碳纤维格栅增强RC梁抗弯模型试验分析

Experimental Analysis of Bending Resistance of RC Beams Strengthened with Carbon Fiber Gratings

以CFRP格栅网格为增强材料,通过变换CFRP格栅网格宽度、厚度及嵌入保护层厚度探究增强后RC梁(钢筋混凝土梁)的破坏模式、承载力与延性的变化,CFRP材料在增强RC梁中的作用机理.模型试验结果表明,增强后RC梁的破坏模式得到明显改善,损伤范围较为均匀,钢筋与混凝土各自发挥其材性优点且当格栅网格厚度增大此特性发挥更加明显,嵌入保护层厚度为15 mm,梁整体刚度退化有所缓和,格栅网格宽度降低重分配格栅网格应力状态,受拉应力区域扩大,发挥了其抗拉特性.

The failure mode,bearing capacity and ductility of reinforced concrete beams(RC beams)were studied by changing the width and thickness of the grid and the thickness of theembedded protective layer,and the mechanism of the CFRP materials in strengthening RCbeams was discussed.The results of model test show that the failure mode of Reinforced RC beams is obviously improved,and the damage range is more uniform.The steel and concrete have their own advantages in material properties.When the thickness of grid increases,this characteristic is more obvious.The thickness of embedded protective layer is 15 mm,the overall rigidity degradation of beams is eased,the grid width is reduced,the grid stress state is redistributed,and the tensile stress is reduced The area is enlarged and its tensile properties are brought into play.