预应力CFRP布加固混凝土大偏心受压柱试验研究

Experimental Study on Reinforcement for Large-eccentrically Compressed RC Column with Prestressed CFRP

为改善被加固混凝土大偏心受压柱的受力性能,提出在柱周缠绕粘贴CFRP布、柱受拉侧粘贴CFRP布复合加固技术。设计了四根尺寸、材料与配筋均相同的混凝土大偏心受压柱,分别采用不同加固方式加固,通过静力加载试验,研究预应力CFRP布加固柱的受力性能,分析不同加固方式的加固效果。研究表明,大偏压柱在纵、横向分别粘CFRP布加固后,柱的承载力有了明显的提高,裂缝分布均匀且裂缝宽度小,延性明显提高。

In order to improve the capacity of large-eccentrically compressed RC columns, a new composite reinforcement technique pasting CFRP on both the round and pulled sides of the column is put forward. Four large-eccentrically com- pressed RC columns with same size, material and reinforcement are designed, which are reinforced with different strengthening modes. Then through static loading experiments, the mechanical properties of the columns reinforced by prestressed CFRP are studied, and the impacts of the concrete columns in different reinforcement modes are analyzed. The research shows that when the reinforcement is made by pasting CFRP on both vertical and horizontal sides of the large-eccentrically compressed RC columns, the bearing capacity of the columns is enhenced obviously, the cracks are evenly distributed and the crack width becomes small, simultaneously, the ductility is evidently improved.