General Confinement Model Based on Nonlocal Information
Publication: Journal of Engineering Mechanics
Volume 140, Issue 6
Abstract
The confinement effect has been of significant importance for improving the resilience against extreme compression loadings such as seismic excitations. Notwithstanding the accuracy of previous confinement models, some challenges remain regarding their applicability. The previous approaches often build on structure-dependent parameters necessitating intractable calibrations, and their formulations are defined on an integration point or a small portion of the structure, thereby precluding general applicability to complicated real-scale RC structures. Here a general confinement model is proposed in a novel way that it can harness physical information inside the real-scale system. The information is denoted nonlocal information, since it is processed by the nonlocal formulation for assuring the mesh-objectivity. Physically, the nonlocal information provides the proximity to adjacent stiff materials and boundaries through the information index suggested herein. Numerical issues regarding the parallel computing and the optimal selection of the length parameter for the nonlocal formulation are also addressed. The unprecedentedly broad applications include a solid column, a hollow column, a rectangular wall, a T-shaped wall, and even a wall with opening, which strongly bear out the promising potential and universality of the novel confinement model.
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Acknowledgments
Regarding experimental data for validation, the kind hospitality of Professor John W. Wallace is appreciated. All numerical simulations were run on GARUDA, a high-performance computing cluster hosted within the Mechanical and Civil Engineering Department at the California Institute of Technology. The purchase and installation of GARUDA was possible thanks to the Ruth Haskell Research Fund, the Tomiyasu Discovery Fund, and Dell Inc. Professor S. Krishnan’s warm support with the cluster is deeply appreciated.
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Information
Published In
Journal of Engineering Mechanics
Volume 140 • Issue 6 • June 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Feb 17, 2013
Accepted: Oct 9, 2013
Published online: Oct 11, 2013
Published in print: Jun 1, 2014
Discussion open until: Jun 23, 2014
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