The Analysis Of Viscous Dampers Impact On Anti-seismic Performance Of High-rise Structure Under Action Near-field Earthquake

Compared with the common non-near-field earthquake excitation, the near-field earthquakes because of its long-period pulse of the role of speed, will be more strongly on the structure of velocity and displacement of the impact of the disaster to the city is also very heavy, so in order to ensure that the structure in the near-field seismic stability of the structure of the system has set a higher strength and deformation demands, encourage us to improve the seismic performance of the overall structure. Control the dynamic response of the structure inspired by wind loading or seismic loading can effectively reduce the dynamic response and destruction of the structure inspired by the external loading excitation, can effectively improve the structure's ability to resist disasters, disaster reduction at the time of the heavy casualties.Used as passive control a wide range of energy dissipation compared technology without additional energy, in the role of strong earthquakes, the energy dissipation devices to enter the first non-elastic state, a large number of consumption structure of energy input to the main structure to avoid the larger non-elastic deformation, and the rapid reduction of structural dynamic response.Excellent energy-damping technology,reliable performance makes it practical engineering applications in much concern has been to promote the use of in many countries.Fluid viscous dampers used its excellent stability, performance and ease of installation and other technologies in the field of energy dissipation to show their talents have been in many key projects to promote the use of vibration reduction is very obvious. In this paper, fluid viscous dampers as the main energy dissipation devices, to study the mechanism of energy dissipation and its role in the near-field earthquake complex under the damping effect of high-rise steel structures. The main research contents are as follows:(1) First of all, described in detail the characteristics of near-field ground motion as well as the security status of near-field earthquake, followed by detailed and time-history analysis of seismic waves input selection and synthesis of artificial seismic waves, seismic waves through the handling of Wenchuan details of the selected seismic processes, requirements in line with the site through the synthesis of artificial wave on wave theory and the process of synthesis. (2) Introduced the structure of viscous dampers and mechanical models, in practice it can be simplified with the speed, damping and speed of index a the Maxwell model. From power balance and energy balance analysis of the viscous damper set-up the structure of the energy principle. Pointed out that after the viscous damper settings should be based on the structure of multi-degree of freedom non-linear system to solve the given nonlinear time history analysis method.(3) Analysis of the viscous damper parameters on the self-damping effects; given the various parameters to determine the practical application of the method;at the same time an analysis of viscous damper on the location and quantity of the effect of vibration.Finally,given this paper a practical design method for building structural models Morgan charged with control of the simulation analysis,before and after carried out a viscous damper settings were checked and controlled contrast control check results show that: the structure of the seismic response control good, reaching the desired results,which also shows the viscous dampers for improving the seismic performance of the importance of the structure.