Study On The Damping Performance Of Fan-Shaped Rotating Amplifying Joint Shear Dampers For Structures

In view of the phenomenon that the beam-column joints of the building structure enter into obvious plastic state under the action of earthquake,which leads to the structure failure or collapse,the ability of improving the seismic performance of the structure is studied based on the design of a fan rotating amplifying joint shear damper.In order to make use of the energy dissipation damping technology of the fan rotating amplifying joint shear damper to be applied as soon as possible,the technology development and research work of the damper are carried out,and the key problems of engineering design and application are solved.According to the new fan rotation shearing damper is amplified node,this paper introduces the structure of the damper,the main energy consumption materials for rubber,namely through the shear deformation of hysteretic energy dissipation of rubber material,the fan rotation shearing damper can be amplified node structure and outer loads will beam-column node or structure layers generated according to the need for a relatively small displacement amplification,achieve better energy dissipation effect,thereby enhancing the overall structure of the seismic performance.The damping force formula is derived by analyzing the energy dissipation principle of the damper.According to the structural characteristics of the proposed fan-shaped rotary amplifying joint shear damper,the finite element numerical simulation analysis was carried out with ABAQUS software,and its working performance,energy dissipation performance and structural stress distribution were determined through the numerical simulation results,and the skeleton curve was extracted by analyzing the results of hysteretic curve.Results show that the fan rotation shearing damper hysteresis curve are amplified and hysteresis loopback envelope area is larger,with a stable hysteretic performance,energy dissipation capacity,large deformation and internal stress distribution is more even,no obvious characteristics of stress mutation phenomenon,make full use of the viscoelastic material(rubber)shear deformation of hysteretic energy dissipation mechanism,the fan rotation shearing damper skeleton curve are amplified the change trend of similar to the stress-strain curve of rubber material,fan rotating zoom type node shear damper mechanical model mainly depends on the mechanical properties of rubber materials.By comparing with the hysteretic curve of the traditional fan-shaped lead viscoelastic damper,it is proved that the fan-shaped rotary amplifying joint shear damper can ensure that the beam and column joints of the structure can dissipate energy under small deformation,which is more practical.On the basis of the finite element simulation study of the damper,the fan-shaped rotary amplifying joint shear damper is applied to the reinforced concrete frame structure to form the energy dissipation structure.The ABAQUS software is used to make a comparative analysis of the original structure and the structure with fan-shaped rotary amplifying joint shear damper.The results show that: Under the seismic action,with the fan rotation amplified node shear damper structure compared with the original structure of the interlayer displacement Angle,top displacement and base shear,etc,have certain control,interlayer displacement Angle decreases about 13.88% on average,the top floor displacement decrease average around 13.93%,the decrease of the base shear average is around 16.42%,the fan rotation amplified node shear damper's energy dissipation effect is good.In addition,the hysteretic curves of the fan type rotary joint shear damper and the traditional fan type lead viscoelastic damper are compared and analyzed.In a word,the damper is simple in structure,easy to make and install,stable in operation,durable and easy to maintain in the later period.