Bending Energy Dissipation And Finite Element Optimization Of H-Section Steel Members With Different Systems

In order to study the energy dissipation performance of H-shaped steel members under pure bending load,it is decided to conduct quasi-static tests on H-shaped steel members with different sections under different loading systems.The bending moment and rotation angle at the beam end of the H-shaped steel member under the real earthquake are fitted by different loading systems.Through the angular displacement and internal force at the beam end obtained,the influence of different loading systems and different sections on the hysteretic performance of the H-shaped steel member is discussed,and the damage form,hysteretic performance,stiffness degradation and energy dissipation capacity of each specimen are compared and analyzed,and the hysteretic energy dissipation capacity of the H-shaped steel member under different loading systems is obtained.In this test,eight types of H-section steel members were studied by using the loading device.The ultra-low cycle bending hysteretic test was carried out under the super-large plastic hysteretic loading system,the lifting I loading system,the lifting II loading system,and the lifting loading system after the reduction,and the multi-cycle lifting loading test was carried out on the H-section steel members of the Class I web and Class II flange.The effects of flange width-thickness ratio,loading amplitude,loading sequence and number of hysteretic cycles on the bending energy dissipation of H-section steel members are studied and analyzed.The effects of failure mode,cumulative damage and energy dissipation law on the flexural hysteretic energy dissipation performance of eight types of H-section steel members are discussed.The cumulative damage of each component is fitted with parameters,and finally the energy consumption analysis of the component is statistically fitted to obtain the life prediction formula.In this test,ABAQUS finite element software analysis was carried out for each specimen under different loading systems.By simulating the actual working conditions,the stress and strain distribution of the component under different loading systems can be obtained through the software,and the difference between the hysteretic curve obtained from the test and the finite element test and the difference between the failure modes of the component can be analyzed,and the accuracy of the fitting results can be verified by comparing the experimental data.In the process of finite element simulation,in order to ensure that the model establishment,mesh division and loading system are the same as the actual component,the element type of the component,material properties of the component and the coupling relationship between the components are considered in the model establishment,and several different parameters are modified and compared in the mesh division and initial defects,In the process of finite element simulation,the weld zone of Hshaped steel members is simulated.Through introducing the welding heat affected zone,it can be found that the hysteretic curves of the test results and the finite element results are identical in the elastic phase.Through the establishment of the members and the adjustment of the parameters,a general ABAQUS model for studying the hysteretic energy consumption of H-shaped steel members is obtained,which can be used to predict the failure modes under different loading systems Stiffness degradation and energy consumption capacity provide theoretical guarantee for engineering design and application.This test complements the research and analysis of real tests in the finite element method,and extends the single level cyclic loading hysteretic loading regime for each H-shaped steel member at different levels on the original basis to supplement and verify the accuracy of the fitting results of each cumulative damage parameter,making the test and finite element complementary.