Análise da influência do grauteamento e da posição das armaduras na ligação viga-pilar em estruturas de concreto pré-moldado

Abstract

The study of connections between the elements of precast concrete structures is of great importance, because the performance of a structural system is directly related to the connections. It presents a study of a semi-rigid interior beam-column connection, which corresponds to a precast concrete beam supported on grout in precast concrete corbel and the presence of continuity reinforced bars. This work had as main objective to verify the influence of filling with grout in the vertical interface between the corbel and the beam, and of the continuity reinforced position, passing inside the column or the slab. To achieve the goals, eight specimens will be tested, as follows: two specimens with the continuity reinforced bars passing the slab and grouting in vertical interface between the corbel and the lower beam; two specimens with the continuity reinforced bars passing the slab and without grout in the vertical interface between the corbel and the lower beam; two specimens with the continuity reinforced bars passing inside the column and with grout in the vertical interface between the corbel and the lower beam; two specimens with continuity reinforced bars passing inside the column and without grout in the vertical interface between the corbel and the lower beam. They were applied two analytical models to verify its use for estimating the stiffness of the connections. The experimental results indicated a good bending moment capacity of connections, where they had a higher strength capacity estimated by all calculation models applied in this work. It was also found that filling of grout contributed to increase the stiffness and strength of connections and passing continuity reinforcement of the slab provided a greater distribution of cracks, and lower cracks openings.