CFRP采用预应力卸载法补强RC梁的理论分析及试验研究

Analysis and Research of Prestressed Unloaded Technique of RC Beams Strengthened With CFRP

针对现有的碳纤维补强加固技术往往不能使其强度得到充分发挥的问题,提出碳纤维补强钢筋混凝土梁的新技术——预应力卸载法,介绍了这种技术的设计思路,推导出适用于该技术的理论分析计算公式.该技术在宜昌市境内的龙潭河桥修建工程中进行了尝试应用,将理论分析数据和实测数据从纵向和横向2个方面进行对比分析,验证了该方法是行之有效的.

Aiming at the problem that the current CFRP strengthening technique usually can＇t make its strength get well exertive, this paper puts forward a new CFRP strengthening the prestressed unloaded technique. The paper will make a detailed introduction on the process of design. By the entire proceeding theoretical analysis, the paper deduces out theoretical formula. This technique was firstly used in the Long Tan-he bridge at Yi Chang. And by the data comparative analysis, it is verified that this technique is effective. The research results can be used to give reference to the application and research of CFRP to strengthen and rehabilitate bridge structure.