Conexão de cisalhamento constituída por furos em chapa preenchidos com concreto com barra passante: comportamento em meio confinado

Abstract

In this work, experimental and numerical investigations were conducted, and an analytical model was proposed to describe the behavior of circular openings with transverse bars as steel-concrete shear connectors. The aim was to predict both the strength and slip capacity of these connectors when applied in a confined location of a composite section. This work was conducted because most studies and design models currently available place the connector in a superficial or non-confined location of the composite section, however, it has been shown that the referred connector shows considerable increase in strength and slip capacity when in confined situations, because, while in superficial situations the connector tends to show brittle behavior and fail by concrete spalling, in confined situation it tends to show ductile behavior and fail by rupture of rebar. Therefore, to improve usage of these connectors in confined situations, an in-depth study of its behavior was carried out, describing second order effects in the rebar and the load-slip curve up until failure. The model was tested and calibrated with several experimental results, both from this work and from other authors, proving to be valid and having a wide range of applicability and showing strong correlation with experimental data.