The Application Of The Viscous Dampers In High-rise Buildings

The application of nonlinear viscous dampers covers more and more areas in practical engineering,however,for the ultra-high-rise buildings the data of nonlinear viscous dampers on seismic and wind resistance is still deficient.It is a highly complicated process to simulate the fluctuating wind pressure time history curve and analyze the wind vibration time history,thus it hinders the application of viscous damper in ultra-high-rise buildings to some extent.Meanwhile,determining the additional damping ratio is the key to design the damping structure calculation.However,the calculation method for ultra-high-rise long-term structure directed by the regulations is not accurate enough.In order to promote the application of viscous dampers in super high-rise buildings,some breakthroughs have been made in this article.At the beginning,the article introduces an analysis of a long period structure using the standard calculation method,which shows the energy dissipation of additional damping ratio has a greater degree of partial consumption and is not conducive to the safety of seismic design.Since the calculation process is relatively complicated,it needs to be further revised and simplified.And during the designing period,the designer should be cautious enough.After comparison of the additional damping ratio results calculated by the energy ratio method,the response attenuation method and average damping coefficient method,we come to a conclusion as follows.The response attenuation method is of high precision,but the process is relatively complicated.The average energy ratio method and damping coefficient method are simple and can satisfy the requirement of accuracy used for calculating the reduced damping dissipation structure of a long period earthquake.Meanwhile the average coefficient method is generally more conservative than the energy ratio method,it is more conducive to the safety of the structure.It overcomes the character of uneconomic showed by average shock absorption coefficient method and is suitable for designers to promote the use of.The damping coefficient method is too conservative,which is not recommended since it is not economic enough.Through analysis of the contrast of a high-rise frame core wall structure,the nonlinear viscous damper under small earthquakes can dissipate a large number of seismic energy,providing some additional damping ratio,which effectively reduces the displacement between stories,shear force and acceleration of the top frame andthe column axial force.It can significantly reduce the damage of the structure under rare earthquake and protects the structure effectively.Using ETABS to simulate the time history of fluctuating wind pressure of 50 years and 10 year return period and put them into ETABS to conduct the wind-induced response analysis.We find that the damping structure can significantly improve the damping ratio under wind vibration response.The 50 year and 10 year return period wind load were increased by 0.06 and 0.051,and the hysteretic curve of the damper is fluent.It dissipates the wind energy efficiently and significantly reduces the structural floor displacement,shear force and acceleration of the top.It significantly improves the wind sensitive comfort degree of high-rise buildings under wind vibration.