摘要
通过对内嵌预应力碳纤维加固混凝土梁的静力加载试验,对其受力过程、破坏形态、承载力、延性和变形情况进行了分析。试验结果表明:内嵌预应力碳纤维筋加固混凝土梁能大幅度提高被加固梁的开裂荷载和极限荷载,延迟裂缝开展,改善梁的正常使用状态;有效减小加固构件的变形,延缓筋材屈服,充分利用碳纤维筋的高强性能;且随着加固量及初始预应力水平的提高,被加固试件的延性有所降低。内嵌预应力碳纤维筋加固法能有效解决现有加固方法在材料利用不充分,粘结剥离破坏等方面的缺点,是一种行之有效的加固方法。
A technique for increasing the flexural properties of concrete beams strengthened with prestressed carbon fiber in sawed grooves in the concrete cover is studied. Ten beams under monotonic loads were tested. The stressing process, failure capacity, flexural capacity, displacement ductility and deformation were studied. The test shows that the strengthening technique using carbon fiber bonding in the concrete cover can enhance the first-crack load and steel- yielding load of beams compared with the ordinary beam. It is worth noticing that the prestressed carbon fiber can limit the crack width all the way up to failure and improve the service performance of the strengthened beams. It also reduces the deformation of reinforcement and increases yield loads. The high-strength performance of carbon fiber reinforcement can be fully used. With the reinforcement amount and the initial prestressing level increased, ductility will be reduced to some extent. The embedded strengthening method with prestressing carbon fiber reinforcement can effectively solve the problems of existing strengthening method, such as the inadequate use of materials and debonding failure. It is an effective strengthening method.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2012年第2期128-134,共7页
Journal of Building Structures
基金
国家自然科学基金项目(51108161)
河南省教育厅自然科学研究项目(2009A560006)
关键词
混凝土梁
加固
预应力碳纤维筋
内嵌法
静力试验
力学性能
concrete beam
strengthening
prestressed CFRP tendon
near surface mounted
static test
mechanical property
