为考虑风电机组预制装配式混凝土塔筒环向分片后剪切效应的影响,推导了任意几何尺寸管片的截面翘曲剪切系数计算公式,并建立2~6分片混凝土筒节的有限元模型,对比数值分析、规范方法、考虑翘曲剪切及传统Vlasov理论的扭转角计算值,结果表明：翘曲剪切系数与分片圆心角负相关,与壁厚和半径之比正相关;分片数量少、厚径比小的筒节剪切效应更加显著。规范方法和传统Vlasov理论方法会较大程度低估构件的扭转变形,特定情况下仅为有限元结果的52%和21%;该文所提考虑翘曲剪切的方法不仅偏于安全,且整体上与数值分析结果更接近,特定情况下可比规范方法减小30％以上的偏差。
Abstract
In order to consider shear effect influence of the prefabricated concrete tower for segmented wind turbine , a formula for calculating the warping shear coefficient of one segment with arbitrary geometric dimensions is derived. The finite element models of concrete towers with 2-6 segments are established to compare the twist angles of numerical analyses, the code’s method, the warping shear formula, and the Vlasov theory, respectively. The results show that the warping shear coefficient is negatively related to the center angle of the segment and positively related to the ratio of thickness to radius. The shear effect of the tube with fewer segments or a smaller ratio of thickness to radius is more significant. The code’s method and the Vlasov theory will greatly underestimate the torsional deformation of the segment. In certain cases, it will be only 52% and 21% of the numerical results. The proposed method considering the warping shear coefficient is not only safer, but also generally consistent with the numerical results. The deviation can be reduced by more than 30% than the code’s method under specific cases.
关键词
风电机组 /
塔筒 /
剪切变形 /
薄壁结构 /
约束扭转 /
翘曲剪切系数
Key words
wind turbines /
towers /
shear deformation /
thin-wall structure /
restrained torsion /
warping shear ratio
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