Experimental Behavior of Nonconforming RC Columns with Plain Bars under Constant Axial Load and Biaxial Bending
Publication: Journal of Structural Engineering
Volume 139, Issue 6
Abstract
Available capacity models for the assessment of seismic capacity of RC columns are mainly based on experimental tests under axial load and uniaxial bending. Furthermore, experimental tests have been mainly performed on columns representative of new constructions. To analyze the effects of biaxial bending on the seismic performances of existing RC columns with design characteristics nonconforming to present day seismic codes and practices, this paper presents the results of a first stage of tests on RC columns under both axial load and biaxial bending, which effectively simulate the seismic actions. In particular, this paper presents results of four tests on full-scale square columns reinforced with plain bars subjected to constant axial load and biaxial cyclic actions. Two different cyclic displacement paths were investigated: horizontal displacements with an inclination angle of 45 or 30°, with respect to the cross-section principal axes. The influence of biaxial bending actions on the global behavior of existing RC columns in terms of stiffness, strength, deformation capacity, and the effects of different horizontal displacements orientation on their performances are herein investigated and discussed; the comparison with experimental outcomes provided by uniaxial bending tests on companion specimens are also presented. Experimental findings showed that biaxial bending actions affect columns rotational capacity more than strength. The rotational capacity reduction because of biaxial bending actions, even if more significant than the flexural capacity reduction, is not currently taken into account in the available seismic guidelines related to existing RC buildings.
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Acknowledgments
The experimental work was developed within the activities of the research work of the Laboratories University Network of Seismic Engineering (ReLUIS), funded by the Italian Department of Civil Protection (Executive Project No. 2010-2013).
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Published In
Journal of Structural Engineering
Volume 139 • Issue 6 • June 2013
Pages: 897 - 914
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 27, 2012
Accepted: Aug 2, 2012
Published online: Aug 13, 2012
Published in print: Jun 1, 2013
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