EFFECTIVENESS OF CABLE-RESTRAINER FOR MITIGATINGROTATION OF A SKEWED BRIDGE SUBJECTED TO STRONGGROUND SHAKING

摘要

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