Ductile Seismic Retrofit of Steel Deck-Truss Bridges. I: Strategy and Modeling
Publication: Journal of Structural Engineering
Volume 124, Issue 11
Abstract
Most deck-truss bridges have been designed and constructed without seismic resistance considerations; as a result, their members, connections, and frequently their substructure are not sized and detailed to provide the ductile response needed during major earthquakes. A ductile seismic retrofit solution proposed here consists of converting the deck slab into a composite slab and replacing the end cross-frames and the lower lateral braced panels adjacent to the supports by special ductile diaphragms, thus creating ductile fuses to protect the remaining superstructure and substructure. This paper illustrates the typical seismic vulnerability of such bridges, presents a model governing transverse seismic response of retrofitted deck-trusses, and a methodology to determine overall stiffness and strength of such ductile panels based on developed seismic performance goals. The results of computer simulations for a retrofitted deck-truss subjected to severe ground excitation validates the proposed methodology and the global modeling. It is concluded that the proposed ductile retrofit solution can significantly enhance seismic performance of deck-trusses.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 124 • Issue 11 • November 1998
Pages: 1253 - 1262
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Nov 1, 1998
Published in print: Nov 1998
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