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通过分析传统内锥式碳纤维增强塑料(CFRP)索股粘结型锚具的锚固机理,提出锚固区CFRP索股内外层丝轴向拉应力分布不均匀,以及受荷端附近CFRP丝受到弯折及挤压应力过大等不利因素导致锚具锚固性能较差,据此提出改进措施是在受荷端锚筒内部预留一定长度不浇筑粘结剂或对锚具预紧。通过轴向静力拉伸试验,分别对传统及改进后锚具的锚固性能及影响因素进行研究,试验索股采用19根Ф5的CFRP丝。结果表明:预紧力对提高锚固性能作用很大;丝间距越小锚固效率系数越高;试件长于1.6m时,长度对锚固性能的影响不大;受荷端锚筒内部预留一定长度不浇筑粘结剂,能解决受荷端附近CFRP丝受到弯折的问题;改进后锚具极限承载力为857.2kN,对应的锚固效率系数提高到101.1%,比传统锚具提高了近20%。
By analyzing the anchoring mechanism of traditional internal cone carbon fiber reinforced plastic (CFRP) bond type anchors, it is proposed that the axial tensile stress distribution in the inner and outer layers of the CFRP strand in the anchorage zone is not uniform, and the CFRP filaments near the load carrying end are bent And extrusion stress is too large and other unfavorable factors lead to poor anchoring performance of anchors, thus proposed measures to improve the anchorage in the load-bearing end of the tube to reserve a certain length of non-pouring adhesive or pre-tensioned on the anchor. Through the axial static tensile test, the anchoring performance and influencing factors of the traditional and improved anchorage were studied respectively. The experimental unit used 19 Ф5 CFRP filaments. The results show that the pre-tightening force has a great effect on improving the anchoring performance. The smaller the wire spacing, the higher the anchoring efficiency coefficient. When the length of the test piece is longer than 1.6m, the length has little effect on the anchoring performance. Without pouring the adhesive, the problem of bending the CFRP wire near the load-bearing end can be solved; after the improvement, the ultimate bearing capacity of the anchor is 857.2 kN, the corresponding anchor efficiency coefficient increases to 101.1%, which is increased by nearly 20% .