Skewed bridges collapsed due to unseating of the decks from their support resulted from rotation of the decks around the vertical axis in past earthquakes. Skewed bridges show very unique structural response as a result of poundings of the decks to the substructures and the effect of restrainers. This paper clarifies the mechanism of rotations of skewed bridges and shows the effectiveness of cable restrainers on the mitigation of the rotations. Three configurations of cable restrainers are clarified here: 1) cable restrainers in the weak axis, 2) cable restrainers in the longitudinal direction, and 3) cable restrainers crossing the ends of adjacent decks. It is found that the cross cable restrainers are effective on the mitigation of the rotation of skewed bridges.
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