卸载与不卸载的RC梁桥粘贴碳纤维布加固计算

通过对5片实桥模型T型梁进行破坏试验,研究了粘贴碳纤维布数量和卸载与不卸载加固对钢筋混凝土T型梁抗弯承载能力的影响,讨论了粘贴碳纤维布梁的破坏状态:塑性受压破坏、纤维断裂破坏、粘结破坏、剪切破坏、剥离破坏。在模型梁试验的基础上,提出了粘贴碳纤维布加固钢筋混凝土简支T型梁的抗弯承载力计算方法,针对不同破坏形态讨论了不同的计算方法并予以一定简化,与试验结果比较表明:该方法准确有效,可为桥梁工程加固实践提供试验参考和依据。

Research on rehabilitation with CFRP laminates of RC beam bridges under loading and unloading case

Five reinforced concrete T beams which are modelled from real bridges are tested in this research. The beams are applied in different layers of CFRP laminates with different initial loads. The ultimate flexural capacity of the beams is investigated and analyzed,and then,authors provide failure state of beams rehabilitated by CFRP: plastic bearing failure; CFRP rupture; debonding failure;shear failure; strips failure. Based on the experiment of model T beams, authors present the research on evaluating the ultimate flexural capacity of reinforced concrete T bridges strengthened with CFRP laminates. Corresponding with different failure modes, several calculating methods are discussed and simplified. The results obtained from the experiment show the accuracy and service ability. Authors aim at providing references and guidelines to the practical bridge rehabilitation project.