Browsing by Author "Oliveira, Rosário"
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- Application of digital technologies in the assempbly control of steel structuresPublication . Oliveira, Rosário; Ribeiro, Diogo; Oliveira, Pedro; Gavina, RuiIn the industrialization of the construction of metallic structures, quality control procedures are required, both for manufacture and assembly. The structural control and validation in the construction phase aims to identify the geometric deviations that may occur during its assembly, as well as to ensure the compliance with all requirements and tolerances essential to the operation of the structure. In this context, the application of digital technologies emerges as a resource to support stakeholders in the construction process, since these quality control procedures, although essential, are characterized as being time-consuming, difficult to document and prone to error. After the study of the technologies associated with automation and geometric verifications of the objects, the methodology followed was the analysis of a case study, by comparison of the structural models of manufacture and assembly. A steel structure was analyzed, using computational tools and digital survey technologies. The results obtained allowed to conclude that the use of digital technologies contributes positively to the automation of control procedures and geometric validation of metallic structures, both in the manufacturing and assembly phases.
- Mortar with pet—Preliminary resultsPublication . Oliveira, Rosário; Garcia, Maria da Luz; Meira Castro, Ana C.; Silva, Teresa NetoThe objective of this work is to evaluate the performance and feasibility of the use of coating mortars with the incorporation of ground polyethylene terephthalate (PET) waste. It was studied the performance of 1: 4 mortars in weight with partial replacement of the aggregate by PET residuals in different percentages (0%, 5% and 10%). Obtained results showed a decrease of the mechanical resistance of mortars in the inverse proportion of the use of PET residues of the mixture, an increase in resistance to water absorption by capillary action and a decrease in thermal conductivity. These results support the potential use of PET waste in coating mortars, thereby contributing to reduce the environmental impact caused by plastic waste. However, in order to be considered energy efficient, this new material needs further improvements.
- Real Estate Appraisal Using Matricial ApproachPublication . Oliveira, Rosário; Camposinhos, RuiIn this paper a new approach is presented to establish unit sale values for residential properties constituted as horizontal property units, common said freehold apartments or flats, considering a real estate investment and its Estimated Market Value (EMV). The economic and financial parameters associated to a certain real estate investment being known, such as design and construction costs, expected sale’s values and marketing fees, an associated profitability can/may be determined. For a presumed profitability on a given real estate investment of freehold flats, the matrix analysis allows to ascertain the overall EVM (i.e., the amount of income) according to the units typologies, constituting the whole investment, or assigning a marketing target per square meter unit value. A study case is presented in the article considering the referred matrix approach analyzing a real estate investment consisting of different flat types (in horizontal property) to ascertain unit sale values and, at the same time, granting the overall EMV and consequently its profitability. Considering the study case and the methodology followed by the inversion and matrix multiplication of precisely defined independent terms, one can state that the application of a matrix approach in the analysis of real estate investment is a fast and easy tool to monitor the variability of different parameters related to market investment allowing to fix unit values (per square meter) of flats based on a target profitability value for the investment.