| This paper to study the two different forms of composite stainless steel tube concrete members under lateral impact resistance performance of impact load,the application of ABAQUS finite element analysis software,respectively,set up a solid stainless steel tube concrete column and insulating interlayer stainless steel limited element analysis model of concrete filled steel tube composite column,after compared with the existing test data validation,to validate the precision of the model on the basis of meet the requirements for solid stainless steel tube concrete composite column analysis of the impact energy,the thickness of the stainless steel pipe and stainless steel tube and concrete strength grade change on the impact resistance of concrete column solid stainless steel square tube.The anti-impact performance of the composite column of stainless steel tubular concrete(CFST)with hollow interlayer is analyzed under different impact velocity and different hollow ratio.Finally,according to the analysis results of finite element model,a method to increase the impact resistance of specimens is proposed.Specific research program and contents of this paper:(1)this paper introduces the superior performance of stainless steel materials and the great potential of stainless steel materials in the field of architecture;The development and research status of concrete-filled steel tube composite members at home and abroad are summarized.(2)the tests of three concrete-filled steel tube composite members subjected to lateral impact load are briefly introduced,and the results of the three tests are analyzed.It is concluded that the tests go through four stages in the impact process,which are peak stage,adjustment stage,platform stage and unloading stage respectively.Compared with hollow CFST column,solid CFST column has better anti-collision performance.Under the action of lateral impact load,the concrete composite members of stainless steel tube can show good anti-impact performance.The larger the hollow ratio is,the smaller the impact force peak value of the specimen will be,and the larger the displacement of the impact position of the specimen will be.The smaller the impact resistance capacity of the specimen will be,the more likely the specimen will be damaged.(3)using the ABAQUS finite element software established by solid stainless steel square tube under lateral impact load of concrete composite column and the finite element model of hollow sandwich composite stainless steel tube concrete column,at the time of modeling,give full consideration to the stainless steel materials under external load and strain rate on the reinforcement effect of the stainless steel material,also considering the stress and strain of concrete material efficiency,and use of the second chapter two test the correctness of the finite element model is verified by the data.(4)based on the authentication model is feasible for solid stainless steel tube concrete column,by changing the height of drop hammer impact analysis of the impact energy and reference of related specifications,the thickness of the stainless steel pipe and stainless steel tube and concrete strength grade change on solid stainless steel square tube the influence of the impact resistance of concrete column.The analysis shows that the impact energy is the main reason affecting the mid-span deflection of the specimen.Increasing the thickness of the outer stainless steel tube and the strength grade of the outer stainless steel tube can effectively increase the impact resistance of the specimen.The anti-imp act performance of concrete column with solid stainless steel tube can not be improved by increasing the strength grade of concrete.(5)for the composite column of stainless steel tubular concrete with hollow interlayer,the anti-impact performance of the composite column with different impact velocity and different hollow ratio was analyzed.It is concluded that the impact velocity has a great influence on the peak of the impact force on the specimen,the mid-span deflection has a great influence on the impact force platform value and the time to reach the deflection platform stage.When the heart rate was=0.6～0.69,the impact force platform value of the specimens was the largest,and the anti-impact performance of the specimens was the best.It is recommended that no component with a hollow ratio greater than 0.81 be used in engineering.Comparing two different types of stainless steel tube concrete composite members,the anti-collision performance of hollow interlayer stainless steel tube concrete composite members is better than that of solid stainless steel tube concrete composite members. |
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