Experimental Study And Simulation On Concrete Filled Steel Tubular Column Under Lateral Impact With Fixed-fixed Boundary Condition

The impact is a kind of phenomenon existing extensively in project reality. The research of intensity, rigidity, the stability, critical energy and critical impact force belongs to the fields of structure impact resistance, which the structure is struck in the impact load. Because the response of the structure in impact load is a complicated non-linear mechanics problem, the research of this field is still lacking, especially, on the lateral impact of the CFST. As the application of the CFST being developed day by day and accident of CFST being destroyed in impact load emerge in an edless stream, the research of the CFST structure impact characteristic is becoming very essential. In this paper, taking the CFST column with fixed-fixed boundary condition as subject investigated, baseing on the model test in impact load, utilizing finite element software ANSYS/LS-DYNA to go on a large amount of computational analysis. Primarily studing the failure mode of CFST column with fixed-fixed boundary condition under lateral impact, recording the time historytime curve of impact and axial force.In the paper, first, impact experiment has been carried on. Creatively useing disc spring axis force device to exert axis force , have resolved the axis force relaxation. The dynamic response and destruction course of the model is measured in impact load. The travel time curve of the test specimen is drow up on the drop hammer. In this paper, the explicit finite element calculation theory is applied, and the explicit finite element and computed technology has been summarized. It has been basically researched on numerical calculation principle and theoretics method of the impact contact dynamics.In this paper, entity's modeling is bulid, and then impact realistic simulation of the test model is studied. Contrasted to the experimentation, the simulate results has been verified. Further the computational model is searched, which can describe the test results reasonably. On the contrary, through a large amount of simulation, the impact resistance of test sample is discussed. In this way, the experimental number and the cost are effectively reduced.In the course of simulation, it is studed that the deflection, strain, stress, size of impacting force and regularities of distribution of the test sample when the drop hammer with different impact speed. While the deflection and impacting force curve are made and the critical energy of sample has been found out.Finally, it is shown by means of test and computer simulation: The CFST has good resistance to impact load, when the component is added the loads suddenly, the CFST demonstrates very good ductility. When the CFST is subjected to the lateral impact load, the materials have obvious yield stadge. The bigger the speed and quality of the drop hammer, the more fragile of CFST dynamic response.