Progressive Collapse Resistance of Precast Concrete Frames with Discontinuous Reinforcement in the Joint
Publication: Journal of Structural Engineering
Volume 143, Issue 9
Abstract
Boundary conditions of precast concrete frames play a crucial role in their progressive collapse resistance under middle column removal scenarios. Interior and exterior frames behave differently as a result of different horizontal restraints on side columns. This paper presents an experimental study on four precast concrete frames with either 90° bend or lap-splice of the bottom reinforcement in the beam-column joint. The resistance of interior and exterior frames were determined quantitatively. Reinforcement detailing in the beam-column joint dominated structural resistance and deformation capacity of interior frames. Side columns of interior frames remained intact under compressive arch action (CAA) and catenary action, in spite of significant horizontal deflections and severe cracking because of initial horizontal compression at the CAA stage and subsequent tension at the catenary action stage. However, one exterior frame exhibited flexural failure of the side column when subject to catenary action, evidenced by concrete crushing in the compression zone. In side beam-column joints, diagonal shear cracks were observed at the CAA stage, and shear links were mobilized to sustain the shear force. Finally, relevant conclusions on the progressive collapse design of precast concrete frames are drawn from the experimental findings.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (No. 51608068), Fundamental and Frontier Research Project of Chongqing (No. cstc2016jcyjA0450), and China Postdoctoral Science Foundation (2016M590863).
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Published In
Journal of Structural Engineering
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Mar 3, 2015
Accepted: Feb 22, 2017
Published online: May 11, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 11, 2017
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