预应力锚杆锚固段长度的研究

STUDY ON BONDING LENGTH OF PRESTRESS ANCHOR BAR

通过对锚杆承载机理的分析,根据预应力锚杆在同一拉拔力作用下锚固段的切向位移越小锚杆的承载性能越好这一特性,给出了杆体切向位移的计算方法。根据工程实际,利用预应力锚杆在拉拔过程中所测试到的切向位移,对杆体的锚固段长度进行了比较系统的分析,并由此得出了在 180 kN 预应力值下锚杆的最佳锚固段长度。

Through the analysis of loading characteristics and with the consideration of loading mechanism of smaller shear displacement with better loading properties of prestressed anchor bar, the analytical method of shear displacement was discussed. By using a practical engineering case of unstable retaining wall, which is located in Tai'an city, Shandong province, the practice bonding length of prestressed anchor bar was analyzed systemically with some in-situ pull-loading displacement data. Finally, the optimum bonding length of prestressed anchor bar under the 180 kN prestressed load was achieved.