| Energy dissipation(vibration)is to reduce the displacement of the structure,improve and improve the deformation performance of the structure,and obtain better living comfort by reasonably arranging energy dissipation components in the structure to consume the wind vibration energy and most of the earthquake energy input to the structure.In this paper,taking a high-rise tube in tube steel structure as the engineering background,energy dissipation and vibration reduction(vibration)are studied.The main contents are as follows:(1)This paper expounds the basic principle of structural energy dissipation and vibration reduction,compares the advantages and disadvantages of three analysis methods of energy dissipation and vibration reduction structures,introduces four calculation methods of additional damping ratio,and verifies the applicability of the time history analysis method with the calculation example of 4-story steel frame in related literature.On this basis,an 11 story steel frame model is established to verify the reliability of the energy ratio method applied to the calculation of additional damping ratio,and the parameter analysis is carried out.Compared with the basic structure,the floor displacement,the inter story displacement angle and the floor shear force of the structure with dampers are significantly reduced under the earthquake.Compared with herringbone damper and diagonal damper,the analysis shows that the former is better.Compare the damping effect when the damping index is 0.1,0.3 and 0.7 respectively.The calculation shows that when the damping index is taken as different values,the floor displacement,inter story displacement angle and floor shear force of the energy dissipation structure have large differences.When the damping index is taken as about 0.3,the vibration reduction effect is better.(2)Taking a high-rise tube in tube steel structure as the engineering background,using ETABS analysis software,three kinds of structural models are established,namely,basic structure,structure with buckling restraint and structure with damper,and the effects of frequent earthquake,fortification earthquake and rare earthquake of the three are compared and analyzed.The viscous damper can provide additional damping ratio for the main structure,so it can effectively reduce the seismic response.The additional damping ratio provided by the damper to the main structure under the action of fortification earthquake is less than that under frequent earthquakes.Under frequent earthquake action,compared with the basic structure,the peak acceleration of the top floor of the structure with dampers decreases by 13.97%,and the corresponding value of the structure with buckling restraints increases by 5.4%.Compared with the structure with buckling restraint,the floor displacement and inter story displacement angle of the structure with dampers can be better controlled under frequent earthquakes,and the stiffness of the floor structure does not change abruptly.Under the rare earthquake,compared with the basic structure,the plastic displacement angle between floors of the energy dissipation structure can be reduced to varying degrees,and the control effect of the plastic displacement angle between floors of the structure with dampers is better.In addition,in the static elastoplastic analysis,the number of plastic hinges of structures with dampers is the least,and the distribution locations are more concentrated in the bottom floors.(3)The autoregressive model of the linear filtering method is used to simulate the wind load time history curve,which is imported into the ETABS analysis software as a time history function.The three structural models established in Chapter 3 are used to analyze the windinduced vibration response of the energy dissipation components on the premise that the relevant information of the energy dissipation components remains unchanged,and further evaluate the effect of the energy dissipation components on the structural wind vibration control.Under the action of wind load time history,the damper structure can provide a large additional damping ratio,and the damper force displacement curve is full,which can effectively dissipate wind vibration energy.Compared with the basic structure,the energy dissipation structure can reduce the floor displacement and the inter story displacement angle,and the reduction of the structure with dampers is more significant.Compared with buckling restrained braced structure,damper structure has better control effect on peak acceleration of wind-induced floors. |
