Implementation of Effective Force Testing for Nonlinear Structures
Publication: Journal of Structural Engineering
Volume 144, Issue 10
Abstract
Effective force testing (EFT) is a dynamic testing method that can consider the rate-dependent behavior of a structure. Because of the lack of knowledge of real-time force control for a servohydraulic actuator, however, EFT has seldom been used within the testing community. Recent advances in force control enable the force application to nonlinear structures in real-time and effectively resolve the natural velocity feedback issue of servohydraulic actuators. With the aid of the new real-time force control method, this paper demonstrates EFT conducted for a small-scale nonlinear concrete mass block system combined with a rubber bearing and a frictional slider, which was a challenging task to implement with the previous knowledge of EFT. This study uses two different earthquake ground motions with different frequency contents for the EFT. The accuracy of the applied effective force is evaluated by comparing the time domain data and the response spectra. In addition, a nonlinear numerical model for the test structure is constructed and used for numerical simulation to compare its result with the EFT result. Overall, satisfactory results are obtained, which show that this study successfully conducted the EFT.
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Acknowledgments
This paper is partly based upon work supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) under Grant Number 15CTAP-B067472-03 and partly supported by startup funds from Old Dominion University. The authors greatly appreciate the generous support of the sponsors.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 144 • Issue 10 • October 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Oct 27, 2017
Accepted: May 1, 2018
Published online: Jul 31, 2018
Published in print: Oct 1, 2018
Discussion open until: Dec 31, 2018
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