1. Department of Civil and Environmental Engineering, Kunsan National University, 558 Daehak-ro Rd., Kunsan 51450, Republic of Korea, https://orcid.org/0000-0001-9841-4882 (T.H.M.L.)
2. Technology Research Division, Korea National Railway, 242 Jungang-ro Rd., Daejeon 34618, Republic of Korea
3. Department of Civil and Environmental Engineering, Kunsan National University, 558 Daehak-ro Rd., Kunsan 51450, Republic of Korea (Corresponding author), e-mail: dpark@kunsan.ac.kr https://orcid.org/0000-0002-6063-6188