1. Assistant Professor, Dept. of Construction Science, Texas A&M Univ., 3137 TAMU, College Station, TX 77843.
2. Assistant Professor, School of Civil Engineering, Chungbuk National Univ., 1 Chungdae-ro, Seowon-gu, Cheongju-si, Chungcheongbuk-do 28644, Republic of Korea (corresponding author).