Numerical Simulation Of Steel Tube-reinforced Concrete Composite Component’s Mechanical Properties Under Low Velocity Transverse Impact

Concrete filled steel tubular composite component is very popular as emerging structures. There have been many research related to the component’s seismic performance, axial compression performance and the mechanical property under fire. But the study of the mechanical performance under lateral impact load has not been reported, in view of the dangers of structure impacted to life and property, the research is necessary in this paper. As the research object, concrete filled steel tubular composite component under the action of the additive axial force is exerted lateral impact load at low speed, to study its mechanical performance under the action of impact load at low speed. The main contents are as follows:(1) Verifying the validity of finite element analysis software ABAQUS, establishing the model of concrete-filled steel tubular and extracting the time history curves of impact and deflection by calculating, last, to compare with existing experimental results. Simulation results show that the software is consistent with the test results, which are to prove the validity of the software to calculate. At the same time, the material parameters and the constitutive relation of the model are similar with composite components; it can be used as basis of steel tube-reinforced concrete column model.(2) Application software of ABAQUS is to set up composite beam and column model, to simulate the action of working mechanism under the lateral impact load at low speed, analysis of the stress of composite beams, the stress and strain development condition, failure mode and energy dissipation capacity, analyzing the action of the critical damage energy and residual bearing capacity of composite column under additive axial force, comparison of energy dissipation capacity of reinforced concrete and composite components. The results show that, the ability to resist lateral impact of composite components is good.(3) By changing the parameters of the model, research the main influence factors of composite component to resist lateral impact force. The main influence parameters is impact velocity and impact mass, steel yield strength and the strength of concrete, location factor, sectional steel ratio and boundary conditions, etc. The analysis results show that the change of the parameters of core concrete filled steel tube affected on the residual bearing capacity.