Navegando por Autor "SANTANA, Wylliam Bessa"

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Acesso aberto (Open Access)
Construction delays: a case study in the Brazilian Amazon
(Universidade Federal do Pará, 2017-09) MAUÉS, Luiz Mauricio Furtado; SANTANA, Wylliam Bessa; SANTOS, Paulo Cerqueira dos; NEVES, Renato Martins das; DUARTE, André Augusto Azevedo Montenegro
The construction industry is one of the industrial sectors with the lowest rates of fulfilment of contract deadlines, especially in developing countries. This fact has been the focus of considerable discussions seeking to identify the causes of the delays. The main purpose of this paper is to use factor analysis to identify the factors that are correlated with delay, contemplating exclusively residential real estate projects and using a city in the Brazilian Amazon as a case study. Based on the database from the government agency that authorises constructions in the city of Belém (City Planning Department - Secretaria Municipal de Urbanismo, SEURB) and data from construction companies, the study investigated 274 construction projects from the past 11 years. Factor analysis and work with the variables that can be identified and measured in the initial phase of the project, i.e., during the feasibility study, demonstrate that the physical characteristics of the apartments and the construction project are the primary causes for variations in construction delays; these causes have not yet been reported in the literature. We hope that the results of this study will contribute to more consistent forecasting of construction time, minimising the risk of delays.
Acesso aberto (Open Access)
Desempenho acústico das edificações segundo a NBR 15575 (ABNT, 2013): desempenho das vedações e validação dos requisitos normativos com base na opinião dos usuários
(Universidade Federal do Pará, 2016-03-18) SANTANA, Wylliam Bessa; PICANÇO, Marcelo de Souza; http://lattes.cnpq.br/4535052395600357
With the growth of large urban centers in Brazil, the population density and the need for housing led to high demand for semi-detached homes and apartment houses with numerous apartments, however, with the passage of time they became the result of user complaints in consequence of the low performance of the buildings. The normalization of the performance of the buildings was necessary. Several international standards address the issue, but only in 2013 was published the Brazilian standard of buildings performance NBR 15575 (ABNT, 2013), stipulating among other things, requirements for acoustic performance of internal and external walls, and slabs about the noise impact and air. However, there are some questions, such as: does the current construction typology meet these performance acoustic criteria? Are these criteria suitable? Among to answer these questions, field tests and questionnaires were performed with residents. Among the seals whose acoustic performance is required, the results show the inner walls are more distant to meet these criteria, and the external meet with difficulty, even as perceived by users. About the regulatory requirements for acoustic performance, are significant the annoyed levels generated by impact loads on slabs, highlighting the low accuracy, and even more worrying that the latter is the fact in not require acoustic performance criteria regarding the impact noise between walls, highlighted by the vast majority of respondents as the main source of noise.