Experimental And Finite Element Analysis Of Permealility Polymer Mortar-Reinforced Hollow Slab

With the development of China’s transportation industry,the traffic volume is increasing,vehicle loads are increasing rapidly,and a series of diseases such as broken carbonization and corrosion of steel bars have occurred in existing concrete bridges.The maintenance and reinforcement of bridges have attracted the attention of relevant departments and researchers.Permeability polymer mortar-reinforced reinforcement technology is used as the bottom of the beam to prepare stainless steel strands(reinforcing bars),and a new type of reinforcement method that applies permeable polymer mortar as a joint material is born.At present,some results have been achieved in the theoretical research and technical promotion of the stainless steel stranded wire-permeable polymer mortar reinforcement method,but the mechanism research and technical application of ordinary reinforced steel-permeable polymer mortar reinforcement is still in its infancy.Aiming at the shortcomings in the research of permeable polymer mortar-reinforced composite reinforcement,a 1/2 scale test of 8m hollow slab was carried out to study the mechanical characteristics of RC beam strengthened with permeable polymer mortar-reinforced composite.By comparing and analyzing the failure mode,crack development pattern,loaddisplacement curve,and steel bar strain curve of each bending test beam.The results show that the concrete test beams strengthened with permeable polymer mortar-reinforced composites have improved bending capacity by about 39.27%、44.13%、171.26% and 138.87% compared to unreinforced beams,and their bending capacity is significantly improved.The stiffness of the test beam has also been improved,the gap between the main cracks of the test beam has been reduced,the cracks have developed slowly,and the reinforcement effect is obvious.In order to verify the rationality of the test results,a numerical analysis model of permeability polymer mortar-reinforced hollow slab was established with the aid nonlinear finite element software.The stress and strain are calculated and analyzed,and the results obtained by numerical simulation agree well with the experimental values.Based on experiments and nonlinear finite element simulations,the effects of different reinforcement types(including different reinforcement reinforcement ratios,different reinforcement reinforcement grades)on the bending capacity of the test beam are analyzed,and the results show that increasing the reinforcement Compared with the same reinforcement ratio,the effect of increasing the reinforcement level on the test beam is obvious.Under the premise of conforming to the design specifications of concrete structures,increasing the reinforcement ratio and increasing the reinforcement level at the same time is more obvious on the reinforcement of the test beam.In order to verify the effectiveness of the reinforcement test,using price balance as a constraint,additional 2 test beams reinforced with steel plates and 2 test beams reinforced with carbon fiber plates were compared and analyzed with permeability polymer mortar-reinforced reinforcement.It shows that permeability polymer mortar-reinforced reinforcement is better than the steel plate and carbon fiber reinforcement in improving the bending bearing capacity,reducing the mid-span deflection of the test beam,and inhibiting the development of cracks.Traditional reinforcement methods.