Evaluation of Flexural Behavior of Textile-Reinforced Mortar-Strengthened RC Beam Considering Strengthening Limit

Textile-reinforced mortar (TRM) is a strengthening material in which textiles are attached to reinforced concrete (RC) structures using an inorganic matrix. Although many studies on structural behavior, various factors that affect TRM behavior could not be determined clearly. Especially, the uncertainty in bonds due to inorganic materials was not considered. In this study, the flexural behavior of TRM-strengthened beams was determined considering intermediate crack debonding occurred. The TRM beam strengthening limit and TRM coefficients were defined considering the possibility of premature failure and experimental results of four other research on 22 specimens. Therefore, it is expected that a conservative design would be possible when the suggested strengthening limit coefficient is applied.

Influence of Contact of Damaged Reinforced Concrete Beam and Strengthening Slab for Deformation and Resistance of Reinforced Element in the Long-Term Loading

Experimental and theoretical research oriented on the influence of the time factor to limit states of damaged and then reinforced beams by the strengthening slab. In experiments there were performed two types of contact - reinforced contact (beams ST) "damaged beam / strengthening slab", respectively unreinforced contact with geometric indented modification (beams Z). Both types are based on rules EC2 for short-term load. The results are compared with short-term tests of both types of contact. In long-term studies, we have used as comparative values results for unreinforced beams (beams LTL-n). In both cases the creep coefficients are set for the following variables - total deflection a (tot), and the deflections a (sh) of shear, and the a (fl) the bending moment, the shear deformation γ, curvature ρ. All tests were carried out at the level of loading γ = 0.50. The determining of the creep coefficients was based on the experimental deformation of the fictitious truss system, which have been processed by Williot-Mohr translocation patterns. The results form the input values for the experimental elements in repetitive loading at the same level load.