DSpace Community:https://repositorio.ufu.br/handle/123456789/51442026-08-04T23:46:53Z2026-08-04T23:46:53ZManifestações patológicas em estruturas de concreto protendidohttps://repositorio.ufu.br/handle/123456789/492922026-08-04T19:13:56Z2026-03-23T00:00:00ZTitle: Manifestações patológicas em estruturas de concreto protendido
Abstract: The present study addresses pathological manifestations in prestressed concrete structures, highlighting their technical relevance in view of the increasing use of this structural system in medium- and large-scale projects. Prestressed concrete is widely employed because it allows for reduced cross-sections, increased spans, and improved control of cracking. However, it presents high sensitivity to design, construction, and maintenance failures, particularly with regard to the integrity of prestressing tendons. The objective of this study is to analyze the main types of pathologies affecting prestressed structures, as well as the methods for their identification and the associated repair and maintenance strategies, aiming to contribute to the safety, durability, and performance of these structures. The adopted method is based on a bibliographic review of Brazilian technical standards, especially ABNT NBR 6118:2023 and ABNT NBR 14931:2023, in addition to scientific articles, dissertations, and recent case studies related to the subject. The main pathological mechanisms are discussed, such as sudden tendon rupture, loss of prestress, cracking, excessive displacements, and water infiltration, emphasizing their causes, consequences, and interrelationships. In addition, the study presents the main methods for identifying pathologies, highlighting non-destructive testing techniques such as ultrasonic testing, rebound hammer testing, electrical resistivity, thermography, and the RIMT test, demonstrating their importance in the early diagnosis of internal damage. As a result, it is observed that most pathologies in prestressed concrete structures are associated with deficiencies in technological control, exposure to aggressive environments, and the lack of systematic preventive maintenance. It is concluded that the adoption of integrated strategies for inspection, diagnosis, repair, and maintenance, combined with strict compliance with technical standards and the involvement of qualified professionals, is essential to extend the service life of prestressed structures and ensure adequate levels of structural safety over time. Keywords: prestressed concrete; pathological manifestations; non-destructive testing; structural durability; structural maintenance.2026-03-23T00:00:00ZEngenharia diagnóstica: estudo dos mecanismos de degradação e a intervenção terapêutica em elementos de concreto armado - estudo de caso em obra de arte especialhttps://repositorio.ufu.br/handle/123456789/492892026-08-04T19:06:22Z2026-03-10T00:00:00ZTitle: Engenharia diagnóstica: estudo dos mecanismos de degradação e a intervenção terapêutica em elementos de concreto armado - estudo de caso em obra de arte especial2026-03-10T00:00:00ZComportamento estrutural de vigas celulares mistas de aço e concreto com protensão externahttps://repositorio.ufu.br/handle/123456789/492382026-08-03T17:38:17Z2026-03-12T00:00:00ZTitle: Comportamento estrutural de vigas celulares mistas de aço e concreto com protensão externa
Abstract: Cellular composite steel–concrete beams are defined as the combination of a concrete slab and
a steel beam with sequential circular openings, connected through shear connectors, enabling
their application in long spans while reducing self-weight. In order to improve structural
performance or support rehabilitation strategies, external prestressing emerges as a viable
solution to increase load-carrying capacity and reduce serviceability deflections. However,
although prestressing is well established in reinforced concrete, and standards such as ABNT
NBR 8800:2024 and Eurocode 4 BS EN 1994-1:2026 address the design of composite beams,
while Eurocode 3 BS EN 1993-1-13:2024 covers cellular beams, there are still no normative
procedures for the application of external prestressing in cellular composite steel–concrete
members. In this context, a numerical model was developed using ABAQUS® to investigate
the structural behavior of externally prestressed cellular composite beams, based on validation
against experimental models available in the literature. A parametric study was carried out to
evaluate the influence of cable eccentricity, initial prestressing force, cable profile and span, as
well as cross-sectional properties and geometric parameters of the openings. The analysis
focused on the serviceability limit state defined by ABNT NBR 8800:2024, adopting a
displacement-based criterion corresponding to a maximum deflection of L/350. The results
indicated that external prestressing increased the equivalent bending moment under service
conditions in all analyzed models, with gains ranging from approximately 20% to 45%
compared to non-prestressed beams, depending on the cable profile and eccentricity. Polygonal
cable layouts showed superior performance compared to straight profiles, promoting a more
efficient redistribution of internal forces. It was also observed that variations in opening
diameter influence the elastic behavior of the beams. Overall, external prestressing proved to
be an effective strategy to enhance the service performance of cellular composite beams,
contributing both to increased load capacity and reduced deflections, particularly when efficient
cable layouts are adopted.
parameters.2026-03-12T00:00:00ZAvaliação mercadológica do Campus Educação Física – UFU pelo método evolutivo: estudo de casohttps://repositorio.ufu.br/handle/123456789/492282026-08-01T06:29:04Z2026-05-18T00:00:00ZTitle: Avaliação mercadológica do Campus Educação Física – UFU pelo método evolutivo: estudo de caso
Abstract: Appraisal engineering is the technical field responsible for identifying, in an objective and well-founded manner, the value of assets and rights, especially real estate, based on recognized methods and verifiable data. In the real estate market, its application is essential for reducing uncertainty and supporting negotiations, financing, guarantees, insurance, leases, and feasibility studies. For public and private institutions, appraisal also plays a relevant role by supporting asset management, guiding investments, substantiating acquisition and disposal processes, and meeting demands related to control, planning, and transparency, thus making decisions more consistent and technically justifiable before the various stakeholders involved.
Within this context, the present study aims at the market appraisal of the Physical Education Campus, adopting the Evolutionary Method as the procedure for composing the property value. To determine the land value, the Direct Sales Comparison Approach is employed, with emphasis on data collection, selection, and treatment, as well as on data homogenization and the use of software for statistical analysis and validation of results. At the same time, the valuation of the improvements is carried out through the Cost Quantification Method, based on the built area, technical references such as the CUB, and the consideration of depreciation compatible with the apparent age and state of conservation. Finally, the integration of land value and improvement value allows the determination of the total property value, enabling a discussion of the reliability of the data used, the limitations of the study, and compliance with the applicable technical standards.2026-05-18T00:00:00Z