Shear Deformation and Sliding-Based Fiber Beam-Column Model for Seismic Analysis of Reinforced Concrete Coupling Beams
Publication: Journal of Structural Engineering
Volume 142, Issue 7
Abstract
Conventional RC coupling beams have been widely used as key energy-dissipation components in frame-core tube structural systems for high-rise buildings. A model with sufficient efficiency, accuracy, and practicality is urgently needed for the seismic analysis of high-rise structures. According to test results, both the shear deformation and shear sliding mechanisms are critical to assessing the seismic performance of coupling beams. However, available shear models for beams and columns cannot give satisfactory results in modeling both mechanisms in finite-element analysis (FEA). To address this problem, this study takes into account the section shear force–shear strain and shear sliding laws in the traditional displacement-based fiber beam-column element, which is implemented into a general FEA package. A new section shear force–shear strain law, which can consider the pinching effect, strength and stiffness deterioration, shear capacity degradation, and arbitrary complex loading path is first proposed. In addition, a new section shear force–shear sliding strain law is developed to model the special shear sliding phenomenon. Then, shear sliding and shear compression limit formulas are given to determine different failure modes. Two beam-column elements, named the shear element and sliding element, are finally developed and combined to model the coupling beam. To verify the proposed model, 47 test specimens are collected and summarized. The formulas for the shear strength, cracked shear stiffness, and shear displacement limit are proposed and verified. Then, the model is applied to 16 test specimens. It is indicated that the model has sufficient accuracy, high efficiency, and convenient modeling procedure, which offers a reliable and powerful tool for seismic analysis of conventional RC coupling beams and high-rise structures.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the Twelfth Five-Year Plan major projects supported by National Science and Technology (Grant No. 2011BAJ09B01), and the National Science Fund of China (Grant No. 51378291).
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Published In
Journal of Structural Engineering
Volume 142 • Issue 7 • July 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Dec 15, 2014
Accepted: Nov 24, 2015
Published online: Feb 9, 2016
Published in print: Jul 1, 2016
Discussion open until: Jul 9, 2016
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