Experimental Studies And Simulation Analysis On Dynamic Response Of FRP-Concrete-Steel Composite Column Under A Low Velocity Transverse Impact Loading

The FRP-Concrete-Steel composite structure is improved basing on the Concrete-Filled Double Skin Steel tubes, in addition to having the advantages of high bearing capacity, light weight, good ductility and toughness of the Concrete-Filled Double Skin Steel tubes, the FRP-Concrete-Steel composite structure has the advantages of good durability and no need of fire protection. In recent years, many scholars have made a lot of research on it, researches were mainly focused on the static performance, such as the axial pressure, bias voltage, pure bending, for the dynamic performance of the FRP-Concrete-Steel composite structure, especially the crashworthiness of research is still relatively small. Therefore, in this paper, FRP-Concrete-Steel composite column as the research object, to carry out its in the lateral impact of the test and theoretical research. Main contents include:1)The lateral impact test carried out on the test machine named DHR9401 in Taiyuan University of Technology. The main parameters of the specimens include the impact height and the FRP layers. The overall residual deformation, impact force time history curve and surface strain of FRP were obtained after the test.2)Then a finite element analysis(FEA) model was established to predict the impact behaviour of The FRP-Concrete-Steel composite column members, in which the strain rate effects of the materials and the anisotropic of FRP were considered. By comparing with the experimental results, the correctness and validity of the material constitutive model, the contact property and the boundary conditions are verified.3)On the basis of the finite element model, analyzes the FRP layer number, direction of FRP, the yield strength of steel pipe, concrete strength and other parameters impact on the dynamic response of The FRP-Concrete-Steel composite column. At the same time, the finite element model is used to compare the difference between the FRP-Concrete-Steel composite structure and the Concrete-Filled Double Skin Steel tubes in the same axial load bearing capacity.