Laboratory-Scale Experimental Setup for Studying Cable Dampers
Publication: Journal of Engineering Mechanics
Volume 141, Issue 5
Abstract
This study proposes a laboratory-scale experimental setup that simulates the dynamics of a full-scale stay cable with a transverse damper, allowing the full-scale performance of different types of dampers to be evaluated and compared in a laboratory setting. This test scheme resembles hybrid testing in that it retains the physical structural component for experiments, whereas it uses an equivalent model to represent the large-scale main structure instead of the numerical simulation used in a hybrid test. For the cable, a feasible model is presented that is composed of two flexible beams that are suspended vertically, fixed at their upper ends, and connected at their lower ends by a rigid mass; the damper is attached transversely to one of the beams. The setup is modeled as tensioned beams for clamped-guided supports with a terminal mass and an intermediate damper for dynamic analysis, and the characteristic equation is formulated from dynamic-stiffness matrices of beam segments. Modal properties of the setup are found to be similar to those of a cable-damper system, based on which the equivalence conditions are presented. The established equivalence between a cable and a model is further found to be roughly independent of damper properties for practical applications, therefore ascertaining the potential of this setup for a cable-damper study. Experiments have also been conducted in which the damper performance is evaluated on a full-scale cable and on a beam-mass assembly designed to represent the first vibration mode of the stay cable. The amplitude-dependent damping ratios achieved in the laboratory setting are found to be comparable to those achieved for the full-scale cable, suggesting the applicability and effectiveness of this experimental setup.
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Acknowledgments
This study was partially supported by the National High-Tech Research and Development (R&D) Program of China (863 Program) under Grant No. 2006AA11Z120 and the Independent Research Funds of State Key Laboratory for Disaster Reduction in Civil Engineering of China under Grant No. SLDRCE08-A-05. The authors acknowledge Fangwei Huang, Liuzhou OVM Machinery, and Yan Liu and Jiangyun Liu, former graduate students in the Department of Bridge Engineering, Tongji University, for their cooperation and help during the experiments. The anonymous reviewers’ comments for the improvement of the manuscript are also gratefully acknowledged.
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Published In
Journal of Engineering Mechanics
Volume 141 • Issue 5 • May 2015
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© 2014 American Society of Civil Engineers.
History
Received: Feb 25, 2013
Accepted: Sep 8, 2014
Published online: Oct 10, 2014
Published in print: May 1, 2015
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