Detailed Zoning Anti-Floating Using PSB-Based High Strength Anchors and Their Mechanical Behaviors
With the increasing depth of building basement,rising groundwater level,and the influence of extreme weather conditions,higher requirements have been put forward for the performance of anti-floating anchors,and the limitations of traditional anti-floating anchors have become increasingly apparent.In order to address the anti-floating problem of the building with differences in structural self-weight and basement depth,we conducted detailed zoning anti-floating in different areas with high strength anchors using prestressing screw-thread steel bars instead of ordinary steel bars.The pullout capacity of a single high strength anchor can reach at 560 kN and the maximum displacement of the anchor head under a maximum test load of 840 kN is only 5.25～9.97 mm,with an average value of 7.91 mm.After unloading,the rebound rate is 18.09%～46.26%,and no damage occurred,demonstrating excellent performance.The underreamed high strength anti-floating anchor has three types of stress-strain patterns,of which(compression)-prestressing compensation-enlarged head end compression is the ideal stress-strain pattern for anti-floating anchors.It can still maintain normal convergence under a load of 1120 kN.When the pullout capacity is 560 kN,it is only in the prestressing compensation stage,which still has a great bearing potential.
万方数据
维普
