预应力锚固提高锚杆的极限抗拔力

锚杆随着锚固长度的增加,极限抗拔力并不是线性增加的,而是增加得越来越不明显。为此,本文提出了预应力锚固这一概念,预应力锚固可以在锚固长度不增加的情况下增加极限抗拔力,而且对锚固长度长的锚杆更有效,并用理论和试验证明了这一结论。分析了预应力锚固和预应力锚杆的区别。提出了预应力锚固的锚杆的施工方法,分析了与其相应的握裹力分布和极限抗拔力。对比了预应力锚固的锚杆与非预应力锚固的锚杆的不同。

Prestrssed Anchorage Increases the Ultimate Pull-out Resistance of the Anchor Rod

With the increase of the anchorage length of the anchor rod,the ultimate pull- out resistance of the anchor rod does not increase linearly,but is less and less obvious by gradual increase.For this reason,the idea of the prestressed anchorage is presented,which can increase the ultimate pull-out resistance of the anchor rod without increasing the anchorage length and is of great help to the anchor rod with long anchorage length.This conclusion is proved here by theory and experi- ments.The difference between prestressed anchorage and prestressed anchor rod is analysed.Prestressing method for anchor rod of prestressed anchorage is presented. The bond stress distribution and pull-out resistance for each prestressing method is discussed.Comparison between anchor rod of prestressed anchorage and anchor rod of nonprestressed anchorage is made.