An efficient model for vehicle-track-soil dynamic interaction based on Green's function, cyclic calculation and multi-time-step solution methods.

• A high-efficient model for vehicle-track-soil dynamic interaction based on hybrid solution method. • Cyclic calculation boundary and multi-time-step strategies are integrated into the hybrid model. • The proposed hybrid model can evaluate the vehicle-track-soil performance efficiently without losing accuracy. To meet the demand for dynamic analysis of railway engineering structures accurately, the numerical model considering the coupled vibrations of the vehicle, track and substructure becomes a research tendency. However, it generates low-efficiency risk due to high degrees of freedom of the model. In this paper, a hybrid integration method based on the implicit scheme and Green's function is introduced and combined with the cyclic calculation method and the multi-time-step solution method to optimize the dynamic procedure for high-efficient solution of vehicle-track-soil (VTS) dynamic interaction. The VTS system is divided into two sub-models: vehicle-rail sub-model and the track slab-soil sub-model. The compatibility between two sub-models is maintained by the equilibrium mechanism of the fasteners' interaction forces. Through detailed validation, discussion and numerical studies, the feasibility and efficiency of the proposed model combing the hybrid integration method and two optimized dynamic solution strategies are fully demonstrated in the dynamic assessment of VTS dynamic interaction. [ABSTRACT FROM AUTHOR]