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为研发适用于锚固碳纤维增强复合材料(CFRP)绞线的粘结式锚具,通过静载试验研究了CFRP绞线在超高性能活性粉末混凝土(RPC)中的粘结锚固性能,并基于试验结果提出了CFRP绞线在RPC中的合理锚固方式,建立了不同锚固体系的界面平均黏结强度和CFRP绞线临界锚固长度计算公式。结果表明:CFRP绞线在锚固段内的锚固布置方式对其锚固性能影响显著,将绞线在锚固段内打散后再进行单丝分散锚固可有效提高绞线的锚固效率;CFRP绞线中周围丝的扭曲形态有利于其与RPC的粘结锚固,但会使其抗拉强度有所降低;对于抗拉强度为2 470 MPa的CFRP绞线,其在抗压强度128.8 MPa的RPC中的临界锚固长度分别为120(中间单丝)、114(周围单丝)、106(分散锚固的绞线)、231mm(整束锚固的绞线);RPC中掺入体积不超过2%的钢纤维对CFRP绞线与RPC间粘结性能无明显影响。
In order to develop a bonded anchor suitable for anchoring carbon fiber reinforced composite (CFRP) strands, the anchoring and anchoring properties of CFRP stranded wires in ultrahigh performance reactive powder concrete (RPC) Results The reasonable anchoring method of CFRP stranded wire in RPC was put forward. The formulas for calculating the average bond strength of interface and the critical anchoring length of CFRP stranded wire were established. The results show that the anchoring arrangement of CFRP stranded wire in the anchorage section has a significant influence on the anchorage performance. The anchoring section of the stranded wire can be dispersed and anchored, which can effectively improve the anchoring efficiency of the stranded wire. In the CFRP stranded wire The twisted shape of the surrounding filaments favors the adhesion and anchorage of the RPC, but decreases the tensile strength. For CFRP stranded wires with a tensile strength of 2 470 MPa, in RPC with compressive strength of 128.8 MPa Critical anchorage lengths are 120 (middle monofilament), 114 (monofilament perimeter), 106 (strewn anchorage), 231 mm (strand anchorage); RPC incorporates steel fibers up to 2% in volume No significant effect on the bonding properties between CFRP stranded wire and RPC.