Research On The Residual Strength Of H-shaped Steel Column Subjected To Lateral Impact Under The Preload Axial Force

Because H-shaped steel column has the advantages of high structural stability,strong bending resistance and simple processing,it is often used as the main load-bearing component in steel structure buildings,and is widely used in high-rise buildings,industrial buildings,long-span buildings and other structures.However the building structure is vulnerable to lateral impact load during its service period,and the H-shaped steel column has the characteristics of light weight and small plate thickness,once it suffers from accidental impact,it will lead to local damage of the structure in the light,and the overall collapse of the structure in the heavy,resulting in serious casualties.Therefore,it is very important to study the dynamic response and residual bearing capacity of H-shaped steel column subjected to lateral impact.The main research contents of this paper are as follows:Taking the HW 100×100×6×8 H-shaped steel column with the height of 1.5m as the research object,the thesis uses finite element software ABAQUS to analyze dynamic response and residual strength of H-shaped steel column under lateral impact,and compares with the existing H-shaped column lateral impact test and axial static load test,the result showing a good coincidence.Then considering the axial load and the position of lateral impact of H-shaped steel column in the actual load-bearing process,the thesis makes the lateral eccentric impact and vertical static load finite element simulation of the hot rolled H-shaped column with previous axial force,in order to study the dynamic response and residual bearing capacity of H-shaped column.And by changing the parameters of axial load,impact position,impact velocity and impact mass,the influence of different parameters on the dynamic response and residual bearing capacity of H-shaped steel column after impact was obtained.The failure pattern,residual deformation and impact force-time history curve of specimens were obtained from lateral impact finite element simulation,and by changing the parameters of axial load,impact position,impact velocity and impact mass,the failure pattern,residual deformation and impact force-time history curve of specimens have different changes.With the increase of impact velocity and impact mass,the damage degree and residual deformation of specimens increase significantly,but the changes of axial load and impact position have little effect on the damage degree and residual deformation of specimens;with the increase of the impact velocity,the impact force peak value,the impact force platform value and the impact force duration of specimens have increased,and with the increase of the impact mass and the impact position,the impact force duration of specimens has increased,but the change of the axial load has little effect on the impact force-time history curve of specimens.The failure pattern,axial displacements-load curve and ultimate bearing capacity of the specimens were obtained from the vertical static load finite element simulation,and by changing the parameters of axial load,impact position,impact velocity and impact mass,it is found that the changes of different parameters have different degrees of influence on the ultimate bearing capacity of specimens,the ultimate bearing capacity of specimens decreases with the increase of impact velocity,impact mass,axial load and impact position.