The Seismic Performance Research And Application Of A New Type Of Triangle Section High Efficiency Energy Dissipation Brace

Because of its sudden,instantaneous and highly destructive,earthquake disaster poses a great threat to the safety of building structures.Although the use of ductility structure can effectively reduce the impact of the earthquake on the structure,it still causes considerable damage to the main structure.The emergence of anti-buckling energy-consuming support effectively reduced the degree of structural damage during earthquakes.Scholars at home and abroad have carried out a lot of research on it and successfully developed various forms and distinctive features of buckling restrained brace.However,to this day,there is still a problem to be improved in the buckling restrained brace that has been released.To improve this series of issues,inspired by the measures taken by Professor Zhou Yun and others to weaken the brace core to change the stress distribution and improve the mechanical properties,this paper combines the structural characteristics of metal dampers,steel shear walls with slits and buckling restrained brace,a new type of triangle section energy dissipation brace is proposed and its mechanical properties and energy dissipation performance are analyzed.and hope that the research results of this paper can provide theoretical support for future research and design.In this paper,the stiffness,bearing capacity and the shape of energy dissipation coupling beam of triangle section energy dissipation brace with triangular section are analyzed theoretically,supporting factors such as the weakening ratio of energy-consuming coupling beams,height width ratio,opening length ratio,and width thickness ratio are extracted from the theoretical formula.Using ABAQUS finite element software to perform static analysis and hysteresis analysis on the triangle section energy dissipation brace,the influences of parameters such as the weakening ratio of the energy-consuming coupling beam,aspect ratio,opening length ratio,and width-thickness ratio on the brace stress distribution,bearing capacity,deformation capacity,and energy consumption capacity are obtained.Combined with the results of static analysis and hysteresis analysis,this paper suggests that the weakening ratio of energy-consuming coupling beams should be 87.5%,the height width ratio should be 30%,the opening length ratio should be 2.54%,and the width thickness ratio should be 10.In order to avoid the plastic hinge in the middle of the energy-consuming coupling beams,the weakening ratio is not easy to be less than 50%;in order to ensure that the brace neck will not have excessive deformation,the height width ratio should be avoided to take 40% or more,and the opening length ratio should be avoided to take 2.42% or less;in order to ensure that the brace yield displacement remains at a low level,the height width ratio should be avoided to be less than 10.SAP2000 software is used to analyze the seismic effect of the structure strengthened by triangle section high efficiency energy dissipation brace.Because the original structure does not meet the seismic code requirements,by comparing the periodic information before and after the reinforcement of the structure,and the inter-layer displacement angle under the action of frequent and rare earthquakes,it is found that:The use of The triangle section energy dissipation brace to strengthen the structural cycle type and the inter-layer displacement angle can meet the requirements of the code,In the case of frequent earthquakes,it shows better seismic performance than a kind of buckling restrained brace.It shows that the triangle section energy dissipation brace can effectively improve the seismic capacity of the structure.