Name: Ana Carolina Scampini Siqueira Rangel Orrico
Type: MSc dissertation
Publication date: 09/08/2018

Namesort descending Role
Macksuel Soares de Azevedo Advisor *

Examining board:

Namesort descending Role
Jorge Munaiar Neto External Examiner *
Macksuel Soares de Azevedo Advisor *
Walnório Graça Ferreira Internal Examiner *

Summary: The use of external diaphragms in connections between I-beams and circular hollow
section columns aims to improve efficiency of the transmission of forces and moments
between these two elements. The study of diaphragms began in Japan in the 1970s,
WHERE theoretical work and experimental analysis of its application were made. In
Brazil research dates to 2005, when Carvalho (2005) performed the first numerical
analyzes of a connection both with and without the diaphragm. The Brazilian standard
ANBT NBR 16239:2013 does not address the design of this type of connection, which
is contemplated only by Kurobane (2004) in the Comité Internacional pour Le
Développement et l’Etude de La Construction Tubulaire (CIDECT). The objective of
this study is to analyze the behavior of external diaphragms in the connections between
I-beams and circular hollow section columns. Numerical analysis was performed
exploring a range of geometries for the external diaphragm and evaluating the
effectiveness of the connection when both the beam and the column are loaded. The
diaphragm proved to be an effective mechanism to increase the initial stiffness and the
ultimate strength of the connection providing resistance gains ranging from 30 to
173%, depending on the geometry of the parts. When the column is submitted to axial
loading, the model without diaphragm the value of the ultimate bending moment
resistance presents a gradual reduction between 3.2% (for the smallest diaphragm)
and 17%.

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