预载作用下碳纤维布加固木梁抗弯性能试验

Study on flexural performance of preloaded wood beams strengthened with CFRP sheets

通过7组矩形木梁抗弯试验,探讨了不同预载程度和碳纤维布层数对加固效果的影响,研究了木梁的破坏特征、荷载-挠度关系、应变分布和极限承载力。试验结果表明,采用碳纤维布提高木梁抗弯承载力的方法是有效的,粘贴1层碳纤维布的木梁极限承载力提高6.2%～12.1%,粘贴2层的效果更加明显,同时我们发现预载程度对木梁极限承载力的影响不容忽视。

Bending experiments on seven rectangular wood beams were performed in this study. The influence of preload level and carbon-fiber-reinforced-polymer （CFRP） sheet number on the flexural behavior was evaluated. The flexural behavior was examined in terms of failure characteristics, load-deflection relationship, cross-section strain distribution, and ultimate bearing capacity. The results indicated that reinforcement with CFRP sheet was an effective technique. The ultimate bearing capacity of wood beams strengthened with one layer of CFRP sheet increased about 6.2% -12.1% and the effect was more obvious with two layers of CFRP sheet. At the same time, the preload level was found to have a noticeable influence on the ultimate bearing capacity of strengthened wood beams.