The Research About The Surface Wind Pressure Characteristics And Wind Induced Responses Of The Super-high-rise Building With Two Kinds Of Typical Cross Section

With the rapid economic development and urbanization in China, the construction ofhigh-rise buildings develops at a fast speed. Under the guide of Central China’semerging strategies, a lot of high-rise buildings, which are over300m or400m, haveappeared in Changsha and other central cities. This paper was based on a research ofan actual high-rise building. The building is a typical super high-rise building with aheight of349.2m. It has large flexibility and low frequency. Large wind-inducedresponse is easy to occur under the action of wind load. During the wind tunnel tests ofthis high-rise building project, researchers found that this structure had obviousaero-elastic effects. This paper chose the building’s square section in the upper partand cross section in the lower part to make models; and then expanded the squaresection’s size to coincide with the cross section’s dimension. Four typical models weretaken into account: square section rigid model, cross section rigid model, squaresection aero-elastic model, and cross section aero-elastic model. Wind tunnel testswere carried out in the Class C flow field conditions using a variety of wind speeds andwind angles. We separately conducted synchronous pressure tests on high-rise buildingrigid models and aero-elastic model tests. Through a large number of experimental dataprocessing, in-depth analysis was made on the surface pressure distribution andwind-induced response characteristics of the high-rise buildings. The main contents ofthis paper were as follows:(1) Based on the four wind tunnel tests in this paper, we introduced the test models,pressure and vibration measurement instrumentation, and basic situation of the windtunnel laboratory. We described the conditions and arrangements of the rigid modelsimultaneous pressure measurement and the aero-elastic model test, with a focus on theproduction principle and manufacturing process of the aero-elastic model.(2) Based on the pressure test results of the square section and cross section rigidmodels, analysis was made on the surface pressure distribution characteristics of thehigh-rise buildings with two section forms.(3) Based on the pressure test results of the square section and cross section rigidmodels, we made analysis on the vertical and horizontal correlation characteristics ofthe high-rise buildings surface wind pressure. (4)According to the aero-elastic model tests, we analyzed the acceleration responseof each layer and the displacement response of the top layer. At the same time, we usedthe fluctuating pressure of the rigid model test as aerodynamic. Combined withdynamic characteristics of aero-elastic model, we wrote our own calculation programto obtain the along wind and across wind response. The calculated response wascompared with the response in the test; the cause of the different results was analyzed.Also, comparison between the two kinds of methods was made in order to geteconomic and practical research method for the high-rise buildings response.(5) The research work was summarized in this paper.