1. School of Civil Engineering, Tianjin University, 92 Weijin Rd., Tianjin 300072, China; and Tianjin Metro Group Co., Ltd., 36 Huaxing Rd., Tianjin 300000, China (Corresponding author), e-mail: zxclinton@126.com, https://orcid.org/0000-0002-9610-5338