Study On Reliability-based Eveluation Criteria Of The Occupants Response Of Wind-induced Vibration In Tall Buildings

Since the reform and opening policy,China's urbanization process has been gradually deepened,and the numbers and heights of high-rise buildings have been increasing.However,the increasing of buildings' height has not brought about the improvement of wind-induced vibration and comfort design standards for high-rise buildings.In the comfort design,unpractical vibration data resulted in high-rise buildings' comfort level lack of rationality and applicability for a long time.In this paper,we choose some classic classification of comfort norms in the world and analysis them from the standard development,limit control and other aspects of comparative analysis.Also combined with specific high-rise building cases from the numerical simulation and the dynamic reliability simulation to carry on various aspects of calculation.Thus we could get more practical experience summary and design ideas.In view of the limitation of the current comfort evaluation standard in our country,the improved comfort evaluation standard has been put forward.This paper analyzes the research background,the design method and basis of the comfort standard of China,Japan and IS06897.According to the theory of correlation analysis,the improved measures are adopted,including the use of wind-induced vibration mean square root acceleration limit of 6 Gal,the peak factor is 4.0?5.0,the wind load return period is 1 Year and the corresponding recurrence of the residents are not satisfied with the control below 2%.Based on the measured vibration characteristics in the field,a finite element building model of ANSYS WORKBENCH in Shenzhen is established.The CFX flow field software is used to simulate the fluid-so lid coupling of the super high-rise building.The numerical simulation results,the wind tunnel experimental results are compared with the measured results,and the structural acceleration response curve with the wind speed is fitted.Combined with the wind tunnel experimental data,measured data and numerical simulation data based on the current evaluation criteria and improve the evaluation criteria for comfort evaluation.The results show that the actual wind vibration comfort meets the standard requirements,and the improvement comfort evaluation standard is more effective and reasonable than the current comfort evaluation standard.Based on the current comfort evaluation criteria and improved comfort evaluation criteria,the reliability analysis of the tall structure's wind-induced vibration comfort is analyzed.We use the Monte Carlo method to obtain the failure probability of the comfort limit in the frequency domain of the high-rise structure by obtaining the function of the acceleration response function of the high-rise structure in the along wind direction and the transverse wind direction.Then,the Kaimal spectrum is obtained by using the Kaimal function.The dynamic response spectrum of the upper layer is obtained by MATLAB,and the dynamic response curve of the structure is obtained according to the basic idea of the response surface method.According to the Monte Carlo sampling method,the model is obtained by the horizontal aerodynamic spectrum.Compare the time domain reliability and frequency domain reliability.The results show that the reliability index of high-level structure based on improved evaluation is with higher comfort reliability.Based on the current evaluation standard,the structural reliability index is below 1.0.Based on the improved evaluation standard,the time domain reliability index also proves the correctness of improving the evaluation standard in the reliability index.