论文部分内容阅读
针对预应力锚索内锚段模拟存在的困难,提出用复合单元模型来研究内锚段,为解决这一问题提供了一种新思路。该模型最突出的优点是既可以反映钢绞线、砂浆和接触面等细部结构,又可以简化网格。为检验其正确性,进行了有限元精细化模拟,将钢绞线、砂浆、接触面等细部结构精细离散。结果显示,内锚段轴向位移和应力沿钢绞线方向由外到里呈指数衰减,一般内锚段不是越长越好,3～5 m左右较为合适,这与现场监测规律相吻合。算例验证了这种方法是合理和有效的。
In view of the difficulties in the simulation of prestressed anchorage segments, a composite element model is proposed to study the inner anchorage segments, which provides a new idea for solving this problem. The most prominent advantage of this model is that it can reflect the detail structure such as strand, mortar and contact surface, and simplify the grid. In order to test its correctness, finite element simulation was carried out to finely disperse the detail structures such as strand, mortar and contact surface. The results show that the axial displacement and stress of the inner anchor segment decrease exponentially from the outside to the inside of the strand direction. Generally, the longer the anchor segment is, the better is 3 to 5 m, which is consistent with the on-site monitoring law. The example shows that this method is reasonable and effective.