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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Seismic Performance and Retrofitting of Steel Bearings
Author(s): J. B. Mander, D. K. Kim, and S. S. Chen
Publication: Special Publication
Appears on pages(s): 323-336
Keywords: anchor bolts; bridge bearings; earthquake-resistant structures; elastic analysis; reinforced concretes; Structural Research
Abstract:The seismic performance of high type steel bridge bearings of both the fixed and expansion/rocker type were investigated. Simple seismic retrofit strategies were proposed and investigated experimentally. It was shown that by retrofitting existing high type steel bridge bearings, it is possible to provide sufficient strength and displacement capability to withstand substantial ground shaking. The weak link in the chain of force transmission may thus become the anchor bolts and/or the reinforced concrete pedestal. To understand the influence of the reinforced concrete pedestal and mild steel anchorage on the overall behavior of a high type fixed bearing assembly, a full scale reinforced concrete cap beam with pedestals was constructed. The rest results demonstrate the importance of considering the flexibility and strength of the concrete pedestal-anchor bolt system. As a retrofit method for the damaged reinforced concrete pedestal, a steel jacketing retrofit wrapped around the damaged reinforced concrete pedestal and bearing was investigated. Once retrofitted, it is shown that essentially elastic behavior may be expected in an earthquake.
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