无机黏结材料粘贴碳纤维加固混凝土梁受弯性能的试验研究

对5根混凝土梁进行受弯试验研究,比较分析采用不同胶体及不同纤维粘贴层数对碳纤维加固混凝土梁的承载力、刚度、延性、裂缝发展和分布以及破坏形态的影响。试验结果表明:试验采用的无机黏结材料MOC具有良好的黏结性能,能够用于粘贴碳纤维布加固补强混凝土构件;采用无机黏结材料粘贴碳纤维布后,加固梁的抗弯承载力明显提高,同时可以有效限制裂缝的开展,但加固梁的延性有所降低;随着碳纤维布粘贴层数的增加,加固梁的破坏模式由碳纤维布拉断破坏变为剥离破坏。

FLEXURAL BEHAVIOR OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH CFRP SHEETS BONDED WITH INORGANIC MATRIX

Five RC beams strengthened with CFRP using MOC were tested.Crack patterns,failure modes,strength improvements and stiffness behavior were studied.In the mean time,the influence of the layer of CFRP on the performance of strengthened beams was also investigated.The test results show that using MOC as the adhesive to bond CFRP to an RC member is executable.Load-bearing capacity of the RC beams increased with the number of layers of CFRP while the ductility of those beams is reduced compared to the control beam.The failure modes changed from rupture of CFRP to CFRP delamination by increasing the layer.