Mechanical Performance Analysis And Parameter Optimization Of Annular Shear Perforated Mild Steel Damper

With the development of seismic design theory of civil engineering structures,passive energy dissipation technology is widely used in seismic design of engineering structures.Metal mild steel damper has been widely designed and researched by domestic and foreign scholars as a kind of damper with excellent energy dissipation performance,it is found that the plastic distribution of the rectangular shear plate damper is uneven under the action of shear force and the stress concentration around the damper is easy to occur.In this paper,a new type of annular shear perforated mild steel damper is presented,which is special in that it is made of circular steel plate with holes in the steel plate to improve the existing research.The main research contents and conclusions of this paper are as follows:(1)Establish the numerical model of the damper by the finite element software ANSYS,and the rationality of the structure design of the damper is verified by numerical analysis and comparison,the results show that the hysteretic behavior of the rectangular plate damper with the same material is the same as that of the circular plate damper,but the stress distribution of the circular plate damper is more reasonable,which can effectively solve the problem of stress concentration around the corner of the rectangular plate The mechanical properties of the energy dissipation steel plate of the damper are not obviously reduced after the opening,and the stress distribution of the damper is obviously improved.Therefore,the opening of the energy dissipation steel plate of the damper can make the stress distribution on the energy dissipation steel plate more uniform,the plastic utilization ratio is higher;(2)Four kinds of ASPD dampers with different openings are designed,and the thickness of steel plate,the number of openings and the size of openings are taken into account to simulate the dampers and analyze the influence of the mechanical properties of the dampers on the parameters,the results show that the hysteretic curve of annular shear perforated mild steel damper is full and stable,the yield displacement is small,and the energy dissipation performance is good The mechanical properties of the damper increase with the increase of the thickness of the steel plate and decrease with the increase of the opening ratio.Moreover,the mechanical properties of the damper with circular opening are better than those with other openings.(3)An optimal design method based on Kriging surrogate model is proposed,in which the circular open-hole damper is taken as an example,the geometric parameters of the damper are taken as design variables,the energy dissipation performance is taken as the optimization objective,and the total material consumption is taken as the constraint condition,the results show that there is a good agreement between the predicted response values of the Kriging model and the response values of the finite element software,the correlation is not less than 0.95,which shows that the surrogate model has high precision,the energy dissipation performance of the damper is improved by 6.2%,and the total material consumption is reduced by 5.4%,which not only improves the performance of the damper,moreover,the cost of the damper is reduced,and the effectiveness of the optimization design method based on Kriging proxy model is proved once again.Figure[46]Table[19]Reference[54]...