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计算风工程作为风洞试验的补充技术,已得到越来越多的应用,但是使用RNS方法进行非定常计算精度低,而大涡模拟可对大尺度漩涡直接求解,可以得到较精确的模拟结果。因此对超高层建筑进行了多工况的CFD大涡模拟,研究不同风向角下建筑表面风荷载的变化规律,并与风洞试验结果进行对比,简要阐述了建筑体型对风荷载的影响。将大涡模拟得到的非定常风压时程作为结构激励,采用频域法计算高层建筑的随机振动响应,根据惯性风荷载方法,求解结构的等效静力风荷载,并与风洞试验结果进行对比。对比分析表明,大涡模拟技术可以很好地模拟建筑表面风荷载,并可以克服测点布置、不同步测试带来的系统误差;频域法分析得到的等效静力风荷载与风洞试验结果基本一致,可以将本文方法计算得到的风荷载作为设计依据。
Computational wind engineering is more and more widely used as an additional technique in wind tunnel tests. However, the accuracy of unsteady calculations using RNS is low, and large eddy simulation can directly solve large-scale vortexes and obtain more accurate simulation results . Therefore, the CFD large-eddy simulation of multi-condition for super high-rise buildings was carried out to study the variation rule of wind loads on building surface under different wind direction angles. Compared with the wind tunnel test results, the effect of building shape on wind load was briefly described. The unsteady wind pressure time history obtained from large eddy simulation is used as structure excitation, and the random vibration response of tall buildings is calculated by frequency domain method. According to the method of inertial wind load, the equivalent static wind load of the structure is solved and compared with wind tunnel test results comparing. The comparative analysis shows that LES can simulate the wind load on the building surface and overcome the system error caused by the arrangement of measuring points and the out-of-step test. The equivalent static wind load and wind tunnel test The results are basically the same, and the wind load calculated by this method can be used as design basis.