This paper shows a theoretical model for reinforced concrete beams subjected to torsion and strengthened with composite of carbon fibers (CFRP). It is based on researches of Michael Collins and collaborators and approaches the theory of diagonal compressive field. This model was inserted in a mathematic software, due to the need of interactions to obtain the torsion and torsion angles. The validation of theoretical values was realized through the results of tests obtained from the literature and it was understood that the model is valid and conservative for the ultimate torsion in most of the studies carried out. However, the beams that had the geometric ratios width and height b/h < 0.5 and the ratio between the cover and the smaller dimension of the d/cob element ≤6 had not so accurate results.

本文给出了碳纤维复合材料（CFRP）加固钢筋混凝土梁的理论模型。它基于迈克尔·柯林斯（Michael Collins）和合作者的研究，并探讨了对角压缩场理论。由于需要交互以获取扭转和扭转角度，因此将该模型插入到数学软件中。理论值的验证是通过从文献中获得的测试结果来实现的，并且可以理解，该模型在大多数研究中对于最终扭转是有效且保守的。但是，宽度和高度b / h <0.5的几何比率以及d / cob元素的较小尺寸与覆盖物之间的比率≤6的光束并没有那么精确的结果。