新型液晶聚芳酯纤维编织增强碳纤维复材筋抗剪抗弯性能研究  

Research on Shear and Bending Performance of Novel LCP-Fiber-Braided Reinforced CFRP Tendons

作　　者：荚瑞馨 刘越 JIA Ruixin;LIU Yue(The College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]北京科技大学土木与资源工程学院,北京100083

出　　处：《工业建筑》2024年第12期238-245,共8页Industrial Construction

基　　金：国家重点研发计划项目(2022YFC3801800)。

摘　　要：碳纤维增强复合材料(CFRP)因其轻质、高强、耐腐蚀、抗疲劳和低蠕变等优点,具有制成预应力筋在预应力结构中替代钢筋的潜力。然而,拉挤成型CFRP筋的横向剪切和弯折性能不足,限制了其在预应力结构中的应用。液晶聚芳酯(LCP)纤维以其良好的力学性能和尺寸稳定性著称,尤其在抗剪防割性能方面表现优异,已在防护服装、体育用品和航空领域得到应用。本研究旨在通过外层编织LCP纤维来增强拉挤成型CFRP筋的剪切和弯曲性能,提升CFRP筋在预应力结构中的适用性。开展了LCP纤维编织增强不同纤维含量(55%和65%)CFRP筋的剪切试验和三点弯曲试验,探明了LCP新材料与拉挤-编织成型新工艺对CFRP筋的抗剪和抗弯性能的提升效果。结果表明:外层编织LCP纤维能显著提高拉挤成型CFRP筋的抗剪和抗弯强度及延性;与未编织相比,编织后纤维含量55%和65%的CFRP筋抗剪强度分别提高了54.6%和55.0%,剪切荷载峰值变形分别提高了10.4%和38.5%;抗弯强度分别提高了26.6%和14.9%,弯曲荷载峰值变形分别提高了13.1%和38.8%。总体而言,随着CFRP筋纤维体积含量的增加,编织带来的性能提升效果随之增强。本研究可为LCP纤维编织增强CFRP筋在预应力结构中的应用提供参考。Carbon fiber reinforced polymer composites(CFRP)are candidates for prestressing tendons due to their advantages over rebars,such as lighter weight,higher strength,and resistance to corrosion,fatigue,and creep.However,the transverse shear and bending properties of pultruded CFRP tendons are insufficient for their widespread application in prestressed structures.Liquid crystal polyarylate(LCP)fibers,known for their excellent mechanical properties and dimensional stability,particularly in shear and cut resistance,are used in various industries including protective clothing,sports equipment,and aerospace.This study aimed to enhance the shear and flexural properties of pultruded CFRP tendons by incorporating braided LCP fibers in the outer layer,thereby improving their suitability for prestressed structures.Shear and three-point bending tests were conducted on CFRP tendons with different fiber volumes(55%and 65%)reinforced with braided LCP fibers.The goal was to assess the impact of the LCP material and the pultrusion-braiding process on the shear and bending characteristics of CFRP tendons.The findings indicate that the braided LCP fibers significantly improved the shear and flexural strength and ductility of pultruded CFRP bars.The shear strengths of the braided CFRP tendons with 55%and 65%fiber content increased by 54.6%and 55.0%,respectively,and the shear peak deformations increased by 10.4%and 38.5%,respectively.Similarly,the flexural strengths increased by 26.6%and 14.9%,and the bending peak deformations increased by 13.1%and 38.8%,respectively.In general,the performance enhancement achieved through braiding with an increase in the volume content of CFRP reinforcement fibers.This research offers valuable insights for the use of LCP-fiber-braided reinforced CFRP tendons in prestressed concrete applications.

关 键 词：碳纤维增强复合材料 液晶聚芳酯纤维 拉挤-编织成型 力学性能 试验研究 

分 类 号：TU599[建筑科学—建筑技术科学]