The Mechanical Properties Of TSBRB And Its Seismic Control Effect On Frame

This paper aims to the shortcoming of traditional buckling-restrained brace's lack of rigidity when it yield,put forward a kind of new steel damper that it can produce a reliable axial direction stiffness after the core has yield—Two stiffness buckling restrained brace,introduction its working principle,detailed structure and the characteristics of the stiffness change in stages,derived the material and geometry requirements of the support structure design should be satisfied.Tested the feasibility of the new damper through the scale model test.The characterstics of stress,energy dissipation,the characteristics of additional stiffiness and the characteristics of damage were studied.At the same time,the finite element software is used to model the experiental components.simulate the ststic loading process.By the time,in order to check the effect of the new damper on the actual vibration control of the structure,based on the American civil engineering association's benchmark steel frame structure,use the TSBRB or traditional BRB to reduce it's seismic response.The actual dampering effect of the new damper on the structure is verified.and analyzed the effect of start displacement on damping effect.The detailed work is as follows:(1)Designed and manufactured a TSBRB specimen,repeated loading of tension and compression test,studied the carrying capacity,stiffness variation characteristics of the specimens,hysteresis curves,skeleton curves,ductility and cumulative plastic deformation capacity,energy dissipation ability indicators,such as analysis of the failure mechanism of the specimens,find out the weak parts of the specimens and improvement measures are put forward.The hysteretic curves and skeleton curves obtained in the experiment are all in accordance with the expected shape,and the hysteretic curves are symmetrical and full,and have obvious second-order stiffness characteristics.(2)Finite element software abaqua is adopted to establish the solid finit element model of the specimens,fully considering the geometric,material and nonlinear contact,and to simulate the loading process of quasi static test,the result was compared with the test.Finite element simulation result is consistent with the test results of law.(3)Establish adopts double buckling constrainet support stiffness damping design of steel frame structure finite element model of damper using equivalent simplified model,through the method of nonlinear time hietory analysis was veritied by actual shock absorption effect of damper.TSBRB to control the seismic response of the structure no matter from the peak response of the structure,the response distribution uniformity,or the residual deformation of structure after the earthquake,is superior to traditional buckling restrainted brace;When the seismic action is small,the early start of the second stiffness can provide additional stiffness for the structure as early as possible,which is beneficial to the control of the seismic response of the structure.When large earthquakes or plate inner core strength,stiffness is relatively weaker,the late start a second stiffness is more advantageous to provide enough yield deformation space for outer core board,is helpful to reduce the structural damage.