剪力键连接新旧混凝土黏结性能研究

Study on the Bond Behavior Connected New-to-old Concrete by Shear Connector

采用剪力键连接新旧混凝土,增强新旧混凝土结合面的抗剪能力,对5组共15个新旧混凝土结合试件进行了抗剪试验,研究不同剪力键连接形式对新旧混凝土抗剪性能的影响。试验结果表明,增设剪力键可以大幅提高试件混凝土新旧界面的共同作用,增加剪力键的锚栓数量是提高承载力的主要因素,而剪力键的加固总长度和剪力键形式对试件承载力的影响次之。

In order to improve the anti-shear capacity of interface on the new-to-old concrete,the new-toold concrete is connected by the shear connector. There are 15 new-to-old concrete specimens（ 5 series）,which are carried with the shearing test. The effect on anti-shear capacity of different connecting forms of shear connector types is researched. The test result shows that the combined effect of interface is significantly increased. The number of anchor bolt is the major factor of improving bearing capacity. The total strengthening length and type of shear connector have secondary effects on the specimen bearing capacity.