基于11根纤维布(9根玻璃纤维布、1根碳纤维布和1根混杂纤维布)粘贴钢砼大偏压柱和1根对比柱在单调荷载作用下的试验结果,分析加固柱的破坏特征、受力性能和作用机理.结果表明:加固柱的破坏特征仍为塑性破坏,其强度和变形特性变化主要与纤维布粘贴层数、加固宽度、加固间距、粘贴方式和纤维布种类等这几个因素有关,存在一个能使承载力最大的最优加固宽度、加固间距和加固层数[1],纤维布强度越高承载力的提高程度越大;纵横向粘贴方式能使大偏压柱的强度和廷性都得到改善,纵向粘贴方式只能提高加固柱的承载力,不能改善柱子的延性,纵横向粘贴方式时加固柱的承载力提高程度明显高于纵向粘贴时的加固柱的承载力的提高程度,加固效果明显.%Based on comparative experiment on 12 large-eccentrically compressed RC columns consolidated with FRP sheets (nine columns with GFRP, one column with CFRP, one column with hybrid fiber,and one unstrengthened column) under eccentric simply loaded action, the failure characteristics, loading performance and action mechanism of the strengthened columns were analyzed. The results indicated that the failure of the columns remained to be plastic destruction. Their change in strength and deformation depended mainly on such factors as the number of fiber cloth layers, width of anchor, anchor spacing, pasting method and fiber types. There would be a certain anchorage width, anchorage spacing, and number of anchorage reinforcement layers to make the bearing capacity of the columns maximum. The higher the fiber strength was, the improvement on their bearing capacity would be greater. Crossing fiber-pasting could make both the columns’ strength and ductility improved. The longitudinal pasting could improve the bearing capacity of reinforced columns only, without improvement on the ductility of the column. Using longitudinally-transversally crossing mode, the improvement on bearing capacity of reinforced columns was significantly higher than that with longitudinal mode only. Its reinforcement effect was remarkable.
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