1. Ph.D. Student, Dept. of Construction Engineering, National Taiwan Univ. of Science and Technology, Taipei, Taiwan.
2. Professor, Dept. of Construction Engineering, National Taiwan Univ. of Science and Technology, Taipei, Taiwan.
3. Professor, Dept of Civil Engineering, National Taiwan Univ., Taipei, Taiwan (corresponding author).
4. Professor, Dept. of Civil Engineering, Clemson Univ., Clemson, SC.