Enhancing the sustainability of public works has been a key agenda in recent years for many governmental organizations. Public works contribute significantly to a large portion of engineering works and have great potential to impact the sustainability of cities. Thus, evaluating the sustainability of these projects is highly relevant, mainly regarding their impacts on environmental, social, and economic aspects. There are currently assessment systems and methods with different scopes and approaches. Yet, there remains uncertainty when it comes to considering public works’ sustainability and how useful criteria can be incorporated into the proposed assessment tasks to ensure such a goal. This study contributes to filling this gap by developing, through an extensive and detailed bibliographic research, a flexible and comprehensive framework composed of 214 criteria distributed across nine categories that measure the degree of sustainability of public works, with emphasis on economic, social and environmental goals. The proposed framework can act as a practical tool, functioning as a checklist applicable to all types of public construction works, and at any stage of the lifecycle. Evaluation of the framework by professionals indicated its suitability when encompassing sustainability objectives, its viability, and its ease of use.

This paper describes an analytical study about the bond between concrete and glued carbon fiber composites (CFCs) using data of 2 experimental researches. A total of 27 double compression-tension tests were carried out on specimens with 2 concrete cubes (fixed and movable) connected by carbon fiber strips on opposite sides. The variables were concrete strength, with the evaluation of 9 specimens with strength of 20.5 to 38.1 MPa, with monotonic loading and smooth surface for all specimens, and 18 specimens with strength of 23.2 to 40.8 MPa, with monotonic loading and loading/unloading cycles and different concrete surfaces (smooth face and rough face). The test results showed that the ultimate bond stress slightly varies according to concrete strength in the analyzed zone. The strains of CFCs and concrete were measured, allowing the calculation of bond stress and the corresponding mean strain, which were compared with the values obtained by the expression given in the international codes. The prediction of the old expression applies to steel plates strengthening method, and the results of a more recent expression of CFC glued to concrete given by fib Bulletins and Model Code 2010 are compared with test results. The experimental results provided graphs and correlation curves for bond stress vs maximum strain, energy of fracture vs bond stress and a relationship between the mean shear strain and concrete strength. The expression for fracture energy given by fib Bulletins and Model Code 2010 varies with concrete strength f c and a reasonable agreement with test data was achieved. K E Y W O R D S bond, bond by tension-compression test, carbon fiber composites

Este trabalho teve por objetivo apresentar alguns casos de fissuração do concreto em travessa de apoio de pontes em concreto. São comentados seis casos ocorridos em pontes de concreto, onde se relatam os problemas encontrados, as causas da fissuração e as possíveis soluções para estes casos. Há causas de fissuração do concreto relacionadas à corrosão das armaduras internas pela entrada de agentes agressivos no concreto ou pela corrente elétrica de fuga, e ao recalque de apoio das travessas. Verificou-se neste trabalho que a maioria das causas de fissuração se deve a falhas na execução e no projeto, detalhamento e dimensionamento desta travessa de apoio.

Ao longo dos anos, as Normas Brasileiras de dimensionamento e execução de pontes em concreto armado passaram por diversas revisões derivadas das mudanças das características de projeto, como alterações nos carregamentos e nas seções transversais. Nesse contexto, procura-se identificar as características das seções transversais típicas de diversos períodos de construções de Obras de Arte Especiais (OAE), além das principais alterações nas diretrizes normativas vigentes na época de projeto.

The present work shows the analysis of a numerical experimental test that was performed using randomized and combined data to study the bending behavior of beams, through the deflection equation considering plane stresses in two different examples. The first is a cantilever beam with force concentrated at the free end and the second is a pinned-pinned beam with loading uniformly distributed along the span. The variables width, height, length, longitudinal modulus of elasticity, deflection, and loading were used as estimated parameters to calculate the ideal width and height dimensions for each beam and obtain a structural optimization considering the limits of deformation according to ABNT NBR 6118/2014. The data generation was generated in Excel spreadsheet format and worked in an Artificial Neural Networks in TensorFlow Python language, with six hidden layers. In addition, the functions 'mae', 'sgd' and 'loss' were used as optimizers or activation function in TensorFlow.