FRCM Strengthening of Corrosion-Damaged RC Beams Subjected to Monotonic and Cyclic Loading

An experimental investigation assessed the effectiveness of carbon and polyparaphenylene benzobisoxazole (PBO) fabric-reinforced cementitious matrix (C-FRCM and PBO-FRCM) systems in rehabilitating reinforced concrete beams affected by corrosion of the tensile steel reinforcement. Thirteen reinforced concrete beam specimens were tested using a four-point bending setup under monotonic and cyclic loading. The FRCM strengthening of the corrosion-damaged specimens significantly increased the yield and ultimate capacity. The FRCM composites efficiency was demonstrated under cyclic loading; the restoration of the beams' strength is maintained over the cyclic life. The FRCM strengthening systems were capable of extending the cyclic life up to five times in comparison with nonstrengthened control beam. The rehabilitated beams maintained their stiffness during the cyclic loading, indicating that FRCM-strengthening systems efficiently resist cyclic loads.

一项实验研究评估了碳纤维和聚对苯撑苯并双噁唑（PBO）织物增强水泥基（C - FRCM和PBO - FRCM）系统在修复受受拉钢筋腐蚀影响的钢筋混凝土梁方面的有效性。使用四点弯曲装置对13个钢筋混凝土梁试件在单调和循环荷载下进行了测试。对受腐蚀损坏的试件进行FRCM加固显著提高了屈服强度和极限承载力。在循环荷载下证明了FRCM复合材料的有效性；在循环寿命期间梁的强度恢复得以保持。与未加固的对照梁相比，FRCM加固系统能够将循环寿命延长多达五倍。修复后的梁在循环荷载期间保持其刚度，表明FRCM加固系统能有效地抵抗循环荷载。