https://repositorio.ufu.br/handle/123456789/5144 2026-09-14T21:46:34Z 2026-09-14T21:46:34Z https://repositorio.ufu.br/handle/123456789/50100 2026-09-04T06:31:30Z 2026-07-09T00:00:00Z

Title: Sistematização do cálculo da capacidade de carga e previsão de recalque em fundações Abstract: The design of deep foundations is essential to ensure the safety and structural performance of buildings, with piles serving as fundamental elements in transferring loads to the soil. In this work, an automated calculation spreadsheet was developed to evaluate the loadbearing capacity and settlement of piles, using exclusively field data obtained through the Standard Penetration Test (SPT). Some of the main well-established methods from the literature were integrated, with the aim of creating a reliable and user-friendly tool. The proposed spreadsheet enables calculations to be carried out quickly and in a standardized manner, minimizing errors and facilitating decision-making during the design phase. It is expected that this tool will contribute to everyday practice in the development of foundation projects, promoting greater efficiency and safety.

2026-07-09T00:00:00Z https://repositorio.ufu.br/handle/123456789/50050 2026-09-04T06:31:48Z 2026-03-20T00:00:00Z

Title: Análise numérica da inserção de enrijecedores de alma em terças de aço formado a frio Abstract: Cold-formed steel profiles constitute an efficient and versatile structural solution in civil engineering, standing out for their high strength-to-weight ratio, dimensional precision, and wide applicability in modern construction systems. This study addresses the analysis of the structural behavior of cold-formed steel profiles, with emphasis on the influence of web stiffeners and slenderness variation on the structural performance of these elements. The research was developed through numerical modeling using the Finite Element Method, with the aid of Abaqus software, enabling the evaluation of the critical moment and the instability modes associated with the analyzed profiles. The results indicate that the use of stiffeners can significantly contribute to increasing the load-bearing capacity of the profiles, especially in situations where local buckling predominates. However, it was observed that, in certain cases, the insertion of these elements does not result in structural gains, particularly when the behavior is governed by global instabilities. Thus, the study highlights the importance of a careful analysis of geometric and mechanical parameters in the design of cold-formed steel profiles, contributing to the development of more efficient, safe, and economically viable solutions in structural engineering.

2026-03-20T00:00:00Z https://repositorio.ufu.br/handle/123456789/50045 2026-09-04T06:28:03Z 2024-04-19T00:00:00Z

Title: Ddimensionamento a flexão de vigas de concreto armado com protensão não aderente Abstract: In this work, the bending design of a prestressed concrete beam for a hypothetical residential building is developed. The analysis of prestress losses is carried out, considering both immediate and progressive losses, and assessing their effects on limit states for the design of a 17-meter post-tensioned rectangular beam with non-bonded prestressing. The study begins with a review of theoretical principles of prestressing and major sources of losses. Subsequently, calculation methods are presented to quantify immediate and progressive losses, using analytical models. Finally, checks are performed on serviceability and ultimate limit states. This work provides a procedure for the bending design of such beams, offering an analysis of prestress losses and their effects on limit states. Moreover, it is intended to serve as instructional material for students and engineers interested in structural engineering, contributing to enhancing knowledge and practices in this area of civil engineering.

2024-04-19T00:00:00Z https://repositorio.ufu.br/handle/123456789/50000 2026-09-03T06:28:30Z 2026-02-06T00:00:00Z

Title: Análise da influência do teor e do comprimento de fibras de carbono e do consumo de cimento nas propriedades de concretos de ultra-alto desempenho Abstract: Ultra-high-performance concrete (UHPC) is characterized by high mechanical strength, low porosity, and enhanced durability. However, in the absence of fibers, it exhibits a brittle response under loading, making the incorporation of fibrous reinforcement necessary to improve ductility and energy absorption capacity. Thus, this study evaluated the interaction between carbon fibers and the UHPC matrix, as well as their influence on the mechanical properties, toughness, and electrical properties of the composite, considering a constant water-to-binder ratio of 0.23 for all mixtures. The research comprised the physical and chemical characterization of the constituent materials, followed by the definition of a central composite rotatable design for statistical experimental planning. Subsequently, the packing density of fine materials was optimized using the modified Andreassen and Andersen particle packing model. The optimized mixtures were produced and evaluated in both fresh and hardened states. The composite properties were investigated at different curing ages, according to the requirements of each test. At 28 days, compressive strength, flexural tensile strength, total porosity by absorption, and electrical resistivity were evaluated. At 56 days, compressive strength, flexural tensile strength, electrical resistivity, and modulus of elasticity were determined. The results of the experimental design enabled the development of response surfaces and the identification of statistically significant variables, highlighting cement content as the main governing factor for the mechanical properties within the studied domain. The results demonstrate that it is possible to produce ultra-high-performance concrete with low cement consumption (500 and 550 kg/m³), contributing to the advancement of knowledge on UHPC mixture design. Complementary mixtures with higher carbon fiber content indicated that increasing the fiber content significantly improves the tensile strength and toughness of the composite. The mixture containing 3.7% carbon fibers exhibited outstanding overall performance, combining high mechanical strength with enhanced energy absorption capacity, demonstrating the potential of carbon fibers to produce UHPC with improved mechanical properties.

2026-02-06T00:00:00Z