Research On Wind-induced Vibration Control Of Long Cantilever Viewing Platform With Super High-rise Structure

In recent years,with the continuous advancement of building materials and construction technology,people are no longer satisfied with the needs of building functions,but also pay more attention to the appearance of buildings.In order to realize the expectation of the building itself,the super high profile structure has become an important part of the structural design.However,it brings huge challenges to the structural design itself,especially the problem of earthquake resistance and wind resistance in the long cantilever part of the super high-rise irregular structure,which seriously threatens people's life and property safety.However,at present,the study on the dynamic response of long cantilever sections of super-high-rise structures under wind load is still relatively lacking.Therefore,it is necessary to carry out the study on the dynamic response analysis and vibration control of long cantilever viewing platform with super high-rise irregular structures under the action of wind loads.In this paper,based on the long cantilever viewing platform of Haiyi Hotel in Jiangmen City and the cantilever platform for sightseeing in Zhaoqing Hotel,the dynamic characteristics and vibration control of the platform under wind load are analyzed.The Long Cantilever Viewing Platform of Haiyi Hotel belongs to the National Natural Science Foundation of China,“Study on Control of Wind-induced Vibration of Long Cantilever Torsional high-rise Buildings”(item number: 51578434).The contents and results of the research are as follows:(1)Based on the wind tunnel test,this paper studies the dynamic characteristics of the Long Cantilever viewing platform of Haiyi Hotel under wind load.First,the time history data of the surface pressure of the rigid manometric model in eight different wind directions is measured,and the average wind pressure coefficient at each test point is deduced;the dynamic response of the long cantilever viewing platform at eight directions is measured by the aeroelastic model test,and the comparative analysis showed that the most unfavorable wind angle was 0 degree wind angle.(2)The structural dynamic response and natural frequencies of the ANSYS finite element model under the wind load which is based on the design data are compared with the wind tunnel test model,prove that the structure ANSYS model and the actual structure are more consistent,and the ANSYS finite element model can reflect the dynamic characteristics of the actual structure under wind load.(3)Based on the structural dynamic equation,the numerical analysis confirms that the acceleration response of the Long Cantilever viewing platform of Haiyi Hotel at the most unfavorable wind angle exceeds the vertical comfort limit specified in the specification,so the nonlinear viscous dampers are used for vibration control;By comparing the damping control effect of viscous dampers with different damping coefficients and different velocity index,the parameters of the nonlinear viscous damper and the effect of vibration reduction are determined.(4)In this paper,the finite element model of Zhaoqing Hotel was established through ANSYS software.Based on the linear filtering method,an auto-regressive model is used to consider the three-way correlation of the simulated points in the spatial structure,the wind load on the whole building is simulated in Zhaoqing Hotel,and it is determined by numerical calculation that the most unfavorable position of the roof sightseeing cantilever platform exceeds the specification comfort limit value.The viscous damper is used for wind vibration control to meet the specification comfort limit values.