Análise de custo da aplicação de reforço misto com fibra de carbono e estruturas metálicas em estruturas de concreto armado

Abstract

This study presents an economic analysis of the application of mixed structural reinforcement, consisting of carbon fiber fabric and metallic structures, in reinforced concrete elements. The research was based on a real case study involving the execution of reinforcement in beams and slabs on a commercial building floor. The services were identified and quantified according to the executive design and technical reports of the project, enabling cost estimation using SINAPI, ORSE, and other databases. The detailed budget allowed for the calculation of unit and total costs, the development of an ABC Curve to assess the representativeness of inputs, and the determination of a general cost index of BRL 469.66/m², as well as specific consumption indices for each structural material. The results showed that only five inputs accounted for approximately 76.5% of the total cost, with the carbon fiber fabric being the most expensive item, representing 34.5% of the budget. The fiber reinforcement exhibited an average consumption of 0.80 m² of fabric per m² reinforced (2.30 m² per m³), while the metallic reinforcement required 23.61 kg of steel per m² (67.44 kg per m³). Although their cost structures differ, with carbon fiber fabric requiring greater investment in materials and steel demanding greater attention to assembly and anticorrosive protection, both solutions demonstrated satisfactory structural performance. The analysis indicated that the mixed technique can optimize structural performance and durability, reducing the need for future maintenance and enabling more assertive decision-making based on cost–benefit analysis. The obtained indices provide valuable parameters for preliminary estimates and the planning of similar projects, contributing to greater budget accuracy and more efficient resource management.