1. Assistant Professor, Dept. of Civil and Environmental Engineering, Pennsylvania State Univ., 231D Sackett Bldg., University Park, PA 16851 (corresponding author).
2. Dean, Faculty of Civil Engineering and Architecture, West Pomeranian Univ. of Technology, Al. Piastów 50, Szczecin 70-310, Poland.
3. Ph.D. Candidate, Faculty of Civil Engineering and Architecture, West Pomeranian Univ. of Technology, Al. Piastów 50, Szczecin 70-310, Poland.
4. Assistant Professor, Dept. of Civil Engineering, Univ. of Hong Kong, HW 5-26, Pokfulam Rd., Hong Kong.