1. Professor, Institute of Construction Engineering and Management, National Central Univ., Jhongli, Taoyuan 32001, Taiwan.
2. Ph.D. Candidate, Institute of Construction Engineering and Management, National Central Univ., Jhongli, Taoyuan 32001, Taiwan (corresponding author).
3. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Univ. of Maryland, College Park, MD 20742.