波形齿夹具锚与碳纤维布U形箍锚固作用的对比试验

Comparative Experiment on Beams Strengthened with Carbon Fiber Sheets Anchored by Wave-shaped-gear-grip Anchorage and by Carbon Fiber Sheet U-ferrule

对抗弯加固的碳纤维布,其一端采用波形齿夹具锚锚固,另一端采用碳纤维布U形箍锚固,进行了4根抗弯加固梁的荷载试验。试验结果表明在碳纤维布加固量较小的情况下,碳纤维布U形箍的锚固效果对纵向碳纤维布的强度发挥是有效的;但在碳纤维布加固量较大的情况下,碳纤维布U形箍被剪断,纵向碳纤维布的强度不能充分发挥。进一步的分析表明,碳纤维布U形箍仅相当于一种柔性的约束,而波形齿夹具锚的锚固相当于一种较刚性的约束。对比试验结果充分表明,波形齿夹具锚的锚固效果优于碳纤维布U形箍。

In the experiment, one end of Carbon Fiber Sheets （CFS） is anchored by U-ferrule and the other is anchored by WSGG anchor. The test results indicate that the strengthening effect of the U-ferrule is effective when a smaller amount of CFS is used. However, all the U-ferrules in 3 RC beams are sheared to failure when a large amount of CFS is used, and the high strength of CFS fails to make full use of its strength. Further analysis on the distribution and developing of strain during the loading shows that the WSGG anchor is equivalently a rigid boundary and the U-ferrule is equivalently an elastic boundary. The U-ferrule fails to supply enough anchorage force and is prone to be sheared because it＇ s transverse shearing strength is low. The comparison demonstrates that WSGG anchor is superior than U-ferrule.