通过设置钢材热膨胀系数并施加温度场的方式实现有限元模型中卷制缺陷和焊接缺陷的生成,对考虑缺陷的等截面弯曲筒段进行参数化分析,探究长径比、径厚比、环焊缝间距、焊接缺陷幅值、残余应力等因素对塔筒承载力的影响,结果表明卷制和焊接残余应力对承载力有不可忽略的削弱影响。通过与欧洲规范给出的工程算法进行对比发现,在缺陷幅值较大时,有限元结果可能低于工程算法算得的承载力标准值,导致工程算法偏不保守。
Abstract
The cold bending and welding imperfections in the finite element models are generated through setting the thermal expansion coefficient of steel and applying temperature field. The influence of length-radius ratio, radius-thickness ratio, spacing of circumferential welds, amplitude of welding depression and residual stresses on the bearing capacity of the tower are investigated. The numerical results show that the influence of cold bending and welding residual stresses on the load bearing capacity of the tower is non-negligible. When the welding depression is relatively large, the finite element results may be lower than the bearing capacity characteristic values calculated by the engineering algorithm given in Eurocode 3, which means that the engineering algorithm is not conservative.
关键词
风电机组 /
塔架 /
缺陷 /
屈曲 /
承载力
Key words
wind turbines /
towers /
defects /
buckling /
bearing capacity
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基金
国家自然科学基金面上项目（51978528）
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