Experimental Study On The Flexural Behavior Of RC Slabs Strengthened With HPFL

On account of the advantages such as good effect, easy construction,durability, high temperature resistance, good compatibility and workingharmony with the original structural concrete, HPFL (High PerformanceFerrocement Laminate) reinforcement method arounded widespreadconcern and attention in the RC structure reinforcement area. In thispaper, experimental research of the HPFL method was applied on theflexural properties of RC board.First of all, static loading experiment was carried out on three fullscale slabs with the length of1.5m and the thickness of80mm, one ofwhich was the comparison slab, and the remaining two pieces were thereinforcement slabs. The damaged comparison slab was then reinforcedagain, and static loading test was carried out to observe the crackdevelopment of reinforcement slab under vertical uniform loading, and tomeasure the stress and deformation of the structure. The load-bearingcapacity of the structure, the crack resistance and the bearing capacity ofthe slabs were analyzed. This paper summarized the factors thatinfluenced the flexural capacity of concrete slabs with HPFLreinforcement method, and compared the ultimate bearing capacity of thereinforced slab and comparison slab. The test results showed that thebearing capacity of the reinforcement slab improved significantly,especially the primary load reinforcement slabs of JG1and JG2bothincreased118%, also the bearing capacity of unloaded reinforcementslabs increased64%, and it could be seen from the load-deflection curvethat the stiffness of JG1and JG2increased significantly.This paper theoretically analyzed the test of strengthening slabs withHPFL by the plastic hinge line theory, and derived the bearing capacityformula of primary load reinforcement slab and secondary loadreinforcement slab with HPFL and the formula for calculating themaximum reinforcement ratio of the reinforcement layer. Also thetheoretical calculations and experimental results were compared andanalyzed. The test resulted show that: The theoretical calculation value of the comparison slab DB1and the reinforcement slab JG2agreed wellwith the experimental value. The difference of the JG2was7.5%. And theexperimental value of the reinforcement slab JG1and JG3was much lessthan the theoretical calculation value, and this verified the destruction ofthe two reinforcement slabs was not completely bending failure. It can beseen from the theoretical calculation that the larger the reinforcementratio of the reinforcement layer, the higher the bearing capacity of theslab.Finally, this paper studied the bending capacity of the RC slabs withHPFL through the ANSYS finite element software, and analyzed theinfluence of the reinforcement ratio of the reinforced steel meshes on theflexural properties of the slabs. The finite element analysis, the theoreticalcalculations and the experimental results were compared and analyzed.The results showed that: The bearing capacity of the slab strengthenedwith HPFL improved greatly, and this verified that the HPFLreinforcement method could effectively improve the flexural capacity ofthe RC slabs.