Field test of anchorage performance of BFRP anti-floating anchors under multiple cyclic loads
Basalt fiber reinforced polymer(BFRP)anchors have the advantages of high tensile strength and good corrosion resistance,which can replace the traditional steel anchors to solve the durability problem of anti-floating anchors in corrosive environment.In this test,cyclic loading was used to study the load carrying performance of fully threaded BFRP anchors with different anchorage lengths and diameters.The results show that the load-displacement curves of anchor rod and anchor solid under cyclic loading present hysteresis.The anchor displacement rebound rate is high when unloading,and the elasticity of BFRP anti-floating anchors is obvious.Anchor rod is damaged by cyclic loading,and the strain of anchor rod with the same anchorage depth increases with the increase of cyclic times.For anchors with different anchorage depths,with the increase of cyclic loading times,the strain increase of the anchor rod body and the plastic deformation generated after unloading of each level of loading gradually increased,and the strain of the anchor rod body was transferred to the deeper part of the anchor body.The axial force of BFRP anti-floating anchors'rods attenuated from the mouth of the aperture from the top to the bottom,and the range of the rods'axial force was in the range of 2.5 m from the mouth of the aperture downward.The increase in the number of cyclic loadings resulted in an increase in the anchor rod axial force and a deeper transfer depth,but the attenuation value of the anchor rod axial force in the range of 0.5-1.0 m downward from the orifice gradually decreased with the increase in the number of cycles.The amount of change of axial stress of anchor rods is greatly affected by cyclic loading,and there is a peak value of change of axial stress of anchor rods under different cyclic loading.The shear stress of BFRP anti-floating anchors increases rapidly with the increase of anchorage depth,and reaches the peak value at the depth of 0.75 m below the mouth of the borehole,and then decreases gradually,and the peak value of the shear stress appears to be attenuated with the increase of the number of cycles.
万方数据
维普
