http://repositorio.ufc.br/handle/riufc/424 Wed, 10 Jun 2026 20:50:52 GMT 2026-06-10T20:50:52Z http://repositorio.ufc.br/handle/riufc/86640 Título: Análise multiescala dos danos por reações expansivas no concreto: estudo de caso na fundação de um edifício Autor(es): Santos, Halana Karine Dias dos Abstract: Concrete structures are subject to deterioration mechanisms capable of compromising their physical integrity and mechanical performance over time. Identifying these mechanisms and assessing the state of deterioration are fundamental for diagnosing and defining intervention strategies in structures in service. Despite advances observed in the international literature, a gap remains in the national context regarding the integrated application of mechanical and microscopic analysis tools, such as the Stiffness Damage Test (SDT) and the Damage Rating Index (DRI), in real structures affected by expansive mechanisms. In this context, this research aimed to evaluate the degree of deterioration of a foundation block of a 21-year-old vertical building, subjected to internal expansive mechanisms, such as alkali-silica reaction (ASR) and delayed ettringite formation (DEF), using a multiscale approach. Mechanical and microstructural tests were performed, including SDT, DRI, and compressive strength, in addition to scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) analyses. The results indicated that the analyzed concrete is in an advanced stage of deterioration associated with internal expansive reactions. The average compressive strength was 33.00 MPa, approximately 29% lower than the estimated strength at 28 days (46.65 MPa) from the technological control at the time of construction, evidencing a significant loss of mechanical performance over time. The integration of macrostructural (SDT: SDI = 0.22 and PDI = 0.18) and microstructural (DRI = 710.23 and SEM-EDS) results revealed intense microcracking in the cement paste, the presence of an alkaline-silicate gel, and evidence of ettringite formation, associated with the combined action of the alkali-silica reaction and delayed ettringite formation. The SDI and DRI values place the concrete in the very high damage range, according to intervals reported in the literature, corroborating the high degree of deterioration observed in situ. It is concluded that the multiscale approach based on the integration between SDT and DRI is effective for evaluating the deterioration of concrete affected by internal expansive mechanisms in service structures, establishing itself as a robust tool for the diagnosis of real structures. Tipo: Dissertação Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/86640 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/86586 Título: Proposição de sistema automatizado de benchmarking de indicadores geométricos para projetos arquitetônicos residenciais multifamiliares baseados em bim Autor(es): Barbosa, Camily Vasconcelos Abstract: The construction industry plays a fundamental role in economic growth, standing out for its capacity to generate employment, drive urban development, and integrate with various productive chains. However, this sector faces significant challenges, such as the need for technological adaptation, increasing regulatory demands, intense competition, and, above all, difficulties related to project performance management and evaluation, given its complexity and fragmentation. In this context, benchmarking emerges as a relevant strategy to promote continuous improvement and competitiveness by enabling structured comparisons between projects based on standardized indicators. Therefore, this study aimed to develop an automated benchmarking system capable of generating and organizing reference values extracted from BIM models, which can be used by companies to compare the performance of their projects against sectoral parameters and assist designers in monitoring indicators during the design process. These values allow companies to compare the performance of their projects with industry benchmarks and enable designers to monitor indicators throughout the design phase. The research adopted the Design Science Research (DSR) methodological approach, involving the creation of an artifact composed of automated routines for extracting geometric performance indicators. The indicators were defined based on the literature and a technical document from Inovacon. The tool was developed by integrating Revit software with visual programming, enabling automatic data extraction and export of results to Excel spreadsheets. The system was validated through application in twenty multifamily residential projects in the state of Ceará, initially received in DWG format and later modeled in BIM. The extracted indicators enabled the organization of a database that supports benchmarking between projects according to classification ranges. As a result, an automated tool was obtained, capable of reducing analysis time and standardizing indicator calculations, applicable at different project stages: feasibility, development, and completion, continuously feeding the database. From a practical perspective, the study contributes by providing a system that supports companies and designers in project comparison and monitoring. From a theoretical perspective, it advances the integration between benchmarking, geometric indicators, and BIM automation. It is concluded that the application of automated benchmarking supported by BIM tools represents a relevant advancement in project management, promoting greater efficiency, technical grounding, and continuous improvement in the construction sector. The study’s limitations include the scope restricted to geometric indicators, the database composed solely of projects from a specific region (Ceará), and dependence on the use of Revit and Dynamo tools for executing the routines. Tipo: Dissertação Thu, 01 Jan 2026 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/86586 2026-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/85534 Título: Aplicação de programação linear baseada em geração de colunas ao corte de barras de aço destinadas à construção civil Autor(es): Santos, Éden Malveira dos Abstract: The construction companies need to improve their performance by implementing rationality improvements in their processes and management alternatives that led to operating cost reduction. Related to this, the aim was to study the One-Dimensional Cutting Stock Problem (1D-CSP), due to its application in the Civil Construction Industry with propositions to minimize raw material and labor costs, and waste reduction. The main challenge is to compare a linear programming model based on column generation applied to 1D-CSP in steel bars production that meets customer demand to the empirical method used by a company specialized in cutting and bending steel located in the city of Maracanaú/CE. For this purpose, a five-step research strategy was outlined, which was applied in the form of a case study to collect and analyze data from this company. The computational results demonstrated the efficiency of the column generation-based model for obtaining cutting patterns, the computational time required by the solver to return optimal solutions in the projects was 97.45 seconds on average. This represents a considerable gain from a practical point of view, as there is a decrease of more than 45,86% in the effort spent to plan the next cutting patterns to be performed at each requested stop. Regarding the productive capacity, the method predicted an average evolution of 11,03% and 3,98%, for bars with gauges of 12,50mm and 16,00mm, respectively. In monetary terms, annually, minimizing the use of bars in stock brings a reduction of R$ 314.658,46 and the waste reduction reaches the amount of R$ 334.594,39. The results obtained by the implemented model show considerable improvements in the defined objective, as the optimal solutions were found in a low computational time, it is believed that these approaches are promising to be applied in the industries of this segment. It is expected that the studied company analyze the results presented in this thesis as an initiative to restructure the planning methodologies and management stances with a focus on maintaining the competitive standard imposed by the market. Tipo: Dissertação Sat, 01 Jan 2022 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/85534 2022-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/85322 Título: Estabilidade de colunas laminadas de material compósito com seção C Autor(es): Pinto, Marcelo Freires Abstract: The increasing use of composite materials encourages the manufacture of thin-walled elements, due to cost and efficiency. However, these structures are highly slender and susceptible to stability failures when subjected to compressive stresses. Channel profiles have wide applicability as columns and are subject to local and global buckling modes, which makes the structural behavior of these profiles of interest for study. Considering these aspects, this work studies the stability of laminated columns of fiber-reinforced composite material with channel sections subjected to compression. Initially, the Rayleigh-Ritz Method, with one and two degrees of freedom, is used to determine the local buckling load, with these values being compared with results obtained using the Finite Element Method (FEM), in addition to numerical and experimental results available in the literature. Then, the Rayleigh-Ritz Method is also applied to determine the global buckling load, considering the bending-torsion and bending modes around the axis of least inertia. The calculation of cross-sectional equivalent properties of laminated columns is carried out using the theories of Cardoso (1999), Massa and Barbeiro (1998), and Kollar and Pluzsik (2002). The results are compared with those obtained using the Finite Element Method. The proposed approach allows the simple and efficient determination of the signature curve of laminated columns with channel sections subjected to pure compression. This approach is applied to columns with different layups and cross-sectional dimensions, including a parametric study to evaluate the effect of adding layers, consequently increasing the laminate thickness, in addition to different geometric configurations considering the same material consumption. Tipo: Dissertação Mon, 01 Jan 2024 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/85322 2024-01-01T00:00:00Z