为探究干式连接装配式风电混塔在复杂耦合载荷作用下的非线性行为特征,利用ANSYS和ABAQUS两种软件分别建立涵盖风电机组基础、混凝土塔筒、钢混过渡段、钢绞线、钢塔筒、风电机组的一体化有限元模型,采用风电机组厂家提供的截面载荷进行静力加载分析,验证两种有限元模型计算结果的正确性。在此基础上,分别针对塔架结构的边界非线性、材料非线性、几何非线性行为特征开展系统研究,分析拼缝接触状态、混凝土塑性损伤模型、几何大变形对于塔架承载能力以及变形能力的影响。研究表明：干式连接混塔在极限大弯矩作用下,塔架迎风侧水平接缝会出现脱开等现象,从而让竖向接缝有空间进行切向滑动,导致上下管片相互挤压,管片出现大范围的应力集中现象,开启几何大变形后挤压现象更为明显;当管片应力超过混凝土抗拉强度后,混凝土发生开裂,钢筋发挥作用,协同受力,混凝土进行应力重分布,保障了塔架在极限荷载作用下的整体承载力和稳定性。
Abstract
In order to explore the nonlinear behavior characteristics of dry-connected prefabricated wind turbine hybrid towers under complex coupled loads, this paper uses ANSYS and ABAQUS software to establish integrated finite element models, covering wind turbine foundation, concrete tower, steel adapter, steel tower, and wind turbine. Static loading analysis is conducted using cross-sectional loads provided by the wind turbine manufacturer to verify the correctness of the calculation results of two finite element models. On this basis, systematic research was conducted on the boundary nonlinearity, material nonlinearity, and geometric nonlinearity behavior characteristics of tower structures. The effects of joint connection status, concrete elastic-plastic damage model, and geometric large deformation on the bearing capacity and deformation capacity of the tower were analyzed. Research results show that： under the action of extreme large bending moments, the horizontal joint on the windward side of the tower may detach, allowing space for tangential sliding of the vertical joints, resulting in squeeze each other of the upper and lower concrete segments, and a large range of stress concentration in the concrete segments. The squeeze phenomenon is more obvious after opening the geometric deformation; When the principal tensile stress of concrete segment exceeds the tensile strength, the concrete will crack, and the steel reinforcements work together to bear the force, the concrete undergoes stress redistribution, that ensuring the overall bearing capacity and stability of the tower under ultimate load.
关键词
陆上风电 /
装配式 /
混塔 /
连接拼缝 /
非线性行为
Key words
onshore wind power /
prefabricated /
hybrid tower /
connecting joint /
nonlinear behavior
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基金
中国博士后科学基金（2023M733316）
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