Grouted fibre-reinforced composite stand-off sleeve repair is a light-weight and easily deployable repair system for steel pipelines with localised metal loss. The effectiveness of this type of repair system is dependent on the load transfer through the grout layer, which is weaker than neighbouring components and susceptible to failure due to stresses developed from applied internal pressure. In this study, three dimensional (3D) Finite Element Analyses (FEA) of a full-scale pipe with different levels of metal loss were implemented to evaluate the failure behaviour and capacity of grouted composite repair system. Steel pipes with a localised defect ranging from 20% to 80% metal loss and repaired using two infill grout systems reinforced with carbon and glass sleeves of different thicknesses were considered. The results indicated that the performance of the repair system is governed by the tensile cracking of the infill grout. A thicker sleeve and higher tensile strength grout delivers higher pipe capacity in the repair system. On the other hand, a high modulus grout provides a more effective load transfer from steel to sleeve. Using a high tensile strength grout, the composite repair system can restore the capacity of the steel pipe with defect up to about 70% metal loss.

灌浆的纤维增强复合材料支座套筒修理是一种重量轻且易于部署的修理系统，适用于具有局部金属损失的钢管。这种类型的维修系统的有效性取决于通过灌浆层的载荷传递，该载荷要弱于邻近的组件，并且由于施加的内部压力产生的应力而容易失效。在这项研究中，对具有不同金属损失水平的全尺寸管道进行了三维（3D）有限元分析（FEA），以评估灌浆复合材料修复系统的破坏行为和能力。考虑了局部缺陷范围为金属损失为20％至80％的钢管，并使用了两个用不同厚度的碳和玻璃套管加固的填充灌浆系统进行了维修。结果表明，修复系统的性能受填充灌浆的拉伸裂纹支配。较厚的套筒和较高的抗拉强度灌浆可在维修系统中提供更大的管道容量。另一方面，高模量灌浆提供了从钢到套筒的更有效的载荷传递。使用高抗拉强度灌浆，复合修复系统可以恢复钢管的生产能力，缺陷金属损失高达70％。