确定预应力锚索锚固长度的复合幂函数模型法

The Combined-power Model Method on Determining the Bounding Length of Prestressed Anchoring Rope

通过拟合不同工程类型的锚杆的拉拔试验实测数据,提出了锚固段轴力分布的三参数复合幂函数模型及锚索锚固段轴力分布的两参数复合幂函数模型,由静力平衡条件建立了剪应力沿其锚固长度的分布规律。分析了剪应力分布的特征,提出了一种锚索有效锚固长度计算方法,给出了参数G的取值,指出平均强度法确定锚索有效锚固长度是偏于不安全的。

A three-parameter combined-power model was proposed by curve fitting of the test data recording from the pullout trots on shaft anchor used in different geotechnical engineering. The representation of the parameters was also discussed. The two-parameter combine-power function model for prestress tendon was derived. The method to determine the bounded length from the degenerate model and the suggested value of its parameter G were also proposed. It was pointed out that the bounding length calculated from the average stress method was not safe enough.