纤维网格布钢筋混凝土梁受弯性能试验研究OA

To investigate the flexural behavior of reinforced concrete beams with fiber mesh fabric,seven beam specimens were designed and fabricated,including one reinforced concrete(RC)control beam and six reinforced concrete beams with fiber mesh fabric,with mesh type and unit grammage as the main vari-ables.Four-point bending tests were conducted to examine the influence of fiber mesh fabric on the flexural performance of the specimens,and the effects of different parameters on failure mode,stiffness,load-carry-ing capacity,crack resistance,and crack control were analyzed.The results showed that all beam speci-mens exhibited under-reinforced failure.Compared with the RC control beam,the reinforced concrete beams with fiber mesh fabric showed maximum increases of 19.9%,6.9%,and 10.7%in cracking load,yield load,and ultimate load,respectively,and exhibited clear advantages in stiffness and crack control.Under the same unit grammage,the cracking load of the carbon fiber reinforced polymer(CFRP)mesh-fab-ric reinforced concrete beams was up to 6.4%higher than that of the glass fiber reinforced polymer(GFRP)mesh-fabric reinforced concrete beams,whereas the ultimate load of the GFRP mesh-fabric reinforced con-crete beams was up to 7.7%higher than that of the CFRP mesh-fabric reinforced concrete beams;more-over,the maximum crack width of the GFRP mesh-fabric reinforced concrete beams was consistently small-er than that of the CFRP mesh-fabric reinforced concrete beams.These results indicate that CFRP mesh fab-ric is more effective in improving crack resistance,whereas GFRP mesh fabric is more beneficial for en-hancing ultimate load capacity and crack control.When the unit grammage increased from 120 g/m2 to 300 g/m2,the cracking load and ultimate load of the GFRP group increased by 14.0%and 6.7%,respectively,while the cracking load of the CFRP group increased by 12.0%and its ultimate load decreased by 2.2%.In-creasing the unit grammage improved the crack resistance of the beams and was beneficial for enhancing the ultimate load capacity of the GFRP mesh-fabric reinforced concrete beams,but had only a limited effect on that of the CFRP mesh-fabric reinforced concrete beams.