碳纤维布采用预应力卸载法加固钢筋混凝土空心板桥的分析研究

Analysis and Research of Prestressed Unloaded Technique of RC Hollow Slab Bridges Strengthened with CFRP

为了充分利用碳纤维材料强度,提出新的碳纤维加固技术——预应力卸载法。结合宜昌市境内的龙潭河桥修建工程,详细论述了这种技术的设计思路和施工工艺,通过单梁荷载试验,验证了预应力卸载法的可行性。研究成果对今后粘贴碳纤维加固法在桥梁工程中的应用与研究有一定的指导意义。

As a high performance structural strengthening material, the carbon fiber reinforced polymer （CFRP） has been used widely in bridge engineering especially in strengthening of bridges at home and abroad. But the current CFRP strengthening technique usually can＇t make its strength get well exertive. For this, this paper puts forward a new CFRP strengthening technique--the prestressed unloaded technique. With the background of the Longtanhe Bridge in Yichang, this paper make a detailed introduction on the process of design and construction of this technique. And from field test of concrete beams with CFRP, it is verified that this technique is effective and practical. The research results can be used to give reference to the application and research of CFRP to strengthen and rehabilitate bridge structure.