1. Senior Lecturer, Faculty of Civil Engineering, Universiti Teknologi MARA, Penang Campus, Jalan Permatang Pauh, 13500 Permatang Pauh, Penang, Malaysia (corresponding author).
2. Lecturer, Faculty of Civil Engineering, Universiti Teknologi MARA, Penang Campus, Jalan Permatang Pauh, 13500 Permatang Pauh, Penang, Malaysia.
3. Senior Lecturer, Faculty of Civil Engineering, Universiti Teknologi MARA, Penang Campus, Jalan Permatang Pauh, 13500 Permatang Pauh, Penang, Malaysia.