Study On Wind Resistant Performance Of High Rise Buildings With Seismic Isolation Devices

with the development of China's economic level and technological innovation of building construction technology,a large number of high-rise buildings have been built in the first and second tier cities,which plays a pivotal role in the construction of a new modern city.The Wind load is one of main factors in load-controlling of high-rise building,it can cause the phenomenon of vibration,resulting in the effects of large residual deformation,cracks,fatigue damage of components,and discomfort of human body.In this paper,according to the wind load time history of high-rise building,the MATLAB program is compiled by AR method,and the wind load time history curve is obtained.ANSYS software is used to analyze the wind resistant performance of high-rise building with isolated buildings and dampers,and the wind resistant effect of isolated bearing,the wind-induced vibration response of isolated building,the response parameters of wind vibration,the wind-induced vibration response and the response parameters of wind induced vibration are studied.The main work and achievements are as follows.(1)The Davenport wind speed power spectrum is selected,and the MATLAB calculation program is compiled by AR method,and then the wind speed time history curve,the wind pressure time history curve and the wind load time history curve are obtained.The wind load time history curve can be used to calculate the wind load into ANSYS software by APDL language,and the calculation steps and stability conditions of dynamic time history are given.(2)The seismic and wind resistant performance of the isolated bearings are analyzed,the peak acceleration of the structure is reduced by more than 40% under the action of seismic wave and the displacement response of the structure increases obviously under the action of wind load,which illustrate that the seismic isolation effect is good,under the action of seismic wave,and the vibration isolation effect is not obvious under the wind load.(3)Taking Spandrel beam and column spacing,damping ratio and damping bearings as variables,and wind induced response of different models have been analyzed.The results show that: Increasing the skirt stiffness can reduce the displacement and acceleration response of the structure,but it is not a moreeconomical measure;increasing the damping ratio can improve wind-induced vibration of the structure,to a certain extent;increasing the damping ratio of isolation bearings can't reduce the wind-induced vibration response of the structure.(4)With the fact that the displacement response,acceleration response and inter story deformation of the structure are reduced obviously,it demonstrates that it is a good way to control the wind-induced vibration response by setting dampers.Through analyzing the wind-induced vibration responses of the structure under different window beam,different damping coefficient,different bracing stiffness and different layout schemes of dampers,it shows that: Increasing the height of spandrel beam can improve the wind-induced vibration response of seismic-isolated buildings with dampers;it's not true that the higher the damping coefficient or the height of spandrel beam are,the better it will be for controlling the wind-induced vibration response.How to optimize the way to choose parameter should be studied further.And although different setting plan of dampers can cause significantly different effects on control of wind-induced response of the structure,we usually follow a law that the more dampers we put into use,the better effect we will have.