Research And Application Of Multiple Yield Metal Energy Dissipation Plate Components

The traditional buckling restrained brace has the disadvantage of large yield displacement and small displacement which can not fully exert its energy dissipation function.Therefore,it is necessary to research and develop a kind of "step-by-step energy dissipation" component with different load sources and different energy dissipation mechanisms,which realizes the iteration and upgrading of traditional buckling restrained bracing members,and makes the performance of energy dissipation components more mature,stable and excellent.Based on the current research on energy dissipation and practical application of energy dissipation,this paper presents a multi-yield energy dissipation component,studies the stress mode and performance of multi-yield metal energy dissipation plate,and develops a multi-yield energy dissipation component which is suitable for small earthquakes and is in the elastic range.Firstly,the stiffness of metal energy dissipation plate is deduced by theoretical method,the proportion of shear and bending in energy dissipation is quantified,and the theoretical calculation formula is given.The analysis shows that the energy dissipation mode of metal energy dissipation plate is independent of its thickness.The theoretical deduction process in this paper is also applicable to other metal energy dissipation plates whose linear shape can be expressed by various available functions.The theoretical deduction process in this paper is also applicable to all kinds of metal energy dissipation plates whose linear shape can be expressed by functions.According to the actual engineering needs,the selection and reference of metal energy dissipation plate can be made,which can provide theoretical guidance for practical application.In order to verify the theoretical results,the stress and deformation of the metal energy dissipation plate were observed by finite element simulation and test,and the hysteretic curve of the finite element simulation was in good agreement with the true curve obtained from the test;the buckling and instability state of the metal energy dissipation plate was in good agreement with that of the finite element simulation,and the stress yield state of the single metal energy dissipation plate was basically the same as that of the theoretical formula.As a result,the buckling failure occurs about 60 mm away from the center of the plate,which also verifies the feasibility of finite element simulation.By establishing the same finite element model as the size and connection mode of the test component,the problem of more bolts,larger model and difficult convergence in the finite element simulation is solved.At the same time,the ultimate bearing capacity of the finite element simulation is within 6% of the test error,and the hysteretic curve of the finite element simulation is in good agreement with the test results,which verifies the rationality of the finite element simulation.Based on the previous results,through the calculation of a large number of finite element model examples,a kind of multi-yield seismic absorber with energy consumption and elasticrange is studied.It can solve the problem that the traditional buckling restrained braces are not easy to consume energy in small earthquakes.