| With the accelerated development of urbanization,the rational use of land resources is becoming increasingly important.High-rise structures can effectively use space,reduce floor space,and improve land utilization,but as the height increases,the influence of the structure under wind load and earthquake also increases.In order to solve such effects,a tuned mass damper(TMD)is generally arranged on the top layer of the structure to improve the wind and seismic performance of the high-rise structure.TMD is mainly composed of mass block,spring and linear viscous damper,by designing the appropriate mass,stiffness and damping coefficient,adjust the natural frequency of the mass to approach the control frequency of the main structure,when the structure is excited by vibration,the inertial force generated by the mass will mutually suppress the vibration of the structure to achieve the effect of shock absorption.However,TMD structure is complex,there are difficulties in maintenance and replacement,and high construction cost,so in order to overcome the above shortcomings,this paper designs and proposes a TMD-like shock absorption system composed of recoverable C-shaped shell as the core component.By using a steel tape measure equivalent to replace the C-shaped shell as the core component of the model seismic isolation layer,the shock absorption effect of the TMD-like damping system composed of the C-shaped shell as the core component is verified,and the main work is:(1)The mechanical properties of C-shaped shell steel column and steel tape measure were explored,the production process,resistance test and axial pressure test of C-shaped shell were introduced,and the shaking table test of the C-shaped shell seismic isolation layer of the steel tape measure was carried out to obtain its anti-side stiffness and other vibration parameters.(2)Design a six-layer steel frame structure,according to the similar theory,the "6+1" model,"4+2+1" model,steel frame with different stiffness and seismic steel frame scale structure containing tape measure seismic isolation layer are designed,the model is subjected to a shaker test,and the shock absorption effect of the seismic steel frame structure model and the steel frame structure model with seismic isolation layer are compared.The results show that the dynamic response of the steel frame structure with the C-shaped shell as the seismic isolation layer is significantly reduced.(3)Using ABAQUS finite element simulation software,the original seismic steel frame structure and "6+1" model corresponding to the test model are constructed,and the dynamic action is input to analyze the dynamic and modal analysis.According to the results obtained compared with the data and phenomena of the shaker test model,the reliability of the model test is verified,and the feasibility of TMD-like damping structure composed of C-shaped shell seismic isolation layer in steel frame structure is explored.According to the research results,it is found that the TMD-like structure using Cshaped shell components as the isolation layer has obvious shock absorption effect.Under different structural stiffness,the shock absorption structure can play a shock absorption effect,and has a good shock absorption effect in the case of large earthquakes. |
