School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China;
School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China;
School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China;
School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China;
Train–bridge system; Ensemble method; Surrogate model; Nonlinear autoregressive with exogenous input; Subset simulation with splitting; Small probability;