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18 May 1999 Seismic mitigation of bridges using smart restrainers
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Recent earthquakes in the US and Japan have highlighted the vulnerability of bridges to collapse due to excessive movement at the hinges as a result of bearing and restrainer failure. Conventional hinge restrainers used in the US and Japan do not provide adequate protection from unseating, which can lead to collapse of bridges. This paper investigates the efficacy of using 'smart restrainers' to reduce the seismic vulnerability of bridges. The use of shape memory alloy devices as replacements for conventional restrainers are investigated as a method of improving the seismic response of bridges. Analytical studies show that these deices, used as passive dampers, are effective in both limiting the relative displacement between frames, and reducing the negative effects of pounding of bridge decks. In addition, by concentrating damage and energy dissipation in controlled locations, these devices can be used to reduce the demand on individual frames in multiple-frame bridges. Comparisons with conventional restrainers show that the 'smart restrainers' are more effective for a wide range of ground motions and bridge types than current restrainers.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Reginald DesRoches "Seismic mitigation of bridges using smart restrainers", Proc. SPIE 3671, Smart Structures and Materials 1999: Smart Systems for Bridges, Structures, and Highways, (18 May 1999);

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