Banca de DEFESA: Aparecida Evangelista Cartaxo

PUNCHING IN REINFORCED CONCRETE FLAT SLABS SUPPORTED ON REENTRANT CORNER COLUMN

PUNCHING IN FLAT SLABS OF REINFORCED CONCRETE SUPPORTED ON CORNER PILLARS REENTRANT.

Although most research on punching shear is related to internal columns, the study of the behavior of the 

slab-column connection with a re-entrant corner is essential due to the frequent use of this connection in 

buildings. Therefore, the present work aims to experimentally analyze the punching behavior of reinforced 

concrete flat slabs supported on re-entrant corner columns, with the main study variable the shear reinforcement 

rate. The experimental program consists of three slabs supported on columns with a square section of 300x300 mm. 

One of the slabs did not have shear reinforcement, while the others were reinforced with different rates of double 

headed studs, positioned radially in relation to the column. All slabs had the same flexural reinforcement ratio (0.96%)

 and were subjected to the same load eccentricity. With the analysis of the experimental results, it was observed that 

the monitored studs presented good performance, especially in the first and second layer of distribution. 

The use of shear reinforcement provides an increase in resistance at levels between 14% and 21%. 

A database was assembled with the results of this research and Albuquerque (2015). 

The results were evaluated in accordance with the prescriptions of ABNT NBR 6118 (2014), ABNT NBR 6118 (2023),

Eurocode 2 (2004), prEC2 (2022), ACI 318 (2019) and fib Model Code 2010 (2013).