为研究TRC复合嵌入式预应力CFRP筋加固钢筋混凝土梁的受弯性能，对1根普通钢筋混凝土梁和5根TRC复合嵌入式预应力CFRP筋加固梁进行了四点弯曲加载，分析了开槽尺寸和CFRP筋直径对复合加固梁承载力、破坏形态和裂缝分布等受弯性能的影响。试验结果表明：复合加固梁各阶段荷载均较未加固梁提升明显。加固梁极限荷载随开槽尺寸增加提升较小，随CFRP筋直径增加提升较大；复合加固梁抗弯刚度明显高于未加固梁；开槽尺寸和CFRP筋直径的增加与梁刚度的增加不成正比；复合加固梁裂缝呈现细而密的分布特点，裂缝数量明显多于普通钢筋混凝土梁并随开槽尺寸增加有所增多，但受CFRP筋直径影响较小；未加固梁的延性明显高于加固梁，随着CFRP筋直径的增大，复合加固梁延性下降，开槽尺寸的增大对梁延性的提升效果不明显；基于文献中提出的单一加固钢筋混凝土梁的开裂荷载计算模型，提出了复合加固梁的开裂荷载计算公式，计算值与试验值误差在6.5%以内，该开裂荷载计算公式的适用性较好。

In order to study the flexural performance of reinforced concrete beams reinforced by TRC composite embedded prestressed CFRP bars, a four-point flexural load was carried out on 1 ordinary reinforced concrete beam and 5 TRC composite embedded prestressed CFRP bars, and the effects of slot size and diameter of CFRP bars on the flexural performance of the composite reinforced beams were analyzed. The test results show that the load increase of the composite reinforced beam is more obvious in each stage than that of the unreinforced beam. The ultimate load of the reinforced beam increases slightly with the increase of slot size and greatly with the increase of CFRP bar diameter. The flexural stiffness of the composite reinforced beam is obviously higher than that of the unreinforced beam. The increase of slot size and diameter of CFRP bars is not proportional to the increase of beam stiffness. The number of cracks in composite reinforced beams is obviously more than that of ordinary reinforced concrete beams and increases with the increase of slot size, but the diameter of CFRP bars has little effect. The ductility of the unreinforced beam is obviously higher than that of the reinforced beam. The ductility of the composite reinforced beam decreases with the increase of the diameter of the CFRP bar, and the increase of the slot size has no obvious effect on the ductility of the beam. Based on the calculation model of the cracking load of a single reinforced concrete beam proposed in the literature, a formula for calculating the cracking load of a composite reinforced concrete beam is proposed. The error between the calculated value and the test value is less than 6.5%, which indicates that the formula has good applicability.

广西重点研发计划项目(AB17292062)