Experimental Testing of Reinforced ECC Beams Subjected to Various Cyclic Deformation Histories
Publication: Journal of Structural Engineering
Volume 144, Issue 6
Abstract
Steel-reinforced engineered cementitious composite (ECC) members have demonstrated enhanced seismic performance in structural components and systems such as coupling beams, infill panels, joints, columns, and beams. Because a large pulse in a deformation history may cause fiber pullout within the ECC and alter material-level behavior, the response of reinforced ECC components subjected to deformation histories that contain initial pulses are of particular interest. Reinforced ECC beams of various steel reinforcement ratios and reinforcing bar sizes were experimentally subjected to one of three deformation histories. The presence and size of initial deformation pulses affected cracking, strain development in the steel reinforcement, and hysteretic response, while the failure mode of the specimens was consistently fracture of the steel reinforcing bars. Reductions in steel reinforcement strain caused by bond degradation at the steel–ECC interface facilitated, in general, no change in ultimate structural ductility between similar specimens, regardless of deformation history, except specimens containing the lowest steel reinforcement ratio, 0.73% in flexure, which had a comparatively high bond capacity relative to the bond demand at the steel–ECC interface.
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Acknowledgments
The authors would like to acknowledge financial support provided by the Air Force Institute of Technology, the John A. Blume Earthquake Engineering Center, and the Thomas V. Jones Engineering Faculty Scholarship at Stanford University. The views expressed in this paper are those of the authors and do not reflect the official policy or position of the United States Air Force, Department of Defense, or the U.S. Government.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 144 • Issue 6 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jul 8, 2017
Accepted: Nov 7, 2017
Published online: Mar 30, 2018
Published in print: Jun 1, 2018
Discussion open until: Aug 30, 2018
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