Estudo comparativo entre métodos de verificação da resistência de lajes à punção

Abstract

Among the various construction systems, the use of flat slabs and staked slabs, come every day gaining more space in Brazil, due to the simplicity and agility of execution and time savings and economy of wood forms. However, in slabs that support directly on columns, the verification of the punching shear should be performed, being a determining factor for the definition of slab depth, the geometry of the columns and the compressive strength of the concrete. In this work, comparative studies were done to understand the variables influencing the slab-columns connections resistance and how these variables are quantified in two different punching resistance calculation models: the control surface model adopted by Brazilian code NBR 6118 (2014) and the method of critical shear crack theory, proposed by the researcher Aurelio Muttoni.