CAMTUC - Campus Universitário de Tucuruí
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/8104
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Item Acesso aberto (Open Access) Análise experimental e numérica de lajes cogumelo de concreto armado(Universidade Federal do Pará, 2013-04) LIMA NETO, Aarão Ferreira; FERREIRA, Maurício de Pina; OLIVEIRA, Dênio Ramam Carvalho de; MELO, Guilherme Sales Soares de AzevedoThe use of column capitals is one way to increase the punching strength of slab-column connections. Recommendations presented by codes of practice for defining the geometry and checking the resistance of slab-column connections with capitals are not comprehensive, with few experimental studies available on the topic. This paper discusses important aspects of the historical development of mushroom slabs and also presents experimental results of 4 tests, with 1 test in a reference flat slab and 3 tests in mushroom slabs with circular column capitals. These results are compared with theoretical results estimated using Eurocode 2 (2004) and NBR 6118 (2007). They were also compared with a series of non-linear finite element analysis in order to get insight of the stress distribution and of the failure mechanism of mushroom slabs.Item Acesso aberto (Open Access) Influence of the supplementary reinforcement on the shear strength of beams with prefabricated truss stirrups(Instituto Brasileiro do Concreto, 2022) PINTO, Rosângela Silva; SOUSA, Vanessa Carolaine de; TAPAJÓS, Luamim Sales; FERREIRA, Maurício de Pina; LIMA NETO, Aarão FerreiraThis paper presents the results of seven experimental tests in reinforced concrete wide beams, aiming to investigate their performance when subjected to shear, using prefabricated truss stirrups as shear reinforcement, as well as a supplementary reinforcement to control cracks by delamination. The main analysed variables were: position of the supplementary reinforcement, inclination of the shear reinforcement, and spacing between stirrups. Results showed that strength increments of up to 142% were obtained using the prefabricated truss stirrups. Furthermore, the experimental results were compared with the theoretical shear strength estimates of the tested beams, following the recommendations of NBR 6118 (2014), Eurocode 2 (2004), and ACI 318 (2014), in order to evaluate the safety level of these codes when designing concrete elements subjected to shear with the reinforcement used in this paper.