基于CFD技術(shù)建筑結(jié)構(gòu)風(fēng)荷載數(shù)值模擬研究
[Abstract]:Wind load is an important design load of structures, especially for high-rise structures (such as chimneys, towers, masts, etc.), high-rise buildings, long-span bridges, cooling towers, roofs, etc., sometimes even plays a decisive role, so wind-resistant design is an important topic in engineering structure design. For some complex structures whose body size coefficient and surface wind pressure distribution can not be determined by the load Code of Building structure and the wind tunnel test can not be carried out due to the limitation of conditions, it is of great engineering and practical significance to determine the shape coefficient and surface wind pressure of these complex building structures by numerical simulation. In this paper, based on the CFX software calculation platform, the numerical simulation of the average wind load of the building structure is carried out, which mainly includes the following aspects: (1) some influence parameters of the numerical simulation are studied by selecting the CAARC (Commonwealth AdvisoryAeronautical Research Council) standard high-rise building model with simple geometric shape, which is widely used in the world. The numerical simulation results are compared with those of TJ-2 wind tunnel test in Tongji University. The influencing factors of numerical simulation are Reynolds number, turbulence model, grid thickness, grid type and wind direction angle. Finally, the shape coefficient of CAARC standard high-rise building model is simply calculated and analyzed. Through this series of simulation analysis, it is verified that the numerical simulation method can be applied to practical engineering. (2) the wind load of a high-rise double-tower building is simulated and compared with the results of wind tunnel test. It is verified that the numerical simulation method is suitable for practical engineering. In addition to the analysis of the average wind pressure coefficient and the wind load carrier type coefficient, the flow field of the actual structure is also analyzed. Finally, the surface wind pressure interference effect of the 2 # tower of the high-rise double tower is also analyzed. (3) the average wind pressure coefficient of a bidirectional curved roof is simulated by numerical simulation method. The SST turbulence model is used to calculate the wind pressure distribution at the angles of WINDX, WINDX-,WINDY and WINDY-, and the results are compared with the simplified values given in the code. From the distribution of average wind pressure, it is found that the overhanging part of the roof is a sensitive part of the wind load, so this part should pay special attention to the structural design.
【學(xué)位授予單位】:華南理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2013
【分類號(hào)】:TU312.1
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