| In recent years,with the development of economy and technology,more and more high-rise buildings have been erected.Although the emergence of these high-rise and even super high-rise buildings highlights the level of modern urban development and improves the utilization of land resources,the increase of structure height will inevitably bring some other problems.For example,the higher the height of the building,the more flexible the structure will become,wind load will become the main control load,and the super tall building is very sensitive to the wind load,under the action of wind load will produce a large vibration response,making the building occupants or office workers feel uncomfortable.To address the above problems,this paper adopts the hybrid control of VDTMD-VFD to reduce the vibration response of wind-induced structure based on a 250m high residential project in Prince's Bay,Shenzhen,and studies the comfort and reliability of the structure before and after vibration reduction.The details of the study are as follows.1.Organize and summarize the research background of wind vibration comfort of high-rise buildings,and comprehensively compare and analyze the evaluation standards of wind vibration comfort at home and abroad.2.The basic principles of the VDTMD system are introduced,a simplified model of the super-tall structure under tandem multi-degree of freedom is established,the vibration equations of the super-tall structure under wind load,the vibration equations under the VDTMD-super-tall structure system and the vibration equations under the coupling of VDTMD and VFD with the super-tall structure are derived based on the simplified model,and solved by MATLAB programming.3.Taking Shenzhen Prince Bay DY03-07 residential project as an example,the simplified model is established and validated,the wind load time equation is obtained according to the wind tunnel test data,and the wind induced response is calculated before and after setting the variable damping TMD and the TMD system parameter optimization analysis is carried out for the simplified model.The calculation results show that under the wind load of 10-year recurrence period,the frequency ratio between TMD and structure is 0.98,and the wind vibration acceleration damping effect of TMD is optimal when the damping ratio is 15%;under the wind load of 100-year recurrence period,when the large damping coefficient of VDTMD is 6 times of the small damping coefficient,the relative displacement between TMD and top floor of the structure is 825mm,which is less than the limit value of 1000mm.4.The wind induced vibration response is calculated for two schemes of variable damping TMD and VDTMD-VFD,and the results are analyzed.The analysis results show that under the wind load of 10-year recurrence period,the acceleration at the top floor of the structure is 0.161m/s~2when only VDTMD is arranged,which does not meet the limit value of0.15m/s~2,while the acceleration at the top floor of the structure is 0.143m/s~2when the VDTMD-VFD is arranged,which meets the limit value of 0.15m/s~2.Under the wind load of100-year recurrence period,the relative displacements of TMD and the top floor of the structure are 825mm and 806mm respectively,which meet the limit value of 1000mm.The above analysis shows that the wind vibration control scheme of VDTMD-VFD has better vibration reduction effect.Finally,the technical solution of VDTMD for this project is proposed,and the main technical indexes of TMD are calculated and the design scheme is proposed according to the calculation results of wind vibration response control.5.Based on the von Karman spectrum,the time course of wind speed in downwind and crosswind directions at the top height of the structure is fitted by the harmonic synthesis method,and the simulated spectrum is calculated and compared with the target spectrum,which shows that the simulated spectrum is in good agreement with the target spectrum;random variables are selected according to the first transcendence probability,and use ETABS2015 to analyze the time course of the structure before and after the arrangement of the TMD-VFD.The maximum acceleration in the downwind and crosswind directions of the top floor of the structure was obtained by time course analysis,and then the functional functions of the acceleration in the downwind and crosswind directions of the top floor of the structure before and after the fatigue of the TMD system were derived according to the response surface method,and the Monte Carlo method was used to calculate the comfort and reliability of the structure under the wind loads in the 10-year recurrence period under the two conditions.The calculation results show that the arrangement of TMD-VFD can significantly improve the structural wind comfort reliability under the 10-year return period,and the structural wind comfort reliability is not significantly affected when fatigue occurs in the TMD. |
PDF Full Text Request