Effects of Reinforcement Discontinuity on the Collapse Behavior of Reinforced Concrete Beam-Slab Structures Subjected to Column Removal
Publication: Journal of Structural Engineering
Volume 145, Issue 11
Abstract
Existing reinforced concrete buildings constructed in low-seismic zones are most vulnerable to disproportionate collapse due to low reserve strength and presence of reinforcement discontinuity. This research aims to experimentally observe the collapse behavior of such ordinary structures, particularly the beneficial development of compressive arch and catenary actions, and evaluate the effects of various reinforcement detailing on building collapse resistance. Three -scale beam-slab-column assemblies representing parts of a prototype building structure were monotonically loaded until complete failure through a 12-point loading system simulating uniformly distributed loads. The test units with beam and slab longitudinal reinforcement discontinuity exhibited relatively ductile collapse modes with a beam chord rotation angle of 12%. Catenary action developed well in beam and slab top reinforcement, whereas the mobilization of compressive arch action was insignificant. Providing longitudinal reinforcement continuity could increase both load and deformation capacities of test structures up to 160% and 140%, respectively. The yield-line approach can conservatively predict the collapse load of beam-slab structures and can be used as a simple but reliable check for the potential collapse.
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Acknowledgments
The study presented in this paper was financially supported by National Foundation for Science and Technology Development (NAFOSTED), Vietnam through Grant No. 107.01-2016.07. The financial support is greatly appreciated.
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©2019 American Society of Civil Engineers.
History
Received: May 12, 2018
Accepted: Mar 22, 2019
Published online: Aug 30, 2019
Published in print: Nov 1, 2019
Discussion open until: Jan 30, 2020
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