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Navegando EECA - Artigos publicados em periódicos por Autor "Araújo, Daniel Lima"
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Item Análise do conforto ambiental em salas de aula: comparação entre dados técnicos e a percepção do usuário(2012-03) Ochoa, Juliana Herlemann; Araújo, Daniel Lima; Sattler, Miguel AloysioThis paper deals with the on-site evaluation of indoor environmental comfort in classrooms of two buildings at the Federal University of Goiás, characterized by different architecture and construction techniques. This study aims to analyze these buildings in order to identify the influence of the construction techniques and physical conformation on environmental performance. The technical data were collected and analyzed according to the type of comfort. The measurements concerning visual comfort were undertaken around the time of the annual solstices and equinoxes. Indoor microclimatic data, i.e. air temperature and relative humidity, were collected over eleven months. A simplified soundscape characterization was performed with the aid of sound pressure levels, which were collected over a whole day, in the midst of daily activities. It was observed that although the buildings have similar solar orientation, the visual and thermal comfort in these buildings were quite different. In addition to the technical evaluations, questionnaires were also applied to the occupants of the classrooms in order to get their perception for each type of comfort. The comparison of the technical data and the occupants’ perception shows that the opinions of the occupants were not consistent with the technical results. A discrepancy was identified between the proposal of comfort zones adopted and the occupants’ comfort perception in those buildings.Item Avaliação da resistência e do módulo de elasticidade de concretos convencionais autoadensáveis submetidos a altas temperaturas(Universidade de Federal de Goiás, 2021-12-02) Siqueira, Bárbara Gomes de; Leonel, Antônio Carlos Assis; Lima, Vitor Augusto Lopes de; Araújo, Daniel LimaIn Brazil, about 90% of the structures of constructions are made of concrete. This great volume of concrete structures was not accompanied by the increase on researches about specific topics, such as concrete structures on fire condition. In Brazil, this subject is regulated by standards NBR 14432: 2001 and NBR 15200: 2012, which are based on the international regulations Eurocode 1, Eurocode 2 and ISO 834. However, the International standards have design recommendations that have not been incorporated into Brazilian standards. Thus, the study of local concretes in order to complement national standards with new design parameters is relevant. The main objective of this paper is to evaluate the influence of the high temperature on compressive and tensile strength and on the modulus of elasticity of two medium strength concretes, one conventional and one self-consolidating. For this, tests for compressive and tensile strength, as well as modulus of elasticity, were performed on cylindrical concrete specimens after being submitted to temperatures of 200, 400 and 600°C