1.School of Civil Engineering;2.College of Aerospace Engineering, Chongqing University, Chongqing 400045, P. R. China;3.Chongqing Transport Commission, Chongqing 401147, P.R. China;4.Qinghai Provincial Transportation Construction Management Co., Ltd., Xining 810021, P. R. China;5.Qinghai Lake Tourism Development Group Co., Ltd., Xining 810003, P. R. China;6.Qinghai Provincial Transportation Holding Group Co., Ltd., Xining 810003, P. R. China