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针对国内已建工程的预应力闸墩拉锚系数偏大这一问题,在锚块内设置预留槽,可提高锚索的预应力效果,降低拉锚系数。预留槽的尺寸和位置是预应力闸墩锚块预留槽设计的关键参数。本文采用有限元结构分析软件ANSYS计算分析了闸墩颈部和预留槽表面的应力分布规律,探讨了预留槽尺寸和位置对闸墩颈部和预留槽表面的应力影响。结果表明:综合考虑闸墩颈部预压效果和预留槽上、下游面拉应力,预留槽长度为2.5~3.0m、预留槽与锚块上游面距离为0.5~1.5m、预留槽宽度为0.3m比较合理。本文研究为预应力闸墩锚块内预留槽尺寸和位置的选择提供了依据。
In view of the problem that the anchoring coefficient of prestressed gate piers in domestic construction projects is too large, the provision of a reserved groove in the anchor block can increase the prestressing effect of the anchor cable and reduce the anchoring coefficient. The size and location of the reserved groove are the key parameters for the design of pre-stressed gate pier anchor slots. In this paper, the finite element structural analysis software ANSYS was used to calculate and analyze the stress distribution on the surface of the pier and the reserved groove, and the influence of the size and location of the reserved groove on the surface of the pier and the reserved groove was discussed. The results show that considering the preloading effect of the pier pier neck and reserving the tensile stress on the upstream and downstream of the groove, the reserved groove length is 2.5-3.0 m, the distance between the reserved groove and the upstream face of the anchor block is 0.5-1.5 m, Slot width of 0.3m is more reasonable. This study provides the basis for the selection of the size and location of the reserved groove in the anchor block of prestressed pier.