Faculdade de Engenharia Civil - FEC/ITEC
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2788
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Navegando Faculdade de Engenharia Civil - FEC/ITEC por Autor "LIMA NETO, Aarão Ferreira"
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Item Acesso aberto (Open Access) Influence of the column rectangularity index and of the boundary conditions in the punching resistance of slab-column connections(Universidade Federal do Pará, 2015-06) PAIVA, Odilson da Silva de; FERREIRA, Maurício de Pina; OLIVEIRA, Dênio Ramam Carvalho de; LIMA NETO, Aarão Ferreira; TEIXEIRA, Marcelo RassyExperimental evidence indicates that both the column rectangularity index and the boundary conditions of the connection may affect the ultimate punching resistance. This paper presents general aspects of these topics and, through the analysis of experimental results of tests on 131 slabs, evaluates the accuracy and suitability of recommendations presented by ABNT NBR 6118, Eurocode 2, ACI 318 and fib Model Code 2010. Experimental results showed that the security level of normative estimates trend to reduce as the column rectangularity increases, and in some cases, the punching resistance was overestimated. Finally, adjustments are suggested in equations presented by NBR 6118 and MC2010 in order to eliminate this trend of unsafe results.Item Acesso aberto (Open Access) Punching shear resistance of reinforced concrete footings: evaluation of design codes(Universidade Federal do Pará, 2018-04) SANTOS, Douglas Freitas Augusto dos; LIMA NETO, Aarão Ferreira; FERREIRA, Maurício de PinaPunching is a possible failure mode for slender footings and it may lead a structure to ruin through progressive collapse. Although footing present different geometric characteristics, their punching shear design is based on the empirical methods used for flat slabs. This paper uses experimental results from 216 tests to evaluate the performance of design code recommendations presented by ACI 318 (2014), ABNT NBR 6118 (2014) and Eurocode 2 (2010) to estimate the punching shear resistance of reinforced concrete footings. Great dispersion between theoretical and experimental results was observed, being evident that the test system affects the punching shear capacity of footings. The more complex method proposed by Eurocode 2 resulted in a better correlation with experimental results.