Real Time Hybrid Of The Wind-induced Vibration Effects On Tall Buildings With FPS-TMD System

With the development of science and technology in building and material in recent years,tall buildings are built with more height,more slenderness,small damping,light weight and high strength materials.The natural frequency of tall buildings are more close to the fundamental frequency of strong wind,thus they are extremely sensitive to wind load.The wind-induced displacement and accelerations of tall buildings are sometime so large that the wind loading is the controlled factor for the structural design of these tall buildings.In order to control the excessive dynamic responses of tall buildings under strong wind loading,theoretical analysis and real-time hybrid test by small shaking table are conducted in this thesis for investigating the wind-induced vibration control efficiency of buildings with FPS-TMD system.The main work of this thesis includes the following aspects:The dynamic equation of tall building with FPS-TMD system under wind loading is established and deduced,the state space method is adopted to solve the dynamic equation,and the wind-induced displacement and acceleration of tall buildings can be obtained.Taking the wind-induced vibration control benchmark model of a 76-storey reinforced concrete tall building as an example,the time histories of fluctuating along-wind loading were simulated by the harmonic superposition method and quasi-steady hypothesis.The time history of acrosswind loading were selected from the existing wind tunnel test data.The efficiency of windinduced vibration control for this tall building with FPS-TMD system was numerically evaluated under various loading cases.The effect of different mass ratio,slideway friction coefficient of FPS-TMD system and damping ratio of main building on the control efficiency of the supplemental damping system were invetigated.The physical modeling and the similarity scale effect between the prototype and scaled model involved in real-time hybrid test on FPS-TMD system were investigated by the small electrical shaking table.The overall configuration of real-time hybrid test in the hardware and software environment and its main implementation procedure were described for the evaluation in the wind-induced vibration response of tall buildings with FPS-TMD system.A real-time hybrid test program of tall building with FPS-TMD system under wind loading is developed by compiling the MATLAB/Simulink numerical simulation model in the dSPACE developing system.The numerical simulation results from the MATLAB/Simulink program are compared with those numerical results from the existing state space method.Thus the verification of the MATLAB/Simulink program was conducted.In the real-time hybrid test,the time histories of wind loading with 10 and 50 year return period were adopted in this paper.Meanwhile the effects of the different damping ratios of main structure and mass ratio of FPS-TMD system on the test results of the real time hybrid test were evaluated comprehensively.The wind-induced displacement,velocity and acceleration atop of the tall building obtained from the real-time hybrid test were extracted and compared with those results from the numerical simulation analysis.The comparative results between the theoretically numerical analysis and the real-time hybrid test on the FPS-TMD systems show that the control efficiency of FPS-TMD system in wind-induced vibration obtained from the two methods is very close.It shows that the real-time hybrid test is effective in the evaluation of wind-induced vibration control efficiency of FPS-TMD system.Through the combined studies of the numerical analysis and real-time hybrid test,the wind-induced vibration control efficiency of the FPS-TMD system in tall buildings was comprehensively studied and analyzed.The effectiveness of the real-time hybrid test and numerical simulation algorithm is illustrated.Furthermore the proposed real-time hybrid test in this paper provides a powerful tool to evaluate the wind-induced vibration control efficiency of FPS-TMD system with much less cost than the traditional shake table test.