风机基础预应力锚索拉拔试验有限元分析

Finite Element Analysis on Prestressed Anchor Cable of Wind Turbine Foundation

为分析风机基础预应力锚索锚固段的传力机制和受力特点，使用Abaqus通用有限元软件，根据某风机基础预应力锚索试验中岩石和锚索的几何参数进行建模，模拟了未施加预应力条件下不同锚同深度时锚索、砂浆和岩体的应力发展情况。为节约计算成本，提高计算效率，在Abaqus软件中采用周围对称的平面模型，对5根钢绞线埋深5m和9根钢绞线埋深10m的两种模型分别进行了计算和对比。分析结果表明，锚索自由段越长，变形能力越强；砂浆应力和传力范嗣在不同锚固深度下差别不大，而岩石应力随着锚固位置的降低明显减小；建议设计时可施加预应力控制变形，降低锚固位置，以降低锚固区岩石应力，提高安全度。

Finite element analysis software Abaqus was used in order to analyze load transfer mechanism and the mechanical characteristics of the prestressed anchor cable of wind turbine foundation. Modeling geometric parameters of rock and anchor was taken according to a wind turbine foundation prestressed anchor cable test. Stress development of mortar and rock was simulated with different anchorage depth under without applied. To save computing costs and improve computational efficiency, a plane symmetry model was established in Abaqus software. Two models of 5 cables with 5meter depth and 9 cables with 10meter depth were calculated and compared. The results show that the longer the free anchor cable, the lager the deformation; Mortar stress and force range at different anchoring depth had little difference, and rock stress significantly reduced with the decreasing of anchoring location; It is recommended that prestressing force can be applied to control the deformation, and decreasing anchor location can reduce the rock stress of anchorage zone and then raise safety degree.