AERODYNAMIC DAMPING DEVICE FOR BOX GIRDER BRIDGE WITH FLOOR-SLAB OVERHANG

摘要

PROBLEM TO BE SOLVED: To provide an aerodynamic damping device for a box girder bridge, in which aerodynamic unstable vibrations generated in the box girder bridge with a floor-slab overhang, particularly a galloping as a kind of divergent vibrations dangerous to the bridge is used as an object to be inhibited, and maintenance inspection such as maintenance is not required and the weight of a metal is lowered by the reduction of wind load and which has the improved type shape of a box girder section considered to the landscape of the whole bridge and is formed in a design and can be utilized for a structural member. ;SOLUTION: An aerodynamic damping device 11 for the box girder bridge 10 with the floor-slab overhang has a box girder section 12 extended in the bridge axial direction and a floor slab section 3 overhung onto the top face of the box girder section 12 and the left and right of the top face of the box girder section 12, aiming at the installation of a corner-section forming section (a corner cut member 13 or a corner-notched member or the like) having a specified sectional shape to a box girder section 12 body. The corner-section forming section 13, in which a relative angle θ extends over 25-45°, is formed to the underside 12A of the box girder section 12 at that time.;COPYRIGHT: (C)1999,JPO