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纤维增强聚合物(FRP)可替代钢筋用于边坡加固来解决锚杆耐久性问题。FRP筋模量较小,为限制加固体的前期变形,需对其施加预应力。采用预应力施加装置完成循环加荷,光栅传感技术监测杆体应变,研究预应力施加及循环荷载下喷砂GFRP锚杆的黏结性能。研究表明,施加预应力使锚杆结构承受的过载会导致锚杆体界面黏结力损伤,同级荷载多次循环产生的损伤效应相对于过载的影响可以忽略不计;喷砂GFRP锚杆的黏结力损伤仅受过载的影响,与当前运行荷载无关;喷砂GFRP锚杆体上不同位置的界面剪力,在剪力较小时由黏结力承担,剪力较大时黏结力完全丧失转由摩阻力承担;喷砂GFRP锚杆加固结构承受峰值荷载过大后会导致黏结损伤造成锚固结构松动;预应力喷砂GFRP锚杆结构的超张荷载需超过运行荷载一定量值,以保障运行期锚固力稳定。
Fiber Reinforced Polymer (FRP) Replaces Reinforcing Bars Used for Slope Reinforcement to Solve Anchor Durability Problems. FRP tendons modulus is small, in order to limit the pre-deformation of the reinforcement, it is necessary to prestress it. The pre-stressing device was used to complete the cyclic loading. The grating sensing technology was used to monitor the rod strain. The prestressing force and GFRP bolt bond performance under cyclic loading were studied. The results show that the prestressing force causes the overload of the anchor structure to cause the damage of the bond strength of the anchor body interface. The damage effect caused by multiple cycles of the same level load is negligible compared with the overload. The adhesion of sandblasted GFRP anchor The damage is only affected by the overload, and has nothing to do with the current operating load. The interfacial shear force at different positions on the GFRP bolt sandblasted by the sandblasting is assumed by the cohesive force when the shear force is small. When the shear force is large, Bear; sandblasting GFRP anchor reinforcement structure to withstand peak load is too large will lead to bond damage caused by loosening of the anchor structure; prestressed sandblast GFRP anchor structure overload load must exceed a certain amount of value in order to protect the operation of anchoring force stable.