预制装配式钢-混凝土混合式风电机组塔架中的混凝土塔段常采用分段预制、各分段间环向接缝干连接的方式制作和现场拼装。该文根据混凝土塔段环向接缝的受力特征,推导竖向力和弯矩共同作用下环向接缝的抗扭承载力积分表达式,通过Python编程计算其抗扭承载力。选用两组ABAQUS精细化有限元模拟结果与已有的铝管水平接缝抗扭承载力试验结果对比,验证提出的理论积分公式和计算程序的准确性。最后,选用工程中混凝土塔段常用的典型尺寸和竖向力,采用所提出的计算方法开展15组算例,在此基础上提出抗扭承载力的6参数计算模型,并通过最小二乘法拟合确定参数取值,给出可供预制装配式混凝土混合式风电机组塔架工程应用的环向接缝抗扭承载力设计公式。
Abstract
The concrete section of one prefabricated steel-concrete wind turbine tower is usually fabricated segmentally in the factory and assembled on site by means of circumferential dry connection between segments. In this paper, according to the structural characteristics of circumferential joints between segments, the torsional load capacity of the circumferential joints between concrete segments under the interaction of vertical force and bending moment is derived as one integral expression and calculated by Python programming. The accuracy of the theoretical integral equation and the Python program is verified by comparing the results of two sets of ABAQUS refined finite element simulation with the published test results of the torsional load capacity for the circumferential joints between aluminum tubes. Finally, the torsional load capacities of 15 concrete segment cases with typical sizes and vertical forces are carried out by the proposed method. A 6-parameter model predicting the torsional load bearing capacity of the circumferential joints is proposed, and the values of these parameters are determined by least squares method. The design formula is proposed for the torsional load bearing capacity of the circumferential joints between concrete segments in prefabricated steel-concrete wind turbine towers.
关键词
风电机组 /
塔架 /
扭转 /
承载力 /
干连接 /
设计方法
Key words
wind turbines /
towers /
torsion /
bearing capacity /
dry joints /
design method
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基金
国家自然科学基金面上项目（51978528）; 中国电力建设股份有限公司科技项目（DJ-ZDXM-2021-14）
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