An Exploratory Study of FRP SeismicRestrainers Subjected to Dynamic Loads


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Title: An Exploratory Study of FRP SeismicRestrainers Subjected to Dynamic Loads

Author(s): M. Saiidi, R. Johnson, and E. Maragakis

Publication: Special Publication

Volume: 230


Appears on pages(s): 57-76

Keywords: dynamic tests; fiber-reinforced polymer; FRP/concretebond; FRP restrainers; restrainer design method; strain rate

Date: 10/1/2005

Glass, carbon, and hybrid (glass/carbon) fabric reinforced polymer (FRP)restrainers were developed and tested as an alternative to steel restrainers to reducebridge hinge movement during earthquakes. The FRP bridge restrainers weredynamically tested on a representative in-span hinge, in the large-scale structureslaboratory at the University of Nevada, Reno (UNR). Work included: (1) Strain rate testson both FRP strips and FRP/concrete bond; (2) FRP restrainer development and testing;(3) Comparisons between FRP, steel, and shape memory alloy (SMA) restrainers; (4)Development and evaluation of a simple restrainer design method. Findings confirm thepotential use of FRP restrainers as a viable option to steel as a restraining device forbridges. Results include: (1) FRP strength is strain-rate insensitive; (2) FRP/concretebond strength is a function of concrete shear strength and is strain-rate sensitive; (3)FRP restrainers are easily constructed and installed; (4) A proposed restrainer designmethod that considers the bridge structure dynamic characteristics is demonstrated tobe both simple and realistic.