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Finite Element Analysis of the Tensile Properties of Novel Bonded Anchorages for CFRP Bars
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摘要: 为减小黏结式内锥形锚具在碳纤维增强复合材料（CFRP）筋受力时黏结介质的滑移，提出一种新型黏结式锚具，通过设置内阶梯增大黏结介质与钢锚筒的接触面积和摩擦力，进而减小黏结介质滑移。为验证新型黏结式内阶梯形锚具的有效性，使用有限元软件ABAQUS，分别建立单筋式内锥形锚具和内阶梯形锚具的有限元模型，进行轴向拉伸性能对比研究。结果表明：相比内锥形锚具，内阶梯形锚具的极限荷载提高了10.5%，且加载端处黏结介质滑移减小了16.4%，表明所提出的新型CFRP筋黏结式锚具有更好的受力性能。在此基础上进行内阶梯形锚具的参数分析，结果表明：直筒段长度对锚具锚固性能影响最大，锚固长度次之，阶梯高度和锚杯倾角对内阶梯形锚具锚固性能影响较小；最后给出CFRP筋直径为5 mm的单筋式内阶梯形锚具主要影响参数的建议取值范围：锚固长度取180~220 mm，直筒段长度取20~40 mm，阶梯高度取4~6 mm，锚杯倾角取2°~3°。Abstract: In order to reduce the slip of the bonding medium of the bonded inner conical anchorage when the CFRP bar is stressed，a novel bonded anchorage is proposed，which increases the contact area and friction between the bonding medium and the steel anchor cylinder through the setting of an inner step，and then reduces the slip of the bonding medium. In order to verify the effectiveness of the novel bonded inner stepped anchorage，the finite element models of single-bar inner conical anchorage and inner stepped anchorage were established using finite element software ABAQUS，and a comparative study on axial tensile performance was carried out. The analysis results showed that compared with the inner conical anchorage，the ultimate load of the inner stepped anchorage had increased by 10. 5%，and the bond medium slippage at the loading end had decreased by 16. 4%，indicating that the proposed novel CFRP ribbed bonding anchorage had better mechanical properties. On the basis of this analysis of anchorage parameters，the results showed that the length of the straight section of the anchorage had the greatest influence on the anchorage performance，followed by the anchorage length；the step height and the inclination angle of the anchor cup had a smaller influence on the anchorage performance of the inner stepped anchorage. Finally，the suggested ranges of the influence parameters for single-bar stepped anchorage with a CFRP bar diameter of 5 mm are given as follows：the anchoring length is 180 to 220 mm，the straight section length is 20 to 40 mm，the step height is 4 to 6 mm，and the anchor cup inclination angle is 2° to 3°.
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