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      Influence of the column rectangularity index and of the boundary conditions in the punching resistance of slab-column connections Translated title: Influência do índice de retangularidade dos pilares e das condições de contorno na resistência à punção de ligações laje-pilar

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          Abstract

          Experimental 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.

          Translated abstract

          Evidências experimentais indicam que tanto o índice de retangularidade dos pilares quanto as condições de contorno da ligação podem afetar a resistência última à punção. Este artigo apresenta aspectos gerais sobre estas situações e, através da análise de resultados experimentais de ensaios em 131 lajes, avalia a precisão e a adequabilidade das recomendações apresentadas pelas normas ABNT NBR 6118, Eurocode 2, ACI 318 e fib Model Code 2010. Os resultados experimentais mostraram uma tendência de redução do nível de segurança das estimativas normativas, à medida que o índice de retangularidade aumenta, chegando-se em alguns casos a superestimar a resistência à punção. Por fim, são sugeridas adaptações nas equações da norma brasileira e do MC2010 buscando eliminar esta tendência de resultados inseguros.

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          Most cited references45

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          CEB-FIP MODEL CODE 1990

          (1993)
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            • Abstract: not found
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            Punching Shear Strength of Reinforced Concrete Slabs without Transverse Reinforcement

            (2008)
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              • Record: found
              • Abstract: not found
              • Article: not found

              NBR 6118: projeto de estruturas de concreto

              (2004)
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                riem
                Revista IBRACON de Estruturas e Materiais
                Rev. IBRACON Estrut. Mater.
                IBRACON - Instituto Brasileiro do Concreto (São Paulo )
                1983-4195
                June 2015
                : 8
                : 3
                : 260-295
                Affiliations
                [1 ] Universidade Federal do Pará Brazil
                [2 ] Universidade Federal do Pará Brazil
                Article
                S1983-41952015000300260
                10.1590/S1983-41952015000300003
                8b1574e0-b0a2-4b14-ada7-1055dcc56ba7

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1983-4195&lng=en
                Categories
                ENGINEERING, CIVIL

                Civil engineering
                lajes lisas,punção,pilar retangular,concreto armado,normas,reinforced concrete,codes,flat slab,punching shear,rectangular column

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