文章摘要
BFRP网格增强ECC加固锈蚀RC梁短期刚度试验与理论研究
Experimental and theoretical investigation on short-term stiffness of corrosion-damaged RC beams strengthened with BFRP grid-reinforced ECC matrix composites
投稿时间：2024-02-03  修订日期：2024-04-08
DOI：
中文关键词: 锈蚀钢筋混凝土梁  FRP网格增强高延性水泥基材料  受弯性能  短期刚度
英文关键词: corroded RC beams  FRP grid-reinforced engineered cementitious composite  flexural properties  bending stiffness
基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）
作者单位
李杉* 武汉大学 土木建筑工程学院 
安俊澎 武汉大学 土木建筑工程学院 
卢亦焱 武汉大学 土木建筑工程学院 
郑傲寒 武汉大学 土木建筑工程学院 
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中文摘要:
      通过3根未锈蚀钢筋混凝土(RC)梁、5根锈蚀RC梁和11根BFRP网格增强高延性水泥基复合材料(FGCC)加固锈蚀RC梁受弯性能试验,研究不同配筋率、纵筋锈蚀率和FRP网格加固量等因素对FGCC加固锈蚀RC梁抗弯刚度和跨中挠度的影响。结果表明：采用FGCC加固能有效改善锈蚀RC梁的裂缝分布形态,提高锈蚀RC梁的抗弯刚度,减小锈蚀RC梁跨中挠度。对刚度的影响主要集中于混凝土开裂后阶段,尤其在纵筋屈服后,抗弯刚度提高程度较为显著,且提高幅度随着FRP网格加固量增大而增大。基于理论分析,建立了FGCC加固锈蚀RC梁的抗弯刚度计算公式,并采用正常使用阶段的跨中挠度对计算公式进行了验证,计算值与试验值吻合良好,为FGCC加固锈蚀RC梁抗弯刚度计算的提供参考。
英文摘要:
      The flexural tests were conducted on three non-corroded RC beams, five corroded RC beams and eleven corroded RC beams strengthened with a fiber-reinforced polymer grid reinforced engineered cementitious composite (FGCC). The effects of longitudinal reinforcement ratio, corrosion level and strengthening amount on the bending stiffness and mid-span deflection of strengthened beams were studied. The results showed that using FGCC strengthening technique could effectively ameliorate the cracking behavior, improving the bending stiffness, and reducing the mid-span deflection of the corroded RC beam specimen. The bending stiffness improvement of tested beams mainly appeared after concrete cracking, especially after steel reinforcements yielding, and the improvement increased with the increase of FRP grid strengthening amount. Based on the theoretical analysis, a formula of the bending stiffness for corroded RC beams strengthened with FGCC composites was established, which was verified by the mid-span deflections of strengthened beams under service state. The calculated values showed a good agreement with the experimental values, which demonstrated that this model could be used for theoretical analysis and structural design for corroded RC beams strengthened with FGCC composites.
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