Research On The Wind Field Characteristics And Wind-included Response Characteristics Of Super High-rise Buildings Under Construction By Practical Measurement

With the development of civil engineering,the development of super high-rise building is quite rapid with a bunch of applications,higher and more complex structure.The structure form of super high-rise buildings decides its high soft characteristics of low damping which is sensitive to the wind load,so the wind field characteristics and wind-included response characteristics of super high-rise buildings is important to the structure safety evaluation.Combining a variety of means to study structural wind engineering is always used in last decades,such as theoretical analysis,wind tunnel test,numerical simulation and field measurement.Compared with the former three methods,the field measurement is the most direct means to obtain the wind effects on structures.Therefore,it is of great engineering value and theoretical significance to study the characteristics of wind field and wind-induced vibration of super high-rise buildings by means of field measurement.Structural wind engineering research status is introduced in details in this paper,wind field characteristics of 117 building is firstly analyzed by field measurement,then the technology principle GNSS-RTK and the method of data processing is put forward,finally the GNSS-RTK technology is applied to study wind vibration response of the 117 building which is under construction,the main research and results are as follows:1.The structure wind engineering research and development overview is elaborated from theoretical analysis,wind tunnel test,numerical simulation and field measurement,in addition,pointed out that the research on the wind field characteristics and wind-included response characteristics of super high-rise buildings under construction is relatively less.2.Based on the experimental data,the characteristics of the wind field around the117 Building is analyzed,then numerical simulation of wind field around 117 building is carried out by CFD wind tunnel simulation technology.Two methods were compared.3.The development of GNSS system and the GNSS-RTK technology is introduced in details,in addition,GNSS-RTK precision and stability test is designed.The results show that: the three galaxies(GPS + GLONASS + BDS)combination has characteristics of more visible satellite,small PDOP value,small coordinate error and strong stability.For subsequent data processing,EMD filter denoising method isproposed based on self-correlation function,and applied to the stability test data processing.4.Four points by using GNSS-RTK technology are arranged in 95 th storey of117 building under construction in Tianjin to study wind vibration response,and the EMD filter denoising method based on the self-correlation function is used to deal with measured data,with which the vibration curve of measuring point,horizontal wind vibration,frequency spectrum characteristics and vibration track are studied.The feasibility of GNSS-RTK technique for the analysis of wind-induced vibration response is verified.