The Along-wind Wind-induced Vibration Analysis Of The High-rise Building Structure Based On The Measured Wind Pressure Spectrum

With modern material technology and construction technology developoment, Civil engineering structures develops towards the high,light, supple direction, the sensitivity of the wind on the structure is growing, wind loads have become the most important factors which affect structural safety, comfort and economic. The accuracy of calculating the super-tall buildings wind induced vibration reponse in existing norms is debatable, urgently need more accurate methods to calculate the structure of wind-induced vibration response, in the calculation of wind induced dynamic response in along wind, between the building surface pressure fluctuation spectra and downwind flow velocity spectrum exist the quasi-steady assumption. This article is based on the measurement of wind speed and wind pressure spectrum spectrum, verifying the quasi-steady assumption frequently used between the surface wind fluctuating wind pressure and fluctuating wind velocity, and deduced the expression of wind-induced vibration response in along wind.The following work was done in this paper:(1) This experiment is conducted in a four floors Building, Considering the impact of the roof spoiler, in the north of the Building respectively arrange 5 pressure sensors at the relatively high degree of 0.85,0.8,0.67. Be sure to make the measures of airtight, waterproof and durability when pressure sensor is installed. Using the having been installed anemometer, wind speed and wind pressure measurements test are carried out.For the obtained wind speed and pressure data, the fluctuating wind velocity spectra and fluctuation pressure spectrum were obtained after data processing. Comparing the measured spectra and the measured wind pressure spectrum, Davenport spectrum, Kaimal spectrum, Von karman spectrum, finding that the measured pressure in the low frequency spectrum is slightly less than the measured wind speed spectrum, the shape is very close, is basically consistent with the quasi-steady assumption. In the high frequency Measured pressure spectrum is larger than the measured wind speed spectrum, not satisfying the quasi-steady assumption. As the measured pressure spectrum shape in the low frequency is very close to the Von karman, so based on Von karman spectrum spectrum proceed Pressure pattern fitting.(2) According to the wind pressure spectrum expression deriving wind-induced vibration in along wind, comparing to the expression derived by the the Davenport spectrum, finding value of the expression derived by the Davenport spectrum is smaller. Exploring the analysis method of the high-rise building wind-induced vibration in along wind, Contrast GBJ,GLF,LRC method, finding that the background response equivalent wind load is obtained by LRC method, the resonant response equivalent wind load is obtained by the GBJ Method. Then the combination method of the background components and the resonant component is contrast to the GLF method,GBJ method.Pulse wind equivalent wind loads is obtained by the square and re-evolution (SRSS) method. corresponding contrast finding that the combination method of the background components and the resonant component is better, integrating the advantages of GBJ method and GLF method. The background equivalent wind load can be simplified based on Quasi Mean Load method, eliminating influence onthe type of response, The simplified expression is slightly larger than the exact solution.