CFRP嵌入式加固砌体结构抗弯性能试验研究

Experimental study of out-of-plane flexural performance of masonry structures strengthened with near-surface mounted carbon fiber reinforced polymer

采用环氧树脂胶和碳纤维布制成CFRP条状试样,黏结环氧树脂胶嵌入到预先在砌体结构表面设置的槽中,研究了嵌入式CFRP与砌体凹槽粘结强度的影响因素,及嵌入CFRP对砌体结构平面外抗弯性能的影响。研究结果表明,增加CFRP层数及宽度均可提高CFRP与砌体粘结强度,然而却降低了CFRP效率发挥系数,CFRP效率发挥系数与CFRP横截面周长与横截面面积之比正相关,且短切碳纤维增强环氧树脂胶可提高CFRP与砌体粘结性能,另外,嵌入式CFRP加固砌体结构大大提高了砌体结构的极限承载力及延性。

In this experimental research,CFRP strips were fabricated by epoxy resins glue and carbon fiber polymer sheets,and embedded in grooves pre-cut in the near-surface ＇of masonry which attached with epoxy resin glue,then the several factors which af- fect the bond strength of the CFRP strips embedded, and the influence of near-surface mounted CNSM） CFRP on the out--of-plane flexural performance ＇of masonry structures strengthened were studied. The test results showed that,increasing the NSM CFRP thickness and the NSM CFRP width canld increase the bond strength of the NSM CFRP strips. However the CFRP efficiency was reduced,the CFRP efficiency was in proportion to the ratio of the NSM CFRP cross sectional perimeter to cross sectional area, and the epoxy resin glue strengthened with short carbon fiber enhanced significantly its bond strength with the＇ masonry. In addition, the results also showed that, strengthened with NSM CFRP, the strength and ductility of the＂ masonry structures specimens was increased significantly.