Rigid-Body Motion of Horizontally Curved Bridges Subjected to Earthquake-Induced Pounding
Publication: Journal of Bridge Engineering
Volume 21, Issue 12
Abstract
Horizontally curved bridges have been observed to suffer severe structural damage during past earthquakes. Unseating of the deck from abutments is one of the typical modes of failure of horizontal curved bridges. This type of failure is caused primarily because of excessive in-plane rigid-body motion of decks of these bridges, mainly due to the irregular geometry of the bridge itself and seismic pounding between the deck and abutments. This paper investigates the influence of seismic pounding on rigid-body motion of horizontally curved bridges during strong earthquakes using an analytical approach. For this purpose, a 3-degree-of-freedom nonlinear model has been developed to capture main dynamic parameters affecting seismic response of horizontally curved bridges. The accuracy of this model has been verified by finite-element modeling of a typical horizontal curved bridge. An extensive parametric analysis has been performed by varying key parameters, including the size of the gap between the deck and abutments, the subtended angle of the deck, and the presence of friction. Numerical results show that in-plane response quantities of horizontally curved bridges, such as radial and azimuthal displacements of corners of the deck and rotation of the deck about the mass center, are affected noticeably because of seismic pounding. Validity and reasonableness of seismic design guideline recommendations for regular curved bridges in the presence of seismic pounding have also been investigated.
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Published In
Journal of Bridge Engineering
Volume 21 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Dec 7, 2015
Accepted: May 18, 2016
Published online: Jul 13, 2016
Published in print: Dec 1, 2016
Discussion open until: Dec 13, 2016
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