O trabalho apresenta o estudo de caso de manifestações patológicas em estruturas de concreto, localizadas no Eixo Rodoviário Norte de Brasília, por meio da metodologia GDE/UnB, que qualifica e quantifica a degradação de danos estruturais. Foi realizada a caracterização do estado geral da estrutura com a finalidade de servir de subsidio para tomadas de decisões quanto a intervenções rotineiras, de forma a ampliar a vida útil da estrutura. A rotina metodológica consiste na realização de inspeções em campo, catálogo das manifestações patológicas estruturais com levantamento fotográfico, caracterização dos fenômenos patológicos e classificação segundo os fatores de ponderação e fatores de intensidade de danos da estrutura conforme a metodologia GDE/UnB para obras de arte especiais, cálculo e classificação global dos danos da estrutura.

This study experimentally assessed the behavior of interior slab-column connection in a system of reinforced concrete slabs subjected to symmetrical loading, with anchorage variation of shear reinforcement. Eight slab models (with equal flexural reinforcement and same dimensions) were assessed, being seven with shear reinforcement (different anchorages of shear reinforcement in the flexural reinforcement) and one slab for reference only reinforced for flexion.Experimental data were compared with the theoretical methods established by the following code designs: ACI 318 (2019), Eurocode 2 (2004), ABNT NBR 6118 (2014), and fib Model Code (2010). Although anchoring is an important parameter, it was found that the anchorage of the shear reinforcement in the flexural reinforcement did not significantly interfere with punching shear. The adopted shear reinforcement anchoring obtained better results concerning ultimate load only in the compressed longitudinal reinforcements.

The paper presents the tridimensional numeric model of an inner slab‐column connection of reinforced concrete, which was previously tested against the punching shear in the lab of the University of Brasília. The numerical analysis has been carried out by the finite element method, using the software ABAQUS. To evaluate the sensitivity of the main factors that influence the responses of the model, a parametric investigation was conducted as per the finite element mesh, mechanical properties of the concrete and plastic parameters of the assumed model for the concrete, named by concrete damaged plasticity model (CDPM). The results of the resistance capacity, displacements, strains, cracking pattern, and failure mode were compared with those obtained experimentally. From this comparison, it was concluded that the numerical model was able to reproduce the punching shear phenomenon with a high level of precision.

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