
4. Professor, Faculty of Engineering, Dept. of Civil Engineering, Univ. Putra Malaysia, 43400, UPM Serdang, Selangor, Malaysia.