1. Associate Professor, Dept. of Construction Engineering, National Taiwan Univ. of Science and Technology, No. 43 Section 4 Keelung Rd., Taipei 106, Taiwan (corresponding author).
2. Assistant Professor, Dept. of Construction Engineering, National Taiwan Univ. of Science and Technology, No. 43 Section 4 Keelung Rd., Taipei 106, Taiwan.
3. Research Assistant, Dept. of Construction Engineering, National Taiwan Univ. of Science and Technology, No. 43 Section 4 Keelung Rd., Taipei 106, Taiwan.