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Concrete filled steel columns : a study of combined bending and compression and beam-column connections

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Author(s):
Silvana De Nardin
Total Authors: 1
Document type: Doctoral Thesis
Press: São Carlos.
Institution: Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD)
Defense date:
Examining board members:
Ana Lucia Homce de Cresce El Debs; Jose Samuel Giongo; Maximiliano Malite; Gílson Queiroz; Jose Luiz Antunes de Oliveira e Sousa
Advisor: Ana Lucia Homce de Cresce El Debs
Abstract

This research thesis presents a study of concrete filled steel columns subjected to combined bending and compression and beam-column connections. In both cases, tests were conducted on physical and numerical models, resulting in the development of a wide range of parametric studies for the case of the concrete filled steel columns. 13 concrete filled steel columns were tested under combined bending and compression loads whose ultimate values were compared to ultimate forces obtained from numerical simulations using the CFT computer program. After calibration, the computer program was used in the parametric study with the aim of verifying the influence of parameters, such as the material strength, eccentricity of the axial force, bending axis and breadth/thickness relation, on the ultimate load carrying capacity of the concrete filled steel columns. With respect to the beam-column connections, four types of connections were tested, two of them composed of endplate and bolts, while the other two were welded, with one of them stiffened by an angle steel placed inside the steel tube. The obtained results are discussed, giving more emphasis to the bending moment-rotation behaviour of the tested specimens. The beam-column connections were also investigated numerically. The obtained results permit the laying out of important directives for the improvement of such numerical simulation tools as the one employed in the present thesis. Lastly, pertinent conclusions relative to this thesis and recommendations for future research are presented (AU)