Seismic Performance Analysis Of Steel Frame With A Perforated Plate Buckling Constraint

In recent years,with the gradual improvement of people's seismic fortification requirements,buckling constrained support as a new type of damping member has the advantages of high rigidity,strong energy consumption,and no buckling under compression.However,due to the uncertainty of its yield position Many fractures occur at the end of the support.For this reason,many scholars have proposed to make holes in the support to achieve the purpose of yielding at a fixed point and protecting the end by actively weakening the cross section.In this paper,based on the calculation theory of the opening plate buckling constrained support proposed by the former,a support model consistent with the steel frame example in the article is designed,and the finite element analysis software ABAQUS is used to perform a single test on 6 sets of support cores with different opening ratios The simulation results of loading and cyclic loading are compared and analyzed.The results show that: under the condition of the same degree of weakening of the cross section of the supporting core,when the longitudinal opening rate of the support is too low,the performance of hysteretic energy consumption is similar to that of the unopened support Poor;when the longitudinal opening rate of the support is too high,the stiffness is degraded;when the longitudinal opening rate of the support is in a moderate range,the opening first yields energy and has good hysteresis performance.Then take the longitudinal section of the steel frame,add ordinary plate support,non-perforated plate buckling constrained support and perforated plate buckling constrained support respectively,and use ABAQUS to perform stress simulation analysis on the four groups of steel frame structures.The comparison results show: no support The frame structure has low bearing capacity and poor hysteresis capacity;the steel frame with open-hole plate buckling constrained support not only improves the shortcomings of the stress concentration at the end of the ordinary plate-supported steel frame,but its bearing capacity and stiffness are significantly improved;As far as the orifice-type supporting structure is concerned,it can enter the yield stage in advance to protect the main structure.Finally,the article uses ETABS to analyze the elasticity of common steel frames,ordinary plate D-type eccentrically supported steel frames,perforated plate type buckling constrained D-type central support steel frames,and open-hole plate type buckling constrained D-type eccentrically supported steel frames under frequent earthquakes.And the elastoplastic time history analysis under rare earthquakes,the results show that the pure frame structure system is relatively soft and the bearing capacity is weak.When the remaining three groups of structures are in the elastic stage,the effect of the buckling constrained support andthe ordinary support is not very different,and they provide lateral rigidity for the overall structure;after entering the elastoplastic phase,the displacement value of the buckling constrained support steel frame,Acceleration values have been significantly reduced,especially the buckling constrained support D-type eccentrically supported steel frame with the assistance of energy dissipation beam section,which provides higher rigidity and strength for the structure on the basis of controlling the lateral displacement of the structure.Outstanding seismic performance.