An integrated damping and strengthening strategy for performance-based seismic design and retrofit for highway bridges.
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2009-05-01
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Edition:Final.
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Abstract:In this study, a damping-enhanced strengthening (DES) strategy was introduced to retrofit bridge structures for multiple
performance objectives. The main objectives of this study are (1) to numerically demonstrate the effectiveness of the anchoring
mechanism of a constrained damping layer in the proposed DES system, and (2) to evaluate the performances of a highway bridge
retrofitted with a DES retrofit technique of viscoelastic (VE) damping and carbon-fiber-reinforced-polymer (CFRP) strengthening
components that are nearly independent under weak earthquakes but strongly coupled under strong earthquakes. The effects of
various constrained surface damping layers on the responses of simply-supported beams and cantilevered columns were first
investigated analytically. An emphasis was then placed on the development of a finite element modeling technique to simulate the
effect of a distributed VE damping layer on the responses of columns. Finally, the DES strategy was applied to retrofit the Old St.
Francis River Bridge columns. Both operational and safety performance objectives of the bridges were evaluated with pushover
analyses under earthquakes of various magnitudes. An anchored constrained damping layer was found several times more
effective than a conventional constrained layer, particularly when covering 20-80% of the column height. To meet the two
performance objectives, the Old St. Francis River Bridge columns must be wrapped with three plies of CFRP sheets and one VE
layer. The new retrofit strategy is well suited in the context of next-generation performance-based seismic design and retrofit of
highway bridges and other structures.
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