Research on Cracking of Reinforced Concrete Beam and Its Influence on Natural Frequency by Expanded Distinct Element Method
Publication: Journal of Aerospace Engineering
Volume 30, Issue 2
Abstract
A distinct element model was proposed to simulate cracking in a reinforced concrete beam, and the influence of cracking on natural frequency was analyzed. Hexagonal block and tensile-shear failure criteria were implanted into the framework of the expanded distinct element method to determine two-dimensional cracking and to analyze the crack growth of the reinforced-concrete beam. Experimental tests were also carried out to verify the numerical simulation results. Numerical and experimental results show that at the cracking initiation stage, cracks appear below the loading points because of concentrated tensile stresses and grow upward. When these cracks penetrate three-quarters of the beam, cracks open in the bottom and gradually curve toward the loading points. Cracks caused by shear failure occur in the top of the beam. The beam fails because of a yielding of the longitudinal tensile reinforcement bar. Cracking and yielding of longitudinal tensile reinforcement can be identified based on a continuously descending natural frequency.
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Acknowledgments
This work was supported partly by the Foundation of Education Department (QN2016080) in Hebei Province, National Natural Science Foundation of China (51608336), and the Collaborative Innovation Center for Disaster Prevention and Mitigation of Large Basic Infrastructure in Hebei Provence. The authors would like to thank Assistant Professor Bo Li from the Graduate School of Engineering of Nagasaki University in Japan and Lecturer Lei Yang from the Department of Civil Engineering in Shandong University in China for their kind support and advice on this research.
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Published In
Journal of Aerospace Engineering
Volume 30 • Issue 2 • March 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 28, 2015
Accepted: Aug 31, 2016
Published online: Nov 21, 2016
Published in print: Mar 1, 2017
Discussion open until: Apr 21, 2017
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