Dynamic Anomalies in a Modular Bridge Expansion Joint
Publication: Journal of Bridge Engineering
Volume 11, Issue 5
Abstract
Environmental noise complaints from homeowners near bridges with modular bridge expansion joints (MBEJs) led to an engineering investigation into the noise production mechanism. The investigation identified modal vibration frequencies in the MBEJ coupling with acoustic resonances in the chamber cast into the bridge abutment below the MBEJ. This initial acoustic investigation was soon overtaken by observations of fatigue induced cracking in structural beams transverse to the direction of traffic. These beams are, in the English-speaking world, universally referred to as center beams. However, in Europe the term lamellae is equally common. A literature search revealed little to describe the structural dynamics behavior of MBEJs but showed that there was an accepted belief dating from around 1973 that the loading was dynamic. In spite of this knowledge many bridge design codes used throughout the world specify a static or quasi-static load case with no mention of the dynamic behavior. This paper identifies the natural modes and operational response modes of vibration of the MBEJ installed into Sydney’s Anzac Bridge. In addition, the paper will introduce the dynamic range factor (DRF) and report a DRF of 4.6 obtained after extensive static and dynamic strain gage measurements. The studies indicated that the Anzac Bridge MBEJ was very lightly damped ( of critical) and a reduction in the measured DRF through the introduction of additional damping was an option.
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Acknowledgment
The writers wish to thank the Chief Executive of the Roads and Traffic Authority of NSW (RTA) for permission to publish this paper. The opinions and conclusions expressed in this paper do not necessarily reflect the views of the RTA.
References
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 11 • Issue 5 • September 2006
Pages: 541 - 554
Copyright
© 2006 American Society of Civil Engineers.
History
Received: Oct 28, 2003
Accepted: Jun 14, 2005
Published online: Sep 1, 2006
Published in print: Sep 2006
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