论文部分内容阅读
通过试验研究介绍采用碳纤维片材嵌入式技术抗剪加固钢筋混凝土T型梁的效果。试验考虑了嵌入片材的3种角度(45°,60°和90°)以及3个不同的碳纤维片材用量。嵌入式加固梁的配箍率为0·10%。片材最高用量按照对比梁中钢筋配箍率为0·28%时所能够承担的最大荷载进行设计。结果表明:斜片材的效果优于竖直片材的效果;片材用量的增加导致梁的抗剪承载力增加;片材对梁抗剪能力的贡献受到混凝土抗拉强度的限制;梁的破坏模式受片材加固量的影响。对于每一种片材加固量,同时根据外贴碳纤维布技术,对相同构件采用连续U型碳纤维布箍加固后进行试验,对比了两种碳纤维材料加固技术的效果。结果表明:嵌入式加固技术更有效,不仅提高了梁的抗剪能力,同时,碳纤维材料的抗拉强度得到更充分的发挥。除了碳纤维片材用量最高的梁以外,采用嵌入式加固梁在破坏时的变形方面比外贴加固技术更有效。ACI和FIB的分析公式中预测的外贴加固对抗剪加固体系的贡献比相应的试验值更大,根据Nanni等人的公式可知,嵌入式加固技术使得碳纤维片材的贡献大约达到试验值的61%。
The effect of shearing reinforced concrete T-beams using carbon fiber sheet embedding technology is introduced through experimental study. The test considered three angles (45 °, 60 °, and 90 °) of the embedded sheet and three different carbon fiber sheets. The stirrup ratio of the embedded reinforcement beam is 0 · 10%. The maximum amount of sheet material is designed according to the maximum load that can be carried out when the stirrup ratio in the beam is 0 · 28%. The results show that the effect of slant sheet is better than that of vertical sheet. The increase of the amount of sheet leads to the increase of the shear resistance of the beam. The contribution of the sheet to the beam shear resistance is limited by the tensile strength of the concrete. Damage modes are affected by the amount of sheet reinforcement. For each sheet of reinforcement, at the same time according to the technology of external carbon fiber cloth, the same components using continuous U-shaped carbon fiber cloth hoop reinforced test, compared the two carbon fiber material reinforcement effect. The results show that the embedded reinforcement technology is more effective, which not only improves the shear resistance of the beam, but also gives more full play to the tensile strength of the carbon fiber material. In addition to the highest amount of carbon fiber sheet beam, the use of embedded reinforcement beams in the destruction of the deformation than the external reinforcement technology more effective. According to the formula of Nanni et al., The contribution of embedded reinforcement technology to the carbon fiber sheet reaches about the value of the experimental value by predicting the contribution of the externally applied reinforcement to the shear reinforcement system in the analytical formulas of ACI and FIB 61%.