预应力CFRP布及预紧螺栓加固RC梁试验研究
发布时间：2018-08-21 11:41
【摘要】：为提高碳纤维布加固RC结构的效果及其可靠性,提出了预应力碳纤维布与预紧螺栓联合加固技术。结合在役RC梁的损伤特点及目前的RC梁加固方法,分别采用不同的碳纤维布加固技术对完整梁和破坏梁的抗弯性能进行了对比试验研究。针对目前碳纤维布张拉设备的缺陷,研发了便于现场应用的新型碳纤维布布张拉设备,分析了预应力大小对加固效果的影响。结果表明,预应力碳纤维布及预紧螺栓联合加固技术是一种更可靠的桥梁加固方法,不仅能够提高RC梁正截面的抗弯承载能力及正常使用阶段的截面刚度,而且螺栓预紧锚固碳纤维布能够很好地抑制其在混凝土表面的剥离,提高碳纤维布与混凝土表面之间粘结强度,对碳纤维布施加预应力能够充分发挥其高强性能,有效抑制混凝土裂缝开裂和开展。
[Abstract]:In order to improve the effect and reliability of RC structure strengthened with CFRP, a new technique of prestressed CFRP and prestressing bolt is proposed. Combined with the damage characteristics of in-service RC beams and the present reinforcement methods of RC beams, the flexural behavior of intact and damaged RC beams was studied by using different CFRP reinforcement techniques. In view of the defects of the present carbon fiber tensioning equipment, a new type of carbon fiber cloth tensioning equipment is developed, which is convenient for field application, and the influence of the prestressing force on the reinforcement effect is analyzed. The results show that the combination of prestressed carbon fiber cloth and pre-tightening bolt is a more reliable method for bridge strengthening, which can not only improve the flexural bearing capacity of RC beam section and the stiffness of RC beam in normal service stage. Moreover, bolt pre-anchoring carbon fiber cloth can restrain its peeling on concrete surface, improve the bond strength between carbon fiber cloth and concrete surface, apply prestressing force to carbon fiber sheet can give full play to its high strength performance. Effectively suppress crack cracking and development of concrete.
【作者单位】： 山东大学土建与水利学院;济南市公路管理局;
【基金】：山东省自然科学基金(ZR2013EEM025) 山东大学自主创新基金(2012ZD032)~~
【分类号】：TU378.1
本文编号：2195603
[Abstract]:In order to improve the effect and reliability of RC structure strengthened with CFRP, a new technique of prestressed CFRP and prestressing bolt is proposed. Combined with the damage characteristics of in-service RC beams and the present reinforcement methods of RC beams, the flexural behavior of intact and damaged RC beams was studied by using different CFRP reinforcement techniques. In view of the defects of the present carbon fiber tensioning equipment, a new type of carbon fiber cloth tensioning equipment is developed, which is convenient for field application, and the influence of the prestressing force on the reinforcement effect is analyzed. The results show that the combination of prestressed carbon fiber cloth and pre-tightening bolt is a more reliable method for bridge strengthening, which can not only improve the flexural bearing capacity of RC beam section and the stiffness of RC beam in normal service stage. Moreover, bolt pre-anchoring carbon fiber cloth can restrain its peeling on concrete surface, improve the bond strength between carbon fiber cloth and concrete surface, apply prestressing force to carbon fiber sheet can give full play to its high strength performance. Effectively suppress crack cracking and development of concrete.
【作者单位】： 山东大学土建与水利学院;济南市公路管理局;
【基金】：山东省自然科学基金(ZR2013EEM025) 山东大学自主创新基金(2012ZD032)~~
【分类号】：TU378.1
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