CFRP ropes are relatively new and cheap materials that can be used in strengthening and rehabilitating RC elements. This research was designed to investigate the experimental behaviour of heat-damaged and unheated RC beams strengthened and retrofitted using near-surface mounted (NSM) carbon fiber polymer (CFRP) ropes. Ten RC beams were tested under a four-point loading test. Five beams were subjected to 700°C for 3 h and were partially damaged by heat while the other remaining beams were unheated. Several strengthening configurations were adopted where CFRP ropes were continuously anchored along the beam length. The flexural strength of the test specimens was then predicted using the ACI-440 guidelines and compared to the experimental results. Test results showed that the continuous strengthening configuration is considerably efficient in increasing the flexural strength of the RC beams. Adopting two layers of continuous CFRP ropes along the beam length, anchored at the tensile reinforcement level, increased the load capacity and stiffness of the unheated beams by 60% and 78%, respectively. It also restored the load capacity of the heat-damaged beams with an additional 47% in its’ load carrying capacity, but it decreased their peak deflection. Test results showed that the current ACI-440 guidelines that are designed for predicting the flexural strength of RC beams strengthened with NSM bars could be applied to predict the flexural strength of RC beams strengthened with NSM CFRP ropes with a suggested modification factor for the effective strain.

CFRP绳索是相对较新的廉价材料，可用于加固和修复RC元件。本研究旨在研究使用近表面安装（NSM）碳纤维聚合物（CFRP）绳索加固和翻新的受热损坏和未受热的RC梁的实验性能。在四点载荷测试下测试了十个RC梁。五个光束在700°C的温度下放置3小时，并由于加热而部分损坏，而其余的其余光束则未加热。采用了几种加固配置，其中CFRP绳索沿梁的长度连续锚固。然后，使用ACI-440准则预测了试样的抗弯强度，并将其与实验结果进行了比较。测试结果表明，连续加固配置在提高RC梁的抗弯强度方面非常有效。沿梁长度采用两层连续CFRP绳索锚固在抗拉加固层上，可将未加热梁的承载能力和刚度分别提高60％和78％。它还将热损伤梁的载荷容量恢复了47％，但降低了其峰值挠度。测试结果表明，当前用于预测用NSM钢筋加固的RC梁抗弯强度的ACI-440指南可用于预测用NSM CFRP绳索加固的RC梁的抗弯强度，并建议了有效应变的修正系数。沿梁长度采用两层连续CFRP绳索锚固在抗拉加固层上，可将未加热梁的承载能力和刚度分别提高60％和78％。它还将热损伤梁的载荷容量恢复了47％，但降低了其峰值挠度。测试结果表明，当前用于预测用NSM钢筋加固的RC梁抗弯强度的ACI-440指南可用于预测用NSM CFRP绳索加固的RC梁的抗弯强度，并建议了有效应变的修正系数。沿梁长度采用两层连续CFRP绳索锚固在抗拉钢筋水平上，可将未加热梁的承载能力和刚度分别提高60％和78％。它还将热损伤梁的载荷容量恢复了47％，但降低了其峰值挠度。测试结果表明，设计用于预测用NSM钢筋加固的RC梁的抗弯强度的现行ACI-440指南可用于预测用NSM CFRP绳索加固的RC梁的抗弯强度，并建议了有效应变的修正系数。将未加热梁的承载能力和刚度分别提高了60％和78％。它还将热损伤梁的载荷容量恢复了47％，但降低了其峰值挠度。测试结果表明，设计用于预测用NSM钢筋加固的RC梁的抗弯强度的现行ACI-440指南可用于预测用NSM CFRP绳索加固的RC梁的抗弯强度，并建议了有效应变的修正系数。将未加热梁的承载能力和刚度分别提高了60％和78％。它还将热损伤梁的载荷容量恢复了47％，但降低了其峰值挠度。测试结果表明，设计用于预测用NSM钢筋加固的RC梁的抗弯强度的现行ACI-440指南可用于预测用NSM CFRP绳索加固的RC梁的抗弯强度，并建议了有效应变的修正系数。