Wind-Induced Effects Of Super High-Rise Buildings With Dampers Under Rare Wind Loads

For super high-rise buildings around the world,with the continuous increase of building height,the sensitivity of the building structure to earthquake action and wind load also gradually increases,so it is particularly important to study the response of buildings under the action of earthquake action and wind load.important.For a long time,earthquakes and wind loads have caused huge damage to building structures,and also caused huge loss of life and property to human society.At present,the research on the structural response of building structures under the action of earthquakes at home and abroad is very comprehensive.Scholars use different seismic methods,such as building seismic isolation,and the principle of energy dissipation and shock absorption,by installing different dampers,such as velocity dampers(viscous dampers,etc.),displacement dampers(such as metal dampers,etc.)etc.)the response of the control structure.However,in the coastal areas of our country,they are affected by wind disasters all the year round.When the wind speed is high,a large wind load will be generated,and at the same time,it will cause serious damage to the structure.Therefore,it is necessary to analyze the response of building structures that meet the seismic fortification requirements under rare wind loads.However,the research on wind load in the current code of our country focuses on the wind load with a return period of 10 years,50 years and 100 years.According to the calculation of the probability of transcendence,it is only equivalent to the small earthquake stage of the same level of earthquake action.However,in the world,Japan and other countries have been studying wind loads with different return periods for as long as 2000 years.Therefore,this paper predicts and estimates the magnitude of the rare wind load with a return period of 500 years,1000 years and 2000,which is still lacking in the code;Wind-induced effects of structures required for fortification;whether seismic dampers can ensure the safety of structural performance under rare wind loads.Its main contents are as follows:(1)This paper firstly tests and corrects the homogeneity of the original wind speed data,and uses the extreme value I-type distribution model and the independent storm method to predict the extreme value wind speed of the 500-year,1000-year and 2000-year return periods for the measured data.The results show that the extreme value I-type distribution prediction results of the annual maximum wind speed sampling are larger than those predicted by the independent storm method.(2)Numerical simulation and wind tunnel test are carried out for the studied model.Firstly,the numerical simulation of the selected super high-rise buildings is carried out,and the correctness of the simulation results is verified.Then the performance analysis of the structure’s response and performance under earthquake action is made.Then,two different seismic dampers were simulated to understand their mechanical properties,and different arrangements were used in the simulation.The wind tunnel test is carried out for the proportionally reduced rigid model,and the variation characteristics of the average and fluctuating wind pressure coefficients of the model are studied..(3)Using finite element software,respectively,under the action of normal wind(return period of 10 years,50 years,100 years)and rare wind(return period of 500 years,1000 years and 2000 years),the wind-induced effects of structures without dampers,structures with viscous dampers and structures with anti-buckling braces are simulated and analyzed.Firstly,the interstory displacement angle,vertex displacement,vertex acceleration and base shear force of different structures are analyzed.Based on the analysis results,the structural response of buildings that meet the seismic fortification requirements under rare wind loads is studied.It is analyzed whether the seismic damper can ensure the safety of the structural performance under the rare wind load.