The strength of reinforced concrete members can be enhanced using externally bonded reinforcement (EBR) and near surface mounted (NSM) methods. However, small number of studies has adopted the NSM method for torsional strengthening. To date, no study has examined the use of spiral NSM steel wire rope and epoxy adhesives for torsional strengthening. Therefore, this study examines the behaviour of RC beams subjected to the combined actions of torsion and bending moment when they are strengthened with spiral NSM steel wire rope (Ø8 mm) in different configurations. For this purpose, six beams of 15 cm × 25 cm × 200 cm were casted. One of these beams was conventional, whereas all the other beams were strengthened with spiral NSM steel wire rope. During the testing process, the twist angle at the torque intervals, first cracking torque, ultimate torque and ultimate twist angle of the conventional beam were compared with those of the strengthened beams. The torsional performance of the RC beams was significantly improved using spiral NSM steel wire rope in various spiral NSM configurations.

中文翻译：

---

连续螺旋近表面安装钢丝绳钢筋混凝土梁的抗扭加固

钢筋混凝土构件的强度可以使用外部粘合钢筋 (EBR) 和近表面安装 (NSM) 方法来增强。然而，少数研究采用了 NSM 方法进行扭转强化。迄今为止，还没有研究检查使用螺旋 NSM 钢丝绳和环氧树脂粘合剂进行扭转加固。因此，本研究检验了 RC 梁在用不同配置的螺旋 NSM 钢丝绳（Ø8 毫米）加固时承受扭转和弯矩联合作用的行为。为此，铸造了 6 根 15 cm × 25 cm × 200 cm 的梁。其中一根梁是常规梁，而所有其他梁都用螺旋 NSM 钢丝绳加强。在测试过程中，扭矩间隔处的扭转角，第一次开裂扭矩，将常规梁的极限扭矩和极限扭转角与加强梁的极限扭矩和极限扭转角进行了比较。在各种螺旋 NSM 配置中使用螺旋 NSM 钢丝绳显着改善了 RC 梁的扭转性能。