In the calculation of wind effects on civil constructions, the pressure coefficients, which are usually obtained from specific standards or by tests of reduced models in wind tunnels, are essential, and these coefficients are commonly established from solid and undeformable models. For greenhouses covered with plastic film, due to the flexibility of this material, there are instantaneous modifications to the shape of the construction by the action of the wind. The aim of this study was to investigate the distribution of pressure coefficients on arched roof greenhouses displaced by the wind action transverse to the ridge. To achieve this goal, computational fluid dynamics (CFD) models were used to obtain the pressure coefficients in greenhouses with ratios between height and span of 0.3 and 0.6. The change in the shape of the greenhouse due to the displacements imposed by the wind showed that there were no relevant variations in the pressure coefficients of the wall zones. However, the effects of shape displacement were very significant along the extension of the arch of the roof, with a large reduction in the pressure coefficients mainly in the vicinity of the ridge.

中文翻译：

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计算模型应用于预测变形单拱形温室压力系数

在计算土木建筑的风影响时，压力系数是必不可少的，压力系数通常由特定标准或通过风洞中的简化模型测试获得，这些系数通常是从实体和不可变形模型中建立的。对于覆盖有塑料薄膜的温室，由于这种材料的柔韧性，在风的作用下会瞬间改变建筑的形状。这项研究的目的是调查拱形屋顶温室的压力系数分布，这些温室因横向于山脊的风作用而发生位移。为了实现这一目标，计算流体动力学 (CFD) 模型用于获得温室中高度和跨度之比为 0.3 和 0.6 的压力系数。由于风造成的位移导致温室形状的变化表明墙体区域的压力系数没有相关变化。然而，形状位移的影响沿屋顶拱的延伸非常显着，主要在屋脊附近的压力系数大幅降低。