Multi-objective Equivalent Static Wind Load Of Displacement And Interstory Displacement Angle Of High-rise Building

With the progress and development of science and technology and economy,high-rise buildings and super-high-rise buildings are scattered all over the world.The building not only improves the utilization rate of the urban land,but also shows the modernization level of the city.and with the increase of the height of the building structure,the structure becomes more and more flexible,the structure damping is relatively small,the wind load excellent frequency and the structural natural frequency of the structure are more and more close,the effect of the building on the wind load is very sensitive,the pulsation wind load effect is remarkable,The research on the anti-wind of super high-rise building is of great significance.For super high-rise buildings,in addition to displacement response,inter-layer displacement angle response is also an important index to consider structural safety,comfort and economy.The existing equivalent static wind load mainly focuses on the displacement response,and in the complex super high-rise building structure,the vertical stiffness unevenness can occur,namely,the displacement response calculated by the equivalent static wind load can meet the requirements of the performance index,and the accuracy of the inter-layer displacement angle response is ignored.In order to study the effect of wind load on super tall buildings,the variation of wind pressure coefficient on the surface of CAARC(Commonwealth Advisory Aeronautical Research Council)standard model with wind direction angle and its horizontal and vertical distribution are studied based on the simultaneous pressure measurement of rigid model.And the correlation between the measured pressure points and the wind pressure distribution on the building surface is studied,which verifies the correctness of the wind tunnel test data.In order to study the merits and demerits of different wind induced vibration analysis methods,the time-domain and frequency-domain analysis methods,such as CQC method,SRSS method,HEM method and so on,are compared using the wind tunnel test time history data obtained above.The formula for calculating the angular response of interlayer displacement in frequency domain is derived,and the correctness of the derivation is verified.In view of the above problems,the equivalent effect and calculation accuracy of the traditional equivalent static wind load with displacement response as equivalent target and interstory displacement angle response asequivalent target are discussed.The results show that the equivalent static wind load with displacement as the equivalent target fails to be accurately equivalent to the interstory displacement angle response.In this paper,a multi-objective equivalent method based on displacement and interstory displacement angle response is proposed,and its equivalent effect and accuracy are verified by an example.It is hoped that the research of this paper can provide some guiding significance for the structural wind vibration response analysis based on wind tunnel test data and the equivalent static wind load calculation.