Study On Wind-Induced Vibration And Passive Air Suction Flow Control Of High-Rise Buildings

With the wide use of high-strength and light-weight materials and the emergence of new structural systems,the height of modern building is higher and higher and the damping ratio is smaller and smaller,so the high-rise buildings are lighter and more flexible,making their natural frequency close to the natural frequency of natural wind.Therefore,High-rise buildings are more and more sensitive to wind loads,thus making the wind-induced vibration response of tall buildings increasingly become an urgent problem of safety and durability of structure.In this paper,firstly,the gas-solid coupling of high-rise building was simulated by CFD.By analyzing the wind-induced vibration characteristics of the structure and the flow field characteristics along the height,the optimal location of the passive jet rings was obtained.Based on the results of CFD,a passive suction air flow control method for wind-induced vibration of high-rise buildings was proposed.In the wind tunnel experiment,the acceleration sensor was used to measure the vibration response of the high-rise building test model.Based on the six-component balance,the overall wind loads of the test model were measured.At the same time,the particle image velocimetry system(PIV)was used to measure the flow field around the test model quantitatively.By changing the different layout Parameters(arrangement distance,arrangement position and height of the hole of the passive jet rings),this paper investigated the control effect of wind-induced vibration under different control parameters.Finally,the control effect of suction perforated pipe on wind-induced vibration under different wind angle was studied.The test results showed that the passive jet rings formed air suction channel on the structural,which destroy the unstable vortex shedding of the wake field through the structural wake blowing,so as to reduce the average wind loads and fluctuating wind loads on the surface thus achieving the purpose of suppressing wind induced vibration.The smaller the distance between the jet rings,appropriate height and the closer the arrangement position was to the top can make the passive suction perforated pipe achieve very great control effect.Under the optimal control condition of passive jet rings,the displacement response can be reduced by about 90%.