Study On Three-dimensional Metal Dampers With Long-Span Space Isolation Structure

Earthquake is destructive to structures,so an investigation in the damping control in structure engineering is important.Installing the energy dissipation devices in the structure is a safe and effective way of damping control,which can significantly reduce the earthquake energy and protect the structure.A hysteretic damper is widely used in engineering projects owing to its availability,easy production and installation,low cost,and replaceability.However,the hysteretic damper currently is only applicable to the damping control of one-dimension and two-dimension directions;it cannot be applied to some long-span-and-space structures with multi-dimentional seismic response.Therefore,this project studies a three-dimensional mental damper based on the traditional one,and investigates the effect of its damping control.The project analyses the parameter effect of the three-dimensional mental damper and studies its damping control effect in the long-span-and-space structures on the finite element software ABAQUS.The procedures and results of this project are as follows:(1)A three-dimensional mental damper is designed based on the traditional U-shape hysteretic damper.The parameters of the new damper components are analyzed on ABAQUS.With the width,thickness,bend radius of the S-shape and U-shape steel changed,the researcher explores the rules of the influence of parameter variations on the stiffness,yield strength,and resilience performance of the damper.(2)The energy consumption coefficient of a single three-dimensional damper is effectively evaluated,the results show that the equivalent viscous damping coefficients of the three-dimensional damper in all three directions are all above 0.3,and the three-dimensional damper has good three-dimensional energy dissipation capability.(3)This thesis will be focused on the applied research of three-dimensional mental damper in spatial latticed structure.Simulated analysis will be done on latticed structure installed with three-dimensional mental damper.With the input of three-way EL-Centro wave,TJ wave and artificial wave,vibration damping performance of this structure will also be separately studied in moderate and major earthquake.It is also compared with the structure under the uncontrolled situation,which demonstrates that three-dimensional mental damper has better vibration damping performance.(4)Considering the initial stiffness of the three-dimensional metal damper and the effect of initial stiffness,the damping control of the two structures are studied respectively,the results show that when considering the initial stiffness,the damping effect on node acceleration and node displacement is obvious;when the influence of initial stiffness is not considered,the effect of dampers on the rod control is obvious.when the three-dimensional metal damper has the same maximum damping force as the traditional viscous damper,the damping effect of the traditional viscous damper and the three-dimensional metal damper are compared.The results show that the damping effect of the two kinds of damper is equivalent to that of the structure.