Wind-resistant Design And Wind-induced Vibration Response Analysis Of Super-high-rise Structures Equipped With Liquid Viscous Damper

Super high-rise buildings have developed rapidly in China in recent years,because the super high-rise buildings have less occlusion,under the action of wind load,it will cause strong vibration at the top of the structure and cause discomfort to occupants.And only by increasing the mass of the structure itself to reduce wind-induced vibration will often greatly increase the economic cost,the vibration damping effect is not obvious,but also increase the seismic response,therefore,many wind-resistant energy dissipation shock absorbers have been applied in the engineering community,among which the well-known,more mature development is the tuned mass damper,in recent years,liquid viscous damper in the field of wind design has also been well developed,and compared with the traditional tuned mass damping,there are many advantages.Based on a 232 m super high-rise building in Zhuhai,this thesis uses finite element simulation to analyze the wind resistance design and wind vibration response of the super high-rise structure,and studies the different wind vibration control methods of the super high-rise structure.The main research contents of this thesis are as follows:1.Based on the background of a 232 m super high-rise building in Zhuhai,based on the linear filtering AR method,the Karman spectrum that changes with height is selected,and the programming software MATLAB is used to simulate the pulsating wind field around the engineering example in this paper,and the wind speed time history is obtained that is spatially related and applicable to the super high-rise building.Based on the finite element software ANSYS,the ICEM and Fluent modules in ANSYS realize the establishment of the grid model of the structure and the simulation of the wind pressure time history of different monitoring points on the structural surface in the pulsating wind field,and the wind load time history of each floor suitable for the wind vibration response analysis of super high-rise structures is obtained by further processing the wind pressure time history data by using the programming software MATLAB.2.2.Based on CFD numerical simulation data,the frequency domain method was used to evaluate the comfort of super high-rise buildings under wind load,and the influence of damping ratio on acceleration response was analyzed,and the wind load time history data obtained by numerical simulation was imported into the finite element software ETABS to conduct a time domain analysis of the wind vibration response of the structure,and compared with the frequency domain analysis results,the results showed that the analysis results of the two were basically consistent.The effectiveness and accuracy of the wind load response analysis obtained by numerical simulation are verified by importing the wind load time history into ETABS for wind vibration response analysis.3.Based on the wind load time history obtained by numerical simulation,under the action of the most unfavorable wind angle wind load time history,the vibration damping effect under different floor layout positions,different plane layout positions,different damping spring rates and different damping parameters of the liquid viscous damper damper was compared and analyzed,and the most reasonable damper layout was selected,and the wind vibration response of the top layer of the structure was effectively controlled and the vibration damping effect was obvious.4.Aiming at the problem of additional equivalent damping ratio recognition,the equivalent damping ratio is identified by three methods,and the identification results are verified,and the results show that the free vibration attenuation method and energy method are closer to the actual results,and the practical engineering feasibility and reliability are high.5.Comparative study of the acceleration response,displacement response and maximum interlayer displacement angle of the diagonal connection and lasso connection of TMD damping system and liquid viscous damper for wind vibration control.The results show that under the most unfavorable wind angle wind load,these three wind vibration control methods can effectively reduce the wind vibration response of super high-rise structures to achieve the purpose of vibration damping.Among them,the lasso connection has the best vibration damping effect;The diagonal connection scheme is second;TMD damping system solution with the worst vibration damping effect.