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Restrain of a seismically isolated bridge by external stoppers
Authors:Stergios A Mitoulis  Ioannis A Tegos
Institution:(1) Kal Krishnan Consulting Services, Inc., 300 Lakeside Drive, Ste. 220, Oakland, CA 94612, USA;(2) Department of Mechanical Engineering & Engineering Science, University of North Carolina at Charlotte, Charlotte, NC 28223, USA;(3) Ove Arup & Partners Hong Kong Ltd, Level 5 Festival Walk, 80 Tat Chee Avenue, Kowloon Tang, Kowloon, Hong Kong, Peoples’ Republic of China
Abstract:The current design of seismically isolated bridges usually combines the use of bearings and stoppers, as a second line of defence. The stoppers allow the development of the in-service movements of the bridge deck, without transmitting significant loads to the piers and their foundations, while during earthquake they transmit the entire seismic action. Despite the fact that stoppers, which restrain the transverse seismic movements of the deck, are used frequently in seismically isolated bridges, the use of longitudinal stoppers is relatively rare, mainly due to the large in-service constraint movements of bridges. The present paper proposes a new type of external longitudinal stoppers, which are installed in stiff sub-structures-boundaries, aiming at limiting the bridge seismic movements. The parametric investigation, which was conducted in order to identify the seismic efficiency of the external stoppers, showed that the interaction of the bridge with the stiff boundaries can lead to significant reductions in the seismic movements of the bridge. Serviceability is appropriately arranged in the paper by expansion joints and approach slabs.
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