(1. School of Civil Engineering，Qingdao University of Technology，Qingdao，Shandong 266520，China；2. School of Civil and Hydraulic Engineering，Ningxia University，Yinchuan，Ningxia 750021，China)
Abstract：Basalt Fiber Reinforced Polymer(BFRP) anchor rods are favored for their high tensile strength and excellent corrosion resistance，making them a viable alternative to traditional steel reinforcement rods for addressing durability concerns of anti-floating anchor rods in corrosive environments. This study aimed to investigate the load-bearing performance of fully threaded BFRP anchor rods with different anchorage lengths and diameters using cyclic loading. The results show that，the anchor rod body and anchoring system display hysteresis in the stress-strain curves under cyclic loading. The anchor rod displacement exhibits high resilience upon unloading，indicating the elastic behavior of BFRP anti-floating anchor rods. The anchor rod body undergoes damage due to cyclic loading，with the strain of the rod body increasing with the number of cycles for the same anchorage depth. In anchor rods with varying anchorage depths，the strain of the anchor rod body and the plastic deformation generated after each load-unload cycle progressively increase with the number of cycles，and the strain of the anchor rod body is transferred to the deeper part of the anchor body. The axial force of BFRP anti-floating anchors' rods decreases from the top to the bottom of the borehole，and the range of the rods' axial force is in the range of 2.5 m down from the mouth of the borehole. Increasing the number of cycles results in higher axial force and deeper transmission depth of the anchor rod. However，the axial force decrease value of the anchor rod body in the range of 0.5～1.0 m from the hole opening decreases gradually with the increase of the number of cycles. The variation in axial stress of the anchor rod body is significantly influenced by cyclic loading，with peak values observed under different numbers of cycles. The shear stress of the BFRP anti-floating anchor rod rapidly increases with the increase in anchorage depth，reaching a peak value at a depth of 0.75 meters below the hole opening and gradually decreasing thereafter. The peak shear stress shows a decreasing trend with an increase in the number of cycles.
