Sun Yamin, Mei Kuihua, Sun Shengjiang, Wang Tao, Ren Xiang
School of Architecture & Civil Engineering, and Postdoctoral Research Station on Civil Engineering, Xi'an University of Science & Technology, Xi'an 710054, China.
School of Highway, Chang'an University, Xi'an 710064, China.
Polymers (Basel). 2022 May 17;14(10):2048. doi: 10.3390/polym14102048.
In this study, we proposed a novel composite anchorage that considers the anchoring performance and dimension simultaneously. The design concept of this composite anchorage was first introduced, followed by comparison with the traditional inner-cone bond-type anchorage and traditional composite anchorage through theoretical and experimental methods. Then, a parametric study was conducted to determine the influence of different parameters on the anchoring performance, and the optimal design parameters were recommended according to the finite element (FE) and test results. Finally, the practicability of the optimal design parameters were validated through experiments on the anchorage with multiple CFRP tendons. Results showed that the novel composite anchorage could improve the anchoring performance compared with the traditional inner-cone bond-type anchorage by promoting increased anchorage efficiency by 60.4% and, with an ideal failure mode of tendon rupture. Moreover, the novel composite anchorage had smaller dimensions and avoided the presence of a vulnerable position at the junction of the mechanical and bond parts compared with the traditional composite anchorage. In addition, a group of optimal design parameters of this composite anchorage with a pre-tightening force of 130 kN, an inclinational differential angle of 0.1°, an inclination angle of 2.9°, and an embedded length of 30 ~40 were proposed. The composite anchorage with five CFRP tendons designed with the proposed parameters failed with the rupture of the tendons and exhibited an anchoring efficiency of 1.05. This result showed that the optimal parameters were suitable for this novel composite anchorage to grip multiple tendons. This study can provide an experimental and theoretical basis for designing large-tonnage anchorage for multiple FRP tendons used as hangers or cables in real bridges.
在本研究中，我们提出了一种同时考虑锚固性能和尺寸的新型复合锚固装置。首先介绍了这种复合锚固装置的设计理念，然后通过理论和实验方法将其与传统内锥粘结式锚固装置和传统复合锚固装置进行了比较。接着进行了参数研究，以确定不同参数对锚固性能的影响，并根据有限元（FE）和试验结果推荐了最佳设计参数。最后，通过对多根CFRP筋锚固装置的试验验证了最佳设计参数的实用性。结果表明，与传统内锥粘结式锚固装置相比，新型复合锚固装置可提高锚固效率60.4%，改善锚固性能，且具有理想的筋材拉断破坏模式。此外，与传统复合锚固装置相比，新型复合锚固装置尺寸更小，避免了机械部件和粘结部件连接处出现薄弱部位。此外，还提出了一组预紧力为130kN、倾斜角差为0.1°、倾斜角为2.9°、埋入长度为30~40的该复合锚固装置的最佳设计参数。按照所提参数设计的五根CFRP筋复合锚固装置以筋材拉断方式破坏，锚固效率为1.05。这一结果表明，最佳参数适用于这种新型复合锚固装置锚固多根筋材。本研究可为实际桥梁中用作吊杆或拉索的多根FRP筋大吨位锚固装置的设计提供试验和理论依据。
