通过碳纤维布(CFRP)和玻璃纤维布(GFRP)全裹黏贴加固与条带间隔黏贴加固混凝土圆柱在盐溶液干湿循环作用下的轴心受压试验,对比分析环境作用、纤维布类型、纤维布黏贴方式对混凝土圆柱轴压性能的影响.结果表明,经过盐溶液干湿循环作用之后,FRP加固混凝土圆柱的强度和延性有所降低,CFRP加固柱比GFRP加固柱耐干湿循环性能好.如果从提高强度、抗震能力、耐久性方面考虑,全裹黏贴方式优于条带间隔黏贴方式,在盐溶液干湿循环环境下,可以考虑采用FRP全裹黏贴加固混凝土结构,在提高混凝土结构受力性能的同时,以全裹黏贴加固方式来延缓外界环境对混凝土的侵蚀,延长混凝土结构的寿命.但从经济方面考虑,FRP约束对圆柱强度的提高程度并不与FRP用量成正比,条带黏贴方式比全裹黏贴方式更经济.建立了考虑盐溶液干湿循环影响的FRP条带柱与全裹柱的承载力计算模型.%The effects of the environment, FRP type and bonding manner on the durability of concrete cylinders were studied by comparing the compressive performance of specimens confined with carbon fiber reinforced polymer (CFRP), glass fiber reinforced polymer (GFRP) wraps and without any wrap, under wet-dry cycles in salt solution. The experimental resuhs show that strength and ductility of FRP strengthened concrete cylinders decrease after wet-dry cycles in salt solution. Concrete cylinders confined with CFRP are more resistant to wet-dry cycles in salt solution than those cylinders confined with GFRP. In terms of improving strength, earthquake-resistant capacity and durability of concrete structure, the entirely-wrapped specimens perform better than those strip-wrapped ones. The entire-wrap can be adopted when using FRP to strengthen concrete structures under wet-dry cycles in salt solution, in order to improve the mechanical performance of the concrete structure, defer orrosive attack of deleterious media to the concrete, and thus prolong the life-period of concrete structures. On the other hand, however, in terms of economy, the degree of strength increase due to FRP is not directly proportional to the amount of FRP, and the strip-wrap is more economical. A model is proposed to calculate the strength of FRP entirely-wrapped concrete cylinders and FRP strip-wrapped concrete cylinders under wet-dry cycles in salt solution.
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