Study on the shear reinforcement effect of non-stirrup beams with existing cracks using different pasting angles of CFRP fabric
The presence of existing cracks has a significant impact on the shear bearing capacity of non-stirrup beams.Investigating the reinforcement effects of Carbon Fiber Reinforced Polymer(CFRP)on non-stirrup beams with pre-existing cracks provides a theoretical basis for practical engineering applications.This study examines the shear performance tests on 6 groups of specimens under different conditions to assess the influence of varying CFRP fabric application angles on the shear strength and analyzes the shear failure mechanism of beams reinforced with side-pasted CFRP fabric.The results indicate that the application angle of CFRP fabric has a significant impact on the shear reinforcement effect of beams.Reinforcement perpendicular to the cracks yields the best performance,while reinforcement parallel to the cracks is the least effective.The pre-existing cracks at the 45° side of the beam weaken the"arch effect"of the beam,reducing its shear bearing capacity and resulting in a combined tension-shear failure mode.The application of CFRP fabric effectively suppresses the propagation of diagonal cracks,enhances the shear performance,and reduces the tensile forces during the loading process.When the longitudinal tensile direction of the CFRP fabric is perpendicular to the pre-existing cracks,the ultimate load capacity can be increased by up to 71.2%.
万方数据
维普
