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球型结构是一种风敏感形结构形式。工程上所遇到的球型结构的直径并不相同,所处的位置也多种多样,使得直接预测球型结构的风荷载变得较为困难。本文基于RNG k-ε湍流模型,考虑了球型结构直径和球体离地面高度的不同,对众多球型结构的风荷载展开了大量而系统的研究,总结出风荷载体型系数和平均风压系数的变化规律,并对规范中旋转壳顶风荷载体型系数计算公式的可靠性进行了评价。计算结果显示,分块平均风压系数的极大负值都出现在球型结构顶部的背风区域,而且该值随球型结构顶点离地面位置的不同变化规律十分明显,本文根据众多计算结果拟合了二者的计算公式,并初步验证了该公式的可靠性。该公式对直接预测各种实际球型结构顶部区域的极大负压具有重要的参考价值。
Ball structure is a kind of wind-sensitive structure. The diameter of the spherical structure encountered in engineering is not the same, and the location is also varied, making it more difficult to directly predict the wind load of the spherical structure. Based on the RNG k-ε turbulence model, considering the difference of the diameter of the spherical structure and the height of the sphere from the ground, a large number of systematic studies have been carried out on the wind loads of many spherical structures. The wind load coefficient and the average wind pressure coefficient The reliability of the calculation formula of the body coefficient of the top wind load of the rotating shell was evaluated. The calculated results show that the maximum negative value of the block average wind pressure coefficient appears in the leeward region at the top of the spherical structure, and the value varies greatly with the change of the apex of the spherical structure from the ground. Based on many calculation results Combining the two formulas, the reliability of the formula is verified. The formula has important reference value for directly predicting the maximum negative pressure in the top region of various actual spherical structures.