| 摘要 |
PROBLEM TO BE SOLVED: To provide a bridge structure offering high load bearing performance at a time of earthquake.SOLUTION: A bridge structure 200 offers excellent load bearing performance at a time of earthquake. When a yielding fuse member 30 of the bridge structure is destroyed by an earthquake causing seismic ground motion L2 of a magnitude exceeding a prescribed limit, the bridge structure transforms itself into a flexible structure thereby elongating a natural frequency of the structure. This is accomplished as an elastic member 40 of the bridge structure undergoes elastic deformation, which in turn prevents excessive displacement of a core column 10 and a cylindrical outer column 20, thereby preventing a damage to the bridge structure 200. Especially, generation of bending moment at the cylindrical outer column 20 is suppressed because upper parts of the cylindrical outer columns 20 are connected by a beam member 50, when the yielding fuse member 30 of the bridge structure 200 is destroyed and the cylindrical outer column is separated from the core column 10. Thus, a damage caused by excessive displacement of the cylindrical outer column 20 may be prevented.SELECTED DRAWING: Figure 9 |
