| In recent years,with the development of economy,our country has strongly advocated the development of steel structures and fabricated buildings.Steel building energy conservation,material saving,land saving,water saving,and environmental protection are in line with the needs of sustainable development in China.The shape of the H-section steel is economical and reasonable,and it is suitable for assembly.It is widely used in the prefabricated steel structure system and the ―industrialized residential‖ building system.In the existing studies of H-beams with different cross-sections,the static analysis and quasi-static analysis of H-beams mainly focus on the lack of relevant dynamic analysis.In addition,the popularity of cars in China has increased year by year,which has increased the probability that buildings will encounter accidental impact during service.At present,no scholars have studied the dynamic response characteristics of H-shaped steels under the impact from the perspective of the aspect ratio of plates.Therefore,in this paper,H-shaped steel members with different cross-sections are taken as the research object,and their dynamic response and residual bearing capacity under impact are studied.This paper first analyzes the dynamic response of the material’s dynamic behavior and structure,and points out that it needs a lot of assumptions to analyze the dynamic problem of the structure through theoretical analysis,and there is a big difference with the actual model,pointing out that the model available for theoretical analysis is relatively limited.The fine finite element model can simulate the actual dynamic behavior of structural components.In this paper,a numerical model of the impact of H-beams was created by the universal finite element software ABAQUS.Based on the existing impact tests,the model was verified and modified.The effective model of the impact was obtained and used for further parameter analysis.According to the European steel structure design specification and the Japanese steel structure design specification section classification characteristics,this article selects nine sets of different types of cross-section specimens,based on the impact model from impact time history,mid-span deflection time history and different sheet plastic deformation consumption Three aspects can be analyzed to study the dynamic response of H-shaped steel beam under impact force under the same impact energy,the ratio of height to thickness of the web,flange width to thickness ratio,boundary conditions and length under different impact energy.The impact of mass and velocity of the impactor on the dynamic response of the component under impact.Finally,the damage and failure of the component damage are discussed in two aspects.When the impact energy is small,the H-beams are given ten different levels of damage in different degrees by applying different impact speeds of 10 to the drop hammer.Then the axial compression model of the steel member was created and the residual bearing capacity of the member under different damages was studied.When the impact energy is large,the components fail under the impact,and the deformation of the structure after the failure of the first layer steel column and the seismic performance of the structure under earthquake are studied through the spatial three-dimensional steel frame model created by ABAQUS. |
