The Hysteretic Performance Analysis And Application Research Of Open-hole Anti-buckling Restraint Support

As a kind of energy dissipation component,buckling restrained brace has been widely used in engineering because of its excellent energy diss ipation performance and convenient fabrication method.With the continuous improvement of technology,steel plate as the core and concrete as the restraint can not meet the needs of people.Based on the design concept of "partial weakening is equivalent to overall strengthening",on the one hand,it can make the core components yield more easily and enhance the energy consumption effect of the overall components.On the other hand,by specifying the failure location,the core components have the function of locating the failure,which solves the problem of uncertain failure location of the core components.In this paper,the working principle of buckling restrained braces is deeply understood,the finite element analysis model of all steel zigzag buckling restrained braces is established,which is verified by the existing literature test data;the parameter analysis of energy consumption performance of open-hole buckling restrained braces is carried out,and the engineering application research is carried out,and the results are as follows:(1)When the opening is small,the shape of the hysteretic curve of the buckling support is basically the same,but the bearing capacity is weakened to a certain extent;with the increase of the opening width,the equivalent plastic strain measured by the opening increases gradually,and the bearing capacity will decrease slightly,and the difference caused by the opening width will become more significant with the accumulation of damage;if the opening is improper,it may be easier Fatigue fracture occurs.(2)To ensure a certain weakening and a considerable bearing capacity is a better scheme to achieve "fixed-point failure" opening.The opening rate of the section can reach a better effect at about 30%,if less than 6%,the effect is not obvious.After opening,the stress around the hole will increase,and the range of this area does not increase with the increase of the length of the rectangular hole;when the opening rate of the section is less than 40%,the first area to enter into the buckling is the end area.With the increase of opening rate and opening length,the short plate or long plate formed after opening is more prone to buckling.(3)Compared with the original frame,the free vibration period of F-BRB-1 and F-BRB-2 is significantly reduced.When the F-BRB-1 is adopted,the maximum displacement of the structure is less than that of the original frame 24.8% WhenF-BRB-2 is adopted,the maximum displacement control rate of the structure reaches23.5% ?(4)The results show that the control effect of the buckling brace on the top floor displacement under different seismic waves is not the same,among which the effect on San Fernando is not obvious,but on El Centro wave and Taft wave is good,reaching 19% ? 50%;the variation law of the top floor acceleration under different seismic waves is opposite to the displacement.Whether the short span single oblique layout or the large-span herringbone layout is adopted,when the layout is in the same layer,if the diagonal direction of the support is the same,the energy consumption curve under the earthquake action is very similar;when the direction of the support is different,the energy consumption curve of the anti buckling support under the earthquake action will be significantly different.