Implicit Gradient Delocalization Method for Force-Based Frame Element
Publication: Journal of Structural Engineering
Volume 142, Issue 2
Abstract
In this study, a novel force-based frame element with delocalization is developed to address localization issues induced by material strain softening. A regularization procedure for section deformations is introduced on the basis of the concept of deformation gradient dependency. The internal length scale of the gradient-based regularization model is discussed and related to the plastic hinge length of the structural members. The weak form of the governing equation is derived, and a subscale numerical strategy is utilized within each element to implement the proposed model in the frame element. In addition, an adaptive scheme is developed for the RC members to determine the real-time gradient coefficient. Finally, two numerical examples are utilized and the results show that the proposed model can achieve an objective response for and excellent prediction of the nonlinear behavior of RC members.
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Acknowledgments
Financial support from the National Natural Science Foundation of China (Grant No. 91315301, 51261120374, and 51208374) is greatly appreciated.
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Published In
Journal of Structural Engineering
Volume 142 • Issue 2 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: May 22, 2014
Accepted: Jul 9, 2015
Published online: Aug 20, 2015
Discussion open until: Jan 20, 2016
Published in print: Feb 1, 2016
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