预应力碳纤维布加固一次二次受力梁抗弯试验研究

就CFRP布加固RC梁的未加预应力、施加顸应力以及施加预应力后梁的未有初始应力(一次受力)、有初始应力(二次受力)等不同工况共八根梁进行了对比试验，同时进行了锚固端不同锚固方式共五种工况的加固效果的对比试验。试验结果分析表明：CFRP布预应力施加方法简便且易在加固施工实践中应用；CFRP布施加预应力在加固效果上明显优于不加预应力的加固方法；施加预应力加固时必须在端头锚固且锚固效果良好。

Experimental Study on Primary and Secondary Load for RC Beam Strengthened with Prestressed CFRP Sheet

In this paper,the experimental process and results of RC beam strengthened with CFRP sheets are introduced,which includes different work conditions,such as non-prestressed contrasting with prestressed CFRP sheets and primary contrasting with secondary load acting.Meanwhile the experimental results of non-anchored contrasting with anchored RC beam are also presented.The analysing results indicate that the method of creating prestress can be conveniently applied on strengthening engineering,the strengthening effect of prestressed CFRP sheets contrasting with non-prestressed CFRP sheets is obviously.When RC beams are strengthened with prestressed CFRP sheets,we must use U-type CFRP sheet or steel plate, the anchor effect is good.