Abstract
Abstract This work is based on an experimental investigation of reinforced concrete beams strengthened to flexure for wrapping applying a type of metallic connector in the bond substrate/groute. The experimental program consisted of 5 beams used for reference (without strengthening), 5 beams reinforced with surface brushed texture substrate and 5 beams with metal connectors bonded to the substrate. The beams were submitted to four-point load bending test. Initially with a partial loading, executed the strengthening and were finally tested until the break. The strengthening was made up by the increase by graute, on the sides and bottom of the beam and reinforcing. The applied force, the displacement, deformations in steel and in concrete were measured. The reference beams failure by flexing with the calculated charges. The bending strengthening proved efficient, increasing the bearing capacity in 44% and the failure was by shear in the stretch without strengthening. Beams with connectors the increase was higher.
Highlights
And may still be, the reality of constructions in Brazil shows that the number of structures in reinforced concrete susceptible to rehabilitation increases as they age
It is verified that the modulus of elasticity reached the value compatible with the estimated by the NBR 6118 [7] equation
F is the value calculated according to the level of significance and the degrees of freedom of the variances between and within the samples
Summary
And may still be, the reality of constructions in Brazil shows that the number of structures in reinforced concrete susceptible to rehabilitation increases as they age. One of the variables is the connection between elements shaped at different ages, being one of the factors that can have serious consequences when not properly analyzed and projected This linkage, between substrate and new concrete, is determinant for the performance, durability and effectiveness of all structural recovery or strengthening services, it is of fundamental importance to know its influence. The introduction of opposing forces can be promoted by the use of struts, wires or rods, being able to increase the strength of the structural element through a vertical component contrary to those caused by external and permanent loads To this end, diverter devices may be placed between the tendons and the structure to deflect the tendon as required. The use of connectors in the bonding interface promotes increased resistance to shearing stresses, and the adoption of connectors across the interface between substrate and new concrete is a feature widely used to obtain the monolithic behavior of the reinforced part (FIB [1])
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