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碳纤维绞线在活性粉末混凝土中锚固性能的试验研究

发布时间:2019-01-12 09:31  文章来源:笔耕文化传播
【摘要】: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。
[Abstract]:In order to develop a kind of bonded anchor for anchoring carbon fiber reinforced composite (CFRP) strands, the bonding and anchoring properties of CFRP strands in ultra-high performance reactive powder concrete (RPC) were studied by static load test. Based on the experimental results, a reasonable anchoring method of CFRP strands in RPC is proposed, and the formulas for calculating the average interfacial bonding strength of different Anchorage systems and the critical Anchorage length of CFRP strands are established. The results show that the anchoring arrangement of CFRP strands in the Anchorage section has a significant effect on the anchoring performance, and the Anchorage efficiency can be effectively improved by dispersing the strands in the Anchorage section and then carrying on the monofilament dispersed Anchorage. The twisted shape of the wire around the CFRP strand is favorable to the bonding and anchoring of RPC, but the tensile strength will be decreased. For CFRP strands with tensile strength of 2 470 MPa, the critical anchoring lengths in RPC with compressive strength of 128.8 MPa are 120 (intermediate monofilament), 114 (peripheral monofilament), 106 (dispersed anchored strands) and 231mm (bundle anchored strands); The addition of less than 2% steel fiber into RPC has no obvious effect on the bond between CFRP strand and RPC.
【作者单位】: 湖南大学土木工程学院;四川电力设计咨询有限责任公司;
【基金】:国家自然科学基金项目(51478177)
【分类号】:U446

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