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Concrete-filled double skin steel tubes (CFDST) are a type of steel-concrete composite structure. This structure has been widely used in high-rise buildings, bridges and power facilities. The current research about it focuses on the performance about axial compression, bias, bending, and low cyclic loads. However, during the whole life cycle, these structures may inevitably suffer from various impact loads. In order to understand the dynamic response of these structures under lateral impact, this paper sets up a finite element model to analyze the destruction modal, impact force (F), deflection (⊿) as well as other dynamic responses of CFDST under lateral impact load. One end of the CFDST is fixed while the other end is simply supported. The whole process and failure mechanics of the dynamic response of CFDST under lateral impact are analyzed basically, laid the foundation for further parametric analysis and practical calculation method.

Finite element analysis of the dynamic behavior of concrete-filled double skin steel tubes (CFDST) under lateral impact with fixed-simply support