Design and Test Study of New Dual-Curved Carbon Fiber-Reinforced Polymer Plate Anchorage
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摘要:
针对现有CFRP板锚固技术中挤压应力横向分布不均匀导致板材承拉后易撕裂破坏，难以控制螺栓预紧力的问题，本文研制了双曲面CFRP板锚具，其主要构造特征为外夹板设有横向圆弧面（可使CFRP板所受挤压应力横向分布较均匀），内夹板设有纵向圆弧面（可充分挤压锚固区中段，避免端口处剪切破坏）；通过限位片控制外夹板挤压位移，以实现所需的预紧力锚固CFRP板；对6组新型锚具试件进行锚固性能试验，探究其受力机理；利用ANSYS有限元软件进行受力模拟，深入分析影响锚固性能的关键参数，同时与平板式锚具的受力性能展开对比. 研究表明：外夹板厚度是影响CFRP板挤压应力横向分布不均匀的主要因素，当外夹板厚度为27 mm时，CFRP板挤压应力横向分布较均匀，最大与最小压应力之差仅为9.3 MPa；内、外夹板的弧面设计优化了CFRP板挤压应力分布状态，同时减小了碳纤维间的应力差，使CFRP板的横向变形更同步；试件破坏状态为撕裂破坏，但新型锚具锚固效率系数可达104.16%.
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关键词:
- 桥梁工程 /
- 双曲面CFRP板锚具 /
- 静载张拉试验 /
- 有限元模拟 /
- 锚固效率
Abstract:To address the issues of uneven transverse distribution of compressive stress in existing carbon fiber-reinforced polymer (CFRP) plate anchorage technology, which leads to tearing failure of plates under tension and the difficulty in controlling bolt preload, a dual-curved CFRP plate anchorage was developed. This device’s main construction features were outer clamping plates with transverse arc surfaces to ensure uniform transverse distribution of compressive stress sustained by the CFRP plate and inner clamping plates with longitudinal arc surfaces to fully compress the middle section of the anchorage zone and avoid shear failure at the ends. The compressive displacement of the outer clamping plates was controlled by the limit plate to anchor the CFRP plate with the required preload. The anchorage performance test for six groups of new anchorage specimens was carried out to explore their stress-bearing principle. Finite element software ANSYS was used to perform stress simulation; the key parameters affecting anchorage performance were deeply analyzed; the stress-bearing performance of CFRP plate anchorage was compared with that of flat-plate anchorage. The results indicate that the thickness of the outer clamping plates is the dominant factor influencing the non-uniform transverse distribution of compressive stress sustained by CFRP plates. When the thickness of outer clamping plates is 27 mm, the CFRP plates exhibit a higher uniform transverse distribution of compressive stress, with a compressive stress difference of only 9.3 MPa between maximum and minimum values. The curved surface design of inner and outer clamping plates effectively optimizes the compressive stress distribution state of the CFRP plate, while minimizing stress difference among carbon fibers and resulting in significantly improved synchronization of transverse deformation of CFRP plates. Although the specimens ultimately fail in a tearing state, the new anchorage achieves an exceptional anchoring efficiency coefficient of 104.16%.
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图 2 平板锚具CFRP板挤压应力横向分布
Figure 2. Transverse distribution of compressive stress sustained by flat-plate CFRP plate anchorage
图 5 新型锚具CFRP板挤压应力横向分布
Figure 5. Transverse distribution of compressive stress sustained by new CFRP plate anchorage
图 6 内夹板与CFRP板挤压变形
Figure 6. Compressive deformation of inner clamping plate and CFRP plate
图 17 外夹板纵向边缘挤压位移
Figure 17. Compressive displacement at longitudinal edge of outer clamping plate
图 20 不同锚具纵向剪应力分布
Figure 20. Longitudinal shear stress distribution of different anchorages
图 23 外夹板挤压位移的影响
Figure 23. Effects of compressive displacement of outer clamping plate
表 1 内、外夹板材料性能
Table 1. Material performance of inner and outer clamping plates
抗拉强度/MPa 屈服强度/MPa 弹性模量/GPa 泊松比 980 785 206 0.3 
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表 2 高强螺栓性能
Table 2. Performance of high-strength bolts
抗拉强度/MPa 屈服比 屈服强度/MPa 最小拧紧力矩/N*m 1200 0.9 1085 635
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表 3 CFRP板材料性能
Table 3. Material performance of CFRP plate
弹性模量/GPa 极限抗拉强度/MPa 极限承载力/kN 层间剪切强度/MPa 极限延伸率/% 160 2400 480 50 1.5
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